PLAINS RESOURCES INC
SC 13D, 1997-11-21
PETROLEUM & PETROLEUM PRODUCTS (NO BULK STATIONS)
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<PAGE>   1

                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13D


                   UNDER THE SECURITIES EXCHANGE ACT OF 1934



                            Plains Resources Inc.
- --------------------------------------------------------------------------------
                              (Name of Issuer)

                        Common Stock, $.10 par value
- --------------------------------------------------------------------------------
                       (Title of Class of Securities)

                                  726540 50 6
                              --------------------
                                 (CUSIP Number)

                      J.B. Edrington, Corporate Secretary
                               Shell Oil Company
                              910 Louisiana Street
                              Houston, Texas 77252
                               (713) 241-6161
- --------------------------------------------------------------------------------
(Name, Address and Telephone Number of Person Authorized to Receive Notices and
                                Communications)

                              November 12, 1997
- --------------------------------------------------------------------------------
           (Date of Event which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [ ].

NOTE:  Six copies of this statement, including all exhibits, should be filed
with the Commission.  See Rule 13d-1(a) for other parties to whom copies are to
be sent.

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities,
and for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).
<PAGE>   2
                                 SCHEDULE 13D

CUSIP NO. 726540 50 6                               



- --------------------------------------------------------------------------------
 1    NAME OF REPORTING PERSON
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON


      Shell Land & Energy Company
- --------------------------------------------------------------------------------
 2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP       
                                                                        (a) [ ]
                                                                        (b) [ ]
      N/A
- --------------------------------------------------------------------------------
 3    SEC USE ONLY



- --------------------------------------------------------------------------------
 4    SOURCE OF FUNDS


      OO
- --------------------------------------------------------------------------------
 5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
      ITEMS 2(d) or 2(e)                                                    [ ]



- --------------------------------------------------------------------------------
 6    CITIZENSHIP OR PLACE OF ORGANIZATION


      Delaware
- --------------------------------------------------------------------------------
                               7     SOLE VOTING POWER

          NUMBER OF            
                                     -0-
           SHARES              -------------------------------------------------
                               8     SHARED VOTING POWER                        
        BENEFICIALLY           
                               
          OWNED BY                   1,082,000
                               ------------------------------------------------
            EACH               9     SOLE DISPOSITIVE POWER
                    
          REPORTING 
                                     -0-
           PERSON              ------------------------------------------------
                               10    SHARED DISPOSITIVE POWER                  
            WITH    
                               
                                     1,082,000
- ------------------------------------------------------------------------------- 
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


      1,082,000
- --------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
                                                                            [ ]



- --------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)


      6.1
- --------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON


      CO      
- --------------------------------------------------------------------------------

<PAGE>   3
                                 SCHEDULE 13D

CUSIP NO. 726540 50 6



- --------------------------------------------------------------------------------
 1    NAME OF REPORTING PERSON
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON


      Shell Oil Company
- --------------------------------------------------------------------------------
 2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                        (a) [ ]
                                                                        (b) [ ]
      N/A
- --------------------------------------------------------------------------------
 3    SEC USE ONLY



- --------------------------------------------------------------------------------
 4    SOURCE OF FUNDS


      AF
- --------------------------------------------------------------------------------
 5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
      ITEMS 2(d) or 2(e)                                                    [ ]



- --------------------------------------------------------------------------------
 6    CITIZENSHIP OR PLACE OF ORGANIZATION


      Delaware
- --------------------------------------------------------------------------------
                               7     SOLE VOTING POWER

          NUMBER OF            
                                     -0-
           SHARES              -------------------------------------------------
                               8     SHARED VOTING POWER                        
        BENEFICIALLY           
                               
          OWNED BY                   1,082,000
                               ------------------------------------------------
            EACH               9     SOLE DISPOSITIVE POWER
                    
          REPORTING 
                                     -0-
           PERSON              ------------------------------------------------
                               10    SHARED DISPOSITIVE POWER                  
            WITH    
                               
                                     1,082,000
- ------------------------------------------------------------------------------- 
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


      1,082,000
- --------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
                                                                            [ ]



- --------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)


      6.1
- --------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON


      CO      
- --------------------------------------------------------------------------------

                                     -2-

<PAGE>   4
ITEM 1.  SECURITY AND ISSUER.

         This statement relates to the common stock, $.10 par value (the
"Common Stock"), of Plains Resources Inc., a Delaware corporation (the
"Issuer").  The address of the principal executive offices of the Issuer is
1600 Smith Street, Houston, Texas 77002.

ITEM 2.  IDENTITY AND BACKGROUND.

         This statement is being filed by Shell Land & Energy Company, a
Delaware corporation ("SLEC"), and by Shell Oil Company, a Delaware corporation
("Shell").  Shell is wholly-owned by Shell Petroleum Inc., a Delaware
corporation, whose shares are directly or indirectly owned 60% by Royal Dutch
Petroleum Company, The Hague, The Netherlands, and 40% by The "Shell" Transport
and Trading Company, p.l.c., London, England.  Royal Dutch Petroleum Company
and The "Shell" Transport and Trading Company, p.l.c., are holding companies
which together directly or indirectly own securities of companies of the Royal
Dutch/Shell Group of Companies, the members of which are severally engaged
throughout the greater part of the world in oil, natural gas, chemicals, coal
and other businesses.

         Shell and its subsidiaries are engaged, principally in the United
States in the exploration for, and development, production, purchase,
transportation and marketing of, crude oil and natural gas, and the purchase,
manufacture, transportation and marketing of oil and chemical products.  In
addition, Shell and its subsidiaries are engaged in the exploration for, and
production of, crude oil and natural gas outside the United States.  Also Shell
and its subsidiaries are engaged in the development, production and marketing
of sulfur and carbon dioxide.  SLEC is an indirect subsidiary of Shell and is
engaged primarily in the business of  the exploration and production of oil.
SLEC and Shell are referred to herein as the "Reporting Entities."





                                      -3-
<PAGE>   5
         The address of the principal business and the principal office of SLEC
and Shell is One Shell Plaza, Houston, Texas  77002.  Schedule I attached
hereto sets forth certain additional information with respect to each director
and each executive officer of SLEC and Shell.  The filing of this statement on
Schedule 13D shall not be construed as an admission that Shell or SLEC or any
person listed on Schedule I hereto is, for the purposes of Section 13(d) or
13(g) of the Securities Exchange Act of 1934, the beneficial owner of any
securities covered by this statement.

         Neither of the Reporting Entities nor, to their knowledge, any person
listed on Schedule I hereto, has been, during the last five years (i) convicted
in a criminal proceeding (excluding traffic violations or similar misdemeanors)
or (ii) a party to a civil proceeding and as a result of such proceeding was or
is subject to a judgment, decree or final order enjoining future violation of,
or prohibiting or mandating activities subject to, U.S. federal or state
securities laws or finding any violation with respect to such laws.

ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

         Under the terms of an Exchange Agreement executed November 12, 1997,
between SLEC, Shell Western E&P Inc. and the Issuer (the "Exchange Agreement"),
SLEC obtained from the Issuer in connection with an exchange of property the
following securities: (a) 46,600 shares of Series D Cumulative Convertible
Preferred Stock (initially convertible into an aggregate of 932,000 shares of
Common Stock) (the "Preferred Stock"); and (b) a Warrant to purchase 150,000
shares of Common Stock (collectively, the "Securities").  SLEC acquired the
Securities through an exchange of certain exploration and production property
owned by SLEC and Shell Western E&P Inc., an indirect subsidiary of Shell, for
(i) the Issuer's rights under a certain participation agreement involving an
oil and gas lease and (ii) the Securities.





                                      -4-
<PAGE>   6
ITEM 4.  PURPOSE OF TRANSACTION.

         The transaction described in Item 3 above occurred as a result of
negotiations with the Issuer.  The Securities purchased by SLEC were acquired
in connection with the property exchange described above and for investment
purposes.  SLEC intends to review its investment in the Issuer on an ongoing
basis and, depending upon the price of, and other market conditions relating
to, the Common Stock, subsequent developments affecting the Issuer, the
Issuer's business and prospects, other investment and business opportunities
available to SLEC, general stock market and economic conditions, tax
considerations and other factors deemed relevant, may decide to increase or
decrease the size of its investment in the Issuer.

         Other than as described above, neither of the Reporting Entities, nor,
to their knowledge, any person listed on Schedule I hereto, has any plan or
proposal that would result in any of the consequences listed in paragraphs 
(a) - (j) of Item 4 of Schedule 13D.

ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER.

         SLEC beneficially owns and has the power to vote and dispose of
1,082,000 shares of Common Stock, representing approximately 6.1% of the shares
of Common Stock outstanding (determined in accordance with Rule 13d-3).
Because SLEC is an indirect  subsidiary of Shell, Shell may also be deemed to
beneficially own such shares.  Of these 1,082,000 shares, (a) 150,000 are
issuable on exercise of the Warrant and, (b) 932,000 are issuable on the
conversion of the 46,600 shares of Preferred Stock.  The number of shares of
Common Stock issuable upon conversion or exercise of the Warrant and the
Preferred Stock is subject to adjustment pursuant to customary antidilution
provisions included in the terms of such Securities.   The rights and
preferences of the Preferred Stock are set forth in the Issuer's Certificate of
Designation.





                                      -5-
<PAGE>   7
         Except as described herein, neither of the Reporting Entities, nor, to
their knowledge, any of the persons named in Schedule I hereto, has effected
any transactions in the Common Stock during the past sixty days.

ITEM 6.  CONTRACTS,  ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH
         RESPECT TO SECURITIES OF THE ISSUER.

         Upon the execution and closing of the Exchange Agreement pursuant to
which the Securities were acquired, the Issuer and SLEC entered into a Service
Agreement obligating SLEC to provide consulting services for a period of sixty
days commencing November 12, 1997 unless earlier terminated by the Issuer to
help familiarize the Issuer with the personnel and facilities and operation of
certain properties exchanged by SLEC pursuant to the terms of the Exchange
Agreement.  SLEC is entitled to a fee for its services in an amount equal to a
sum equivalent to the salary and wages paid by SLEC to the personnel performing
the services, plus an amount equal to 33% of such salary and wages to cover
payroll taxes, workers compensation expenses and pension and benefits expenses
with respect to such personnel.  SLEC shall provide a statement setting forth
the amount due for the services within sixty days of termination of the Service
Agreement.

         In addition, Exhibit A-3 of the Exchange Agreement, filed as Exhibit 6
hereto (the "Registration Rights Agreement"), provides SLEC certain
registration rights relating to the underlying Common Stock of the Issuer
received upon conversion of the Preferred Stock and the exercise of the
Warrants.  Pursuant to the Registration Rights Agreement, the Issuer is
obligated to prepare and file as promptly as practicable, but in any event,
within 90 days of November 10, 1997, with the Securities and Exchange
Commission a shelf registration statement pursuant to Rule 415 of the
Securities Act of 1933, as amended, with respect to the shares of Preferred
Stock and the shares of Common Stock into which the Preferred Stock is
convertible; and (ii) a shelf registration statement pursuant to Rule 415 of
the Securities Act of 1933, as amended, with respect to the 150,000 shares of
Common Stock to be received upon exercise of the Warrants.





                                      -6-
<PAGE>   8
ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS

         Exhibit 1   -    Agreement that the Schedule 13D is filed on behalf of
                          each reporting person.

         Exhibit 2   -    Certificate of Designation for 46,600 shares of
                          Series D Cumulative Convertible Preferred Stock of
                          the Issuer.

         Exhibit 3   -    Warrant to purchase 150,000 shares of Common Stock.

         Exhibit 4   -    Service Agreement dated November 12, 1997, between
                          SLEC, Shell Western E&P Inc. and the Issuer.

         Exhibit 5   -    Exchange Agreement dated as of November 12, 1997
                          between the Issuer, SLEC and Shell Western E&P Inc.

         Exhibit 6   -    Registration Rights Agreement included at Exhibit A-3
                          of the Exchange Agreement.





                                      -7-
<PAGE>   9
                                   SIGNATURE

         After reasonable inquiry and to the best knowledge and belief of the
undersigned, the undersigned certify that the information set forth in this
statement is true, complete and correct.  November 21, 1997

                                       SHELL LAND & ENERGY COMPANY
                                       
                                       
                                                                             
                                       By: /s/ Jack E. Little       
                                          -----------------------------------
                                       Name:   Jack E. Little                
                                            ---------------------------------
                                       Title:  President                     
                                             --------------------------------
                                                                             
                                                                             
                                       SHELL OIL COMPANY                     
                                                                             
                                                                             
                                                                             
                                       By: /s/ Jack E. Little                
                                          -----------------------------------
                                       Name:   Jack E. Little                
                                            ---------------------------------
                                       Title:  Executive Vice President      
                                             --------------------------------
                                                                             
                                       

                                      -8-
<PAGE>   10
                                                                      SCHEDULE I

                        DIRECTORS AND EXECUTIVE OFFICERS
                          SHELL LAND & ENERGY COMPANY


<TABLE>
<CAPTION>
NAME AND BUSINESS ADDRESS              CITIZENSHIP                             POSITION AND OCCUPATION     
<S>                                    <C>                                     <C>                         
Jack E. Little                         U.S.A.                                  Director/Chairman, President
910 Louisiana Street                                                                                       
Houston, Texas 77252                                                                                       
                                                                                                           
L. Z. Cook                             U.S.A.                                  Director, Vice President    
910 Louisiana Street                                                                                       
Houston, Texas 77252                                                                                       

D. W. Strebel                          U.S.A.                                  Vice President Tax          
910 Louisiana Street                                                                                       
Houston, Texas 77252                        
                                            
</TABLE>                                    
                             



                                      -9-
<PAGE>   11
                        DIRECTORS AND EXECUTIVE OFFICERS
                               SHELL OIL COMPANY

<TABLE>
<CAPTION>
NAME AND BUSINESS ADDRESS              CITIZENSHIP                             POSITION AND OCCUPATION          
<S>                                    <C>                                     <C>                              
C.A.J. Herkstroter                     Netherlands                             Chairman                         
Carel van Bylandtlaan 30                                                       President and Managing Director, 
2596 HR The Hague                                                              Royal Dutch Petroleum Company    
The Netherlands                                                                                                 
                                                                                                                
Joseph E. Antonini                     U.S.A.                                  Director                         
1800 W. Maple Road                                                             Retired Chairman, President and  
Troy, Michigan 48084                                                           CEO, KMart Corporation           

Rand V. Araskog                        U.S.A.                                  Director                         
1330 Avenue of the Americas                                                    Chairman and CEO                 
New York, New York 10019-5490                                                  ITT Corporation                  
                                                                                                                
Philip J. Carroll                      U.S.A.                                  Director, President, Chief       
910 Louisiana Street                                                           Executive Officer                
Houston, Texas 77252                                                                                            
                                                                                                                
Robert F. Daniell                      U.S.A.                                  Director                         
United Technologies Bldg.                                                      Retired Chairman, United         
Hartford, Connecticut 06101                                                    Technologies Corporation         
                                                                                                                
Jack E. Little                         U.S.A.                                  Director, Executive Vice         
910 Louisiana Street                                                           President                        
Houston, Texas 77252                                                                                            

Vilma S. Martinez                      U.S.A.                                  Director                         
355 S. Grand Avenue                                                            Attorney (Partner)               
Los Angeles, California 90071-1560                                             Munger, Tolles & Olson           
                                                                                                                
Mark Moody-Stuart                      England                                 Director                         
Shell Centre                                                                   Chairman and Managing Director   
2 York Road                                                                    The "Shell" Transport and Trading
London SEI 7NA                                                                 Company p.l.c.                   
England                                                                                                         
                                                                                                                
Harold A. Poling                       U.S.A.                                  Director Emeritus                
Regent Court Bldg.                                                             Retired Chairman and CEO, Ford   
16800 Executive Place Drive                                                    Motor Company                    
Dearborn, Michigan  48126                                                                                       
                                                                                                                
Gordon R. Sullivan                     U.S.A.                                  Director                         
490 L'Enfont Plaza, S.W.                                                       President                        
Washington, D.C. 20024                                                         Coleman Federal                  

John F. Woodhouse                      U.S.A.                                  Director                         
1390 Enclave Parkway                                                           Chairman                         
Houston, Texas 77077-2099                                                      Sysco Corporation                
                                                                                                                
J. M. Morgan                           U.S.A.                                  Senior Vice President - Oil      
910 Louisiana Street                                                           Products                         
Houston, Texas 77252                                                                                            
                                                                                                                
</TABLE>                                         
                                                 



                                      -10-
<PAGE>   12
<TABLE>
<CAPTION>
NAME AND BUSINESS ADDRESS              CITIZENSHIP                             POSITION AND OCCUPATION         
<S>                                    <C>                                     <C>                             
J. P. Parrish                          U.S.A.                                  Senior Vice President - Services
910 Louisiana Street                                                                                           
Houston, Texas 77252                                                                                           
                                                                                                               
L. E. Sloan                            U.S.A.                                  Senior Vice President - Chemical
910 Louisiana Street                                                                                           
Houston, Texas 77252                                                                                           

D. Gardy                               France                                  Vice President - Finance        
910 Louisiana Street                                                                                           
Houston, Texas 77252                                                                                           
                                                                                                               
S. A. Lackey                           U.S.A.                                  Vice President and General      
910 Louisiana Street                                                           Counsel                         
Houston, Texas 77252                                                                                           
                                                                                                               
B. W. Levan                            U.S.A.                                  Vice President - Human Resources
910 Louisiana Street                                                                                           
Houston, Texas 77252                                                                                           
                                                                                                               
S. C. Stryker                          U.S.A.                                  Vice President and General Tax  
910 Louisiana Street                                                           Counsel                         
Houston, Texas 77252                                                                                           

S. E. Ward                             U.S.A.                                  Vice President - Government     
1401 Eye Street, N.W., Suite 1030                                              Affairs                         
Washington, D.C. 20005                                                                                         
                                                                                                               
</TABLE>




                                      -11-
<PAGE>   13
                               INDEX TO EXHIBITS

         Exhibit 1   -    Agreement that the Schedule 13D is filed on behalf of
                          each reporting person.

         Exhibit 2   -    Certificate of Designation for 46,600 shares of
                          Series D Cumulative Convertible Preferred Stock of
                          the Issuer.

         Exhibit 3   -    Warrant to purchase 150,000 shares of Common Stock.

         Exhibit 4   -    Service Agreement dated November 12, 1997, between
                          SLEC, Shell Western E&P Inc. and the Issuer.

         Exhibit 5   -    Exchange Agreement dated as of November 12, 1997
                          between the Issuer, SLEC and Shell Western E&P Inc.

         Exhibit 6   -    Registration Rights Agreement included at Exhibit A-3
                          of the Exchange Agreement.





                                      

<PAGE>   1
                                   Exhibit 1

                                   AGREEMENT

The undersigned reporting persons hereby agree that the statements filed
pursuant to this Schedule 13D dated November 21, 1997, to which this Agreement
are filed as an exhibit, are filed on behalf of each of them.

                                        SHELL LAND & ENERGY COMPANY



                                        By: /s/ JACK E. LITTLE
                                           ---------------------------------
                                           Name: Jack E. Little
                                           Title: President


                                        SHELL OIL COMPANY



                                        By: /s/ JACK E. LITTLE
                                           ---------------------------------
                                           Name: Jack E. Little
                                           Title: Executive Vice President



<PAGE>   1
                                                                      EXHIBIT 2

                             PLAINS RESOURCES INC.



                Certificate of Designation, Preferences and 
                Rights of a Series of Preferred Stock by 
                Resolution of the Board of Directors Providing 
                for an Issue of 46,600 Shares of Preferred Stock 
                Designated Series D Cumulative Convertible 
                Preferred Stock

         Plains Resources Inc., a Delaware corporation (hereinafter called the
"Company"), pursuant to the provisions of Section 151 of the General
Corporation Law of the State of Delaware, does hereby state and certify that
pursuant to the authority expressly vested in the Board of Directors of the
Company by the Certificate of Incorporation, as amended, the Board of
Directors, at a meeting thereof duly called and held on October 31, 1997, at
which meeting a quorum was present and acting throughout, duly adopted the
following resolutions providing for the issue of shares of Preferred Stock
hereinafter referred to, and further providing with respect to such issue of
shares of Preferred Stock for such powers, designations, preferences and
relative, participating, optional and other special rights, and the
qualifications, limitations or restrictions thereof, as are hereinafter set
forth, in addition to those set forth in said Certificate of Incorporation;

         RESOLVED, that pursuant to Article FOURTH of the Certificate of
Incorporation (which authorizes 2,000,000 shares of Preferred Stock, $1.00 par
value) the Board of Directors hereby provides for the issue of a series of
46,600 shares of Preferred Stock designated "Series D Cumulative Convertible
Preferred Stock"; and

         RESOLVED, that the powers, designations, preferences and relative,
participating, optional and other special rights, and the qualifications,
limitations or restrictions thereof, of the shares of the Series D Cumulative
Convertible Preferred Stock shall be as follows:

         Section 1.  Designation and Rank.  The designation of the series of
Preferred Stock created by this resolution shall be "Series D Cumulative
Convertible Preferred Stock", and the number of shares constituting this Series
shall be 46,600.  Shares of this Series shall have a stated value of $500.00
per share (the "Stated Value").  The number of authorized shares of this Series
may be reduced by further resolution duly adopted by the Board and by the
filing of a certificate pursuant to the provisions of the General Corporation
Law of the State of Delaware stating that such reduction has been so
authorized.  The shares of this Series shall rank prior to the Junior Stock (as
defined in
<PAGE>   2
Section 9) as to distribution of assets and payment of dividends.  The shares
of this Series shall be of equal rank as to distribution of assets and payment
of dividends with all other series of Preferred Stock, except as provided in a
certificate of designation with regard to such other series of Preferred Stock
filed pursuant to Section 151 of the General Corporation Law of the State of
Delaware with the Secretary of State of the State of Delaware.

         SECTION 2.  Dividends.

         (a)      Shares of this Series shall be entitled to receive, when and
as declared by the Board of Directors, a cash dividend at the dividend rate of
six percent per annum (the "Dividend Rate") on the Stated Value per share of
this Series, and no more.  No such dividends shall accrue prior to January 1,
2000.  Commencing January 1, 2000, such dividends shall be cumulative, shall
accrue (whether or not declared and whether or not there shall be funds legally
available for the payment of dividends) from such date and shall be payable in
arrears, out of assets legally available therefor, when and as declared by the
Board of Directors of the Company, on April 1, July 1, October 1, and January 1
of each year, commencing April 1, 2000 (except that if any such date is a
Saturday, Sunday or a legal holiday then such dividend shall be payable without
interest on the next day that is not a Saturday, Sunday or legal holiday) (each
three-month period expiring on a dividend payment date being referred to
herein as a "Dividend Period").  Each of such dividends shall be paid to the
holders of record of shares of this Series as they appear on the stock register
of the Company on such record dates, not exceeding 30 days preceding the
payment dates thereof, as shall be fixed by the Board.  Dividends on account of
arrears for any past Dividend Periods (an "Arrearage") may be declared and paid
at any time, without reference to any regular dividend payment date, to holders
of record on such date, not exceeding 45 days preceding the payment date
thereof, as may be fixed by the Board.

         (b)      At any time while there is an Arrearage on shares of this
Series, such Arrearage shall be exchangeable, in full only, at the option of a
majority in interest of the record holders thereof for shares of fully paid and
nonassessable shares of Common Stock (an "Arrearage Exchange") by presentation
to the Company of a written notice executed by such majority in interest (an
"Exchange Notice") electing to make an Arrearage Exchange.  The number of
shares of Common Stock to be issued and delivered to the holders of shares of
this Series upon an Arrearage Exchange shall be determined by dividing the
total amount of the Arrearage by the Per Share Market Value on the date of the
Company's receipt of the Exchange Notice.  Upon the issuance and mailing of
certificates representing such shares of Common Stock to the record holders of
shares of this Series, such Arrearage shall be canceled and no holder of shares
of this Series shall be entitled to any payment on account thereof.

         (c)      No full dividends shall be declared or paid or set apart for
payment on Parity Stock (as defined in Section 9) or Junior Stock for any
period unless full cumulative dividends have been or contemporaneously are
declared and paid or declared and a sum sufficient for the payment thereof set
apart for such payment on this Series for all Dividend Periods terminating on
or prior to the date
<PAGE>   3
of payment of such full cumulative dividends.  When dividends are not paid in
full, as aforesaid, upon the shares of this Series and of any other series of
Parity Stock, all dividends declared upon shares of this Series and of any
other series of Parity Stock shall be declared pro rata so that the amount of
dividends declared per share on this Series and such other series of Preferred
Stock shall in all cases bear to each other the same ratio that accrued
dividends per share on the shares of this Series and such other series of
Preferred Stock bear to each other.  Holders of shares of this Series shall not
be entitled to any dividend, whether payable in cash, property or stock, in
excess of full cumulative dividends, as herein provided, on this Series.  No
interest, or sum of money in lieu of interest, shall be payable in respect of
any dividend payment or payments on this Series that may be in arrears.

         (d)      So long as any shares of this Series are outstanding, no
dividend (other than a dividend in Junior Stock or other than as provided in
Section 2(c) shall be declared or paid or set aside for payment or other
distribution declared or made upon the Junior Stock, nor shall any Junior Stock
be redeemed, purchased or otherwise acquired for any consideration (or any
moneys be paid to or made available for a sinking fund for the redemption of
any shares of Junior Stock) by the Company (except by conversion into or in
exchange for Junior Stock) unless, in each case, the full cumulative dividends
on all outstanding shares of this Series then payable shall have been paid.

         (e)      Dividends payable on this Series for any period less than a
full Dividend Period shall be computed on the basis of the ratio of the number
of days in such partial period to the actual number of days in such full
Dividend Period.

         SECTION 3.  Redemption.

         (a)      From and after November 12, 1998, the Company, at its option,
may redeem Shares of this Series, as a whole or in part, at any time or from
time to time, at a cash redemption price per share of this Series equal to the
amount of any Arrearage plus

         (i)      the Conversion Price (as defined in Section 6(b) multiplied by

         (ii)     the number of shares of Common Stock into which a share of
this Series is convertible as of the date of such redemption multiplied by

         (iii)    the Agreed Percentage (as defined in Section 9).

         (b)      In the event that fewer than all of the outstanding shares of
this Series are to be redeemed, the number of shares to be redeemed shall be
determined by the Board and the shares to be redeemed shall be determined by
lot or pro rata as may be determined by the Board or by any other method as may
be determined by the Board in its sole discretion to be equitable.

         (c)      At such time as the Company shall redeem shares of this
Series, notice of such redemption shall be given by first class mail, postage
prepaid, mailed not less than 30 days prior to
<PAGE>   4
the redemption date, to each holder of record of the shares to be redeemed, at
such holder's address as the same appears on the stock register of the Company.
Each such notice shall state:  (i) the redemption date; (ii) the number of
shares of this Series to be redeemed and, if fewer than all the shares held by
such holder are to be redeemed, the number of such shares to be redeemed from
such holder; (iii) the redemption price; (iv) the place or places where
certificates for such shares are to be surrendered for payment of the
redemption price; and (v) that dividends on the shares to be redeemed will
cease to accrue on such redemption date.  Prior to the redemption date
specified in such notice, holders of shares of this Series may exercise the
right to convert shares of this Series into shares of Common Stock pursuant to
Section 6 hereof and the right to exchange Arrearage (if any) into shares of
Common Stock pursuant to Section 2(b) hereof.

         (d)      Notice having been mailed as aforesaid, from and after the
redemption date (unless default shall be made by the Company in providing money
for the payment of the redemption price) dividends on the shares of this Series
so called for redemption shall cease to accrue, and said shares shall no longer
be deemed to be outstanding, and all rights of the holders thereof as
stockholders of the Company (except the right to receive from the Company the
redemption price) shall cease.  Upon surrender in accordance with said notice
of the certificates for any shares so redeemed (properly endorsed or assigned
for transfer, if the Board shall so require and the notice shall so state),
such shares shall be redeemed by the Company at the redemption price aforesaid.
In case fewer than all the shares represented by any such certificate are
redeemed, a new certificate shall be issued representing the unredeemed shares
without cost to the holder thereof.

         (e)      Any shares of this Series that shall at any time have been
redeemed or purchased by the Company shall, after such redemption, have the
status of authorized but unissued shares of Preferred Stock, without
designation as to series, until such shares are once more designated as part of
a particular series by the Board.

         SECTION 4.  Voting.

         (a)      Except as otherwise required by law and as specified in this
Section 4, the holders of shares of this Series shall not have any right or
power to vote on any question or in any proceeding or to be represented at or
to receive notice of any meeting of holders of capital stock of the Company.
Holders of shares of this Series shall be entitled to receive all reports filed
by the Company with the Securities and Exchange Commission..  On any matters on
which the holders of shares of this Series shall be entitled to vote, they
shall be entitled to one vote for each share held.

         (b)      So long as any shares of this Series remain outstanding, the
affirmative vote or consent of the holders of a majority of the shares of this
Series outstanding at the time, given in person or by proxy, either in writing
or at a meeting, shall be necessary to permit, effect or validate (i) the
authorization, creation or issuance, or any increase in the authorized or
issued amount, of any class or series of Senior Stock (as defined in Section 9)
and (ii) the amendment, alteration or repeal of any of the provisions of the
Certificate of Incorporation, as amended, which would materially and adversely
affect any right, preference, privilege or voting power of shares
<PAGE>   5
of this Series or of the holders thereof in a manner disproportionate to the
effect thereof on the holders of any other shares of the Company's capital
stock.  However, the creation and issuance of other series of Parity Stock or
Junior Stock shall not be deemed to affect materially and adversely such
rights, preferences or privileges.

         (c)      So long as at least 2,000 shares of this Series remain
outstanding, the holders of shares of this Series outstanding at the time shall
be entitled to vote to permit, effect or validate the authorization of a merger
or consolidation of the Company or any compulsory share exchange pursuant to
which the Common Stock is converted into other securities, cash or property.
The holders of shares of this Series shall be entitled to that number of votes
equal to the aggregate of (i) the number of whole shares of Common Stock into
which all shares of this Series held by such holders could be converted
pursuant to the provisions of Section 6 hereof, plus (ii) the number of shares
for which outstanding Arrearage (if any) may be exchanged pursuant to Section
2(b), at the record date for the determination of the stockholders entitled to
vote on such matters or, if no record date is established, at the day prior to
the date such vote is taken or any written consent of stockholders is first
executed, such votes to be counted together with all other shares of capital
stock having general voting powers and not separately as a class.

         SECTION 5.  Liquidation.  In the event of any complete liquidation,
dissolution or winding-up of the Company, whether voluntary or involuntary, the
holders of shares of this Series shall each be entitled to receive out of the
assets of the Company, whether such assets are capital or surplus, for each
share of this Series a sum equal to the Stated Value plus the amount of any
accrued and unpaid dividends on such share before any distribution shall be
made to the holders of Junior Stock of the Company, and if the assets of the
Company shall be insufficient to pay in full such amounts, then such assets
shall be distributed among such holders and the holders of any Parity Stock
ratably in accordance with the respective amounts that would be payable on such
shares if all amounts payable thereon were paid in full.  In the event of any
complete liquidation, dissolution or winding-up of the Company, whether
voluntary or involuntary, the holders of shares of this Series shall not be
entitled to receive the liquidation price of such shares held by them until the
liquidation price of all Senior Stock shall have been paid in full.

         SECTION 6.  Conversion.

         (a)      Each share of this Series shall be convertible at the option
of the record holder thereof at any time by presentation of the certificate
representing such share by the record holder in person or by registered mail,
return receipt requested with postage prepaid thereon, at the principal office
of the Company, and at such other offices, if any, as the Board of Directors
may determine, into the number of fully paid and nonassessable shares of Common
Stock determined by dividing the Stated Value by the Conversion Price in effect
on the Conversion Date.

         (b)      The conversion price initially shall be $25.00 (the
"Conversion Price") and shall be subject to adjustment from time to time as
follows:
<PAGE>   6
         (i)     If the Company, at any time while any shares of this Series
                 are outstanding, shall (A) pay a stock dividend or stock
                 dividends or otherwise make a distribution or distributions on
                 shares of its capital stock payable in shares of Common Stock
                 (or in securities convertible into shares of Common Stock),
                 (B) except as set forth in clause (A) above, pay a stock
                 dividend or make a distribution on shares of its capital stock
                 payable in shares of its capital stock of any class other than
                 Common Stock or a class convertible into Common Stock, (C)
                 subdivide outstanding shares of Common Stock into a larger
                 number of shares, (D) combine outstanding shares of Common
                 Stock into a smaller number of shares, or (E) issue by
                 reclassification of shares of Common Stock any shares of
                 capital stock of the Company of any class or classes, the
                 Conversion Price in effect immediately prior to such action
                 shall be adjusted so that the holder of any shares of this
                 Series thereafter surrendered for conversion shall be entitled
                 to receive the number and class or classes of shares of the
                 capital stock of the Company which he would have owned or have
                 been entitled to receive immediately after the happening of
                 any of the events described above, had such shares of this
                 Series been converted on or immediately prior to the record
                 date for such dividend or distribution or the effective date
                 of such subdivision, combination or reclassification, as the
                 case may be.  An adjustment made pursuant to this subsection
                 6(b)(i) shall become effective immediately after the record
                 date in the case of a dividend or distribution and shall
                 become effective immediately after the effective date in the
                 case of a subdivision, combination or reclassification.

         (ii)    If the Company, at any time while any shares of this Series
                 are outstanding, shall issue rights or warrants to all holders
                 of Common Stock entitling them (for a period expiring within
                 45 days after the record date mentioned below) to subscribe
                 for or purchase shares of Common Stock at a price per share
                 less than the then Per Share Market Value of Common Stock at
                 the record date mentioned below, the Conversion Price at which
                 each share of this Series shall thereafter be convertible
                 shall be reduced by multiplying the Conversion Price in effect
                 immediately prior to such record date by a fraction, of which
                 the denominator shall be the number of shares of Common Stock
                 (excluding treasury shares, if any) outstanding on the date of
                 issuance of such rights or warrants plus the number of
                 additional shares of Common Stock offered for subscription or
                 purchase, and of which the numerator shall be the number of
                 shares of Common Stock (excluding treasury shares, if any)
                 outstanding on the date of issuance of such rights or warrants
                 plus the number of shares which the aggregate offering price
                 of the total number of shares so offered would purchase at
                 such Per Share Market Value. Such adjustment shall be made
                 whenever such rights or warrants are issued, and shall become
                 effective immediately after the record date for the
                 determination of stockholders entitled to receive such rights
                 or warrants.  However, upon the expiration of any right or
                 warrant to purchase Common Stock the issuance of which
                 resulted in an adjustment in the Conversion Price of the
                 shares of this Series pursuant to this subsection
<PAGE>   7
                 6(b)(ii), if any such right or warrant shall expire and shall
                 not have been fully exercised, the Conversion Price per share
                 of Common Stock at which each share of this Series shall
                 thereafter be convertible shall immediately upon such
                 expiration be recomputed and effective immediately upon such
                 expiration be increased to the price which it would have been
                 (but reflecting any other adjustments in the Conversion Price
                 made pursuant to the provisions of this Section 6 after the
                 issuance of such rights or warrants) had the adjustment of the
                 Conversion Price made upon the issuance of such rights or
                 warrants been made on the basis of offering for subscription
                 or purchase only that number of shares of Common Stock
                 actually purchased upon the exercise of such rights or
                 warrants which were actually exercised.

         (iii)   If the Company, at any time while shares of this Series are
                 outstanding, shall distribute to all holders of Common Stock
                 evidences of its indebtedness or assets (excluding cash
                 dividends or cash distributions paid out of earned surplus) or
                 rights or warrants to subscribe for or purchase any security
                 (excluding those referred to in subsection 6(b)(ii) above)
                 then in each such case the Conversion Price per share of
                 Common Stock at which each share of this Series shall
                 thereafter be convertible shall be determined by multiplying
                 the Conversion Price in effect immediately prior to the record
                 date fixed for determination of stockholders entitled to
                 receive such distribution by a fraction, of which the
                 denominator shall be the Per Share Market Value of Common
                 Stock determined as of the record date mentioned above, and of
                 which the numerator shall be such Per Share Market Value of
                 the Common Stock, less the then fair market value (as
                 determined by the Board of Directors of the Company (the
                 "Board") in good faith, whose determination shall be
                 conclusive if made in good faith; provided, however that in
                 the event of a distribution or series of related distributions
                 exceeding 10% of the net assets of the Company, then such fair
                 market value shall be determined by a nationally recognized or
                 major regional investment banking firm or firm of independent
                 certified public accountants of recognized standing (which may
                 be the firm that regularly examines the financial statements
                 of the Company) selected in good faith by the Board, and in
                 either case shall be described in a statement provided to all
                 registered holders of this Series) of the portion of assets or
                 evidences of indebtedness so distributed or such subscription
                 rights applicable to one share of Common Stock.  Such
                 adjustment shall be made whenever any such distribution is
                 made and shall become effective immediately after the record
                 date mentioned above.

         (iv)    If the Company, at any time while any shares of this Series
                 are outstanding, shall issue or sell shares of Common Stock
                 (excluding stock issuances referred to in other provisions of
                 this Section 6(b)) for a consideration per share which is less
                 than the Per Share Market Value of Common Stock on the date of
                 such issuance or sale, the Conversion Price at which each
                 share of this Series shall thereafter be
<PAGE>   8
                 convertible shall be reduced by multiplying the Conversion
                 Price in effect immediately prior to the date of such issuance
                 or sale by a fraction, of which the denominator shall be the
                 number of shares of Common Stock (excluding treasury shares,
                 if any) outstanding on the date of such issuance or sale plus
                 the number of additional shares of Common Stock issued or
                 sold, and of which the numerator shall be the number of shares
                 of Common Stock (excluding treasury shares, if any)
                 outstanding on the date of such issuance or sale plus the
                 number of shares which the aggregate consideration received or
                 receivable by the Company for the total number of shares so
                 issued or sold would purchase at such Per Share Market Value.
                 Such adjustment shall be made whenever such shares are issued,
                 and shall become effective immediately after such issuance.
                 If the consideration received or receivable by the Company for
                 such issuance or sale of  shares of Common Stock is not cash,
                 the fair market value of such consideration shall be
                 determined by the Board, an investment banking firm, or
                 certified public accountants in the manner specified in
                 subsection 6(b)(iii).

         (v)     If the Company, at any time while any shares of this Series
                 are outstanding, shall issue rights, options, or warrants
                 (excluding those referred to in other provisions of this
                 Section 6(b)) which entitle the holders thereof to purchase
                 shares of Common Stock (such rights, options, or warrants
                 collectively referred to as "Purchase Rights") at a price per
                 share less than the then Per Share Market Value of Common
                 Stock on the date of the issuance of such Purchase Rights, the
                 Conversion Price at which each share of this Series shall
                 thereafter be convertible shall be reduced by multiplying the
                 Conversion Price in effect immediately prior to the date of
                 issuance of such Purchase Rights by a fraction, of which the
                 denominator shall be the number of shares of Common Stock
                 (excluding treasury shares, if any) outstanding on the date of
                 issuance of such Purchase Rights plus the number of additional
                 shares of Common Stock offered for purchase, and of which the
                 numerator shall be the number of shares of Common Stock
                 (excluding treasury shares, if any) outstanding on the date of
                 issuance of such Purchase Rights plus the number of shares
                 which the aggregate consideration received or receivable by
                 the Company in connection with the grant as well as the
                 exercise of such Purchase Rights would purchase at such Per
                 Share Market Value.  Such adjustment shall be made whenever
                 such Purchase Rights are issued, and shall become effective
                 immediately after the issuance of such Purchase Rights.
                 However, upon the expiration of any such Purchase Right the
                 issuance of which resulted in an adjustment in the Conversion
                 Price of the shares of this Series pursuant to this subsection
                 6(b)(v), if any such Purchase Right shall expire and shall not
                 have been fully exercised, the Conversion Price per share of
                 Common Stock at which each share of this Series shall
                 thereafter be convertible shall immediately upon such
                 expiration be recomputed and effective immediately upon such
                 expiration be increased to the price which it would have been
                 (but reflecting any other adjustments in the Conversion Price
                 made pursuant to the provisions of this
<PAGE>   9
                 Section 6 after the issuance of such Purchase Rights) had the
                 adjustment of the Conversion Price made upon the issuance of
                 such Purchase Right been made on the basis of offering for
                 purchase only that number of shares of Common Stock actually
                 purchased upon the exercise of such Purchase Rights which were
                 actually exercised.  If the consideration for the Purchase
                 Rights received or receivable by the Company for the grant or
                 exercise of such Purchase Rights is not cash, the fair market
                 value of such consideration shall be determined by the Board,
                 an investment banking firm, or certified public accountants in
                 the manner specified in subsection 6(b)(iii).

       (vi)      Notwithstanding any other provision of this Section 6(b) to
                 the contrary, no adjustment to the Conversion Price shall be
                 made with respect to the issuance of shares of Common Stock or
                 the grant of options to purchase shares of Common Stock (or
                 the exercise of such options) which are issued or granted to
                 directors, officers, or employees of the Company, or to the
                 Company's 401(k) Plan while shares of this Series are
                 outstanding, unless and until  the aggregate number of such
                 shares issued or issuable upon the exercise of such options
                 exceeds 750,000 shares of Common Stock.

      (vii)      No notification to the holders of any adjustment in the
                 Conversion Price otherwise required by this Section 6 shall be
                 required unless such adjustment would require an increase or
                 decrease of at least 1% in such price; provided, however, that
                 any adjustment which by reason of this subsection 6(b)(vii) is
                 not required to be made shall be carried forward and taken
                 into account in any subsequent adjustments, and that upon
                 presentment of shares of this Series for conversion, all
                 adjustment shall be made calculating the conversion rights of
                 such holder.  All calculations under this Section 6 shall be
                 made to the nearest cent or the nearest 1/100th of a share, as
                 the case may be.

     (viii)      Whenever the Conversion Price is adjusted, as herein provided,
                 the Company shall promptly mail to each registered holder of
                 shares of this Series a notice setting forth the Conversion
                 Price after such adjustment and setting forth a brief
                 statement of the facts requiring such adjustment.  Such notice
                 prepared in good faith shall be conclusive evidence of the
                 correctness of such adjustment absent manifest error.

       (ix)      In case:

                          (A)      the Company shall declare a dividend (or any
                 other distribution) on the Common Stock payable otherwise than
                 in cash out of its earned surplus; or

                          (B)      the Company shall declare a special
                 nonrecurring cash dividend on or a redemption of its Common
                 Stock; or
<PAGE>   10
                          (C)      the Company shall authorize the granting to
                 the holders of the Common Stock of rights or warrants to
                 subscribe for or purchase any shares of capital stock of any
                 class or of any other rights; or

                          (D)      the approval of any stockholders of the
                 Company shall be required in connection with any
                 reclassification of the Common Stock of the Company (other
                 than a subdivision or combination of the outstanding shares of
                 Common Stock), any consolidation or merger to which the
                 Company is a party, any sale or transfer of all or
                 substantially all of the assets of the Company, or any
                 compulsory share exchange whereby the Common Stock is
                 converted into other securities, cash or property, or

                          (E)      of the voluntary or involuntary dissolution,
                 liquidation or winding up of the affairs of the Company;

         then the Company shall cause to be filed at each office or agency
         maintained for the purpose of conversion of the shares of this series,
         and shall cause to be mailed to the holders of record of the shares of
         this Series at their last addresses as they shall appear upon the
         stock books of the Company, at least 10 days prior to the applicable
         record date hereinafter specified, a notice stating (x) the date on
         which a record is to be taken for the purpose of such dividend,
         distribution, redemption, rights or warrants, or, if a record is not
         to be taken, the date as of which the holders of Common Stock of
         record to be entitled to such dividend, distribution, redemption,
         rights or warrants are to be determined, or (y) the date on which such
         reclassification, consolidation, merger, sale, transfer, share
         exchange, dissolution, liquidation or winding up is expected to become
         effective, and the date as of which it is expected that holders of
         Common Stock of record shall be entitled to exchange their shares of
         Common Stock for securities or other property deliverable upon such
         reclassification, consolidation, merger, sale, transfer, share
         exchange, dissolution, liquidation or winding up (but no failure to
         mail such notice or any defect therein or in the mailing thereof shall
         affect the validity of the corporate action required to be specified
         in such notice).

         (c)      In case of any reclassification of the Common Stock, then the
holders of the shares of this Series then outstanding shall have the right
thereafter to convert such shares only into the kind and amount of shares of
stock and other securities and property receivable upon or deemed to be held
following such reclassification by a holder of a number of shares of the Common
Stock of the Company into which such shares of this Series could have been
converted immediately prior to such reclassification.  This provision shall
similarly apply to successive reclassifications.

         (d)      In case of any consolidation or merger of the Company with or
into another Person in which the Company is not the surviving entity or any
compulsory share exchange pursuant to any of which the Common Stock is
converted into other securities, cash or property (any such event being
hereinafter referred to as a "Reorganization"), then the terms of such
Reorganization
<PAGE>   11
shall provide that the holder of a share of this Series then outstanding shall
have the right to receive in exchange therefor, at the option of the Company,
either of the following or such combination of the following as the Company
shall elect:

         (i)     the kind and amount of shares of stock and other securities
                 and property receivable upon such Reorganization
                 ("Reorganization Consideration") by a holder of the number of
                 shares of the Common Stock of the Company into which (x) a
                 share of this Series could have been converted as of the
                 effective date of the Reorganization multiplied by the Agreed
                 Percentage in effect at the effective date of the
                 Reorganization, plus (y) the Arrearage (if any) on a share of
                 this Series could have been exchanged as of the effective date
                 of the Reorganization; or

         (ii)    an amount in cash equal to (x) the Agreed Percentage
                 multiplied by the Stated Value, plus (y) the Arrearage (if
                 any) on a share of this Series as of the effective date of the
                 Reorganization.

         (e)     In case at any time conditions shall arise by reason of action
taken by the Company, which, in the opinion of the Board of Directors of the
Company, are not adequately covered by the other provisions hereof and which
might materially and adversely affect the rights of the holders of shares of
this Series, or in case at any time any such conditions are expected to arise
by reason of any action contemplated by the Company, the Board of Directors of
the Company shall appoint a firm of independent certified public accountants of
recognized standing (which may be the firm that regularly examines the
financial statements of the Company), who shall give their opinion as to the
adjustment, if any (not inconsistent with the standards established in this
Section 6, of the Conversion Price (including, if necessary, any adjustment as
to the securities into which shares of this Series may thereafter be
convertible) which is or would be required to preserve without dilution the
rights of the holders of shares of this Series.  The Board of Directors of the
Company shall make the adjustment recommended forthwith upon the receipt of
such opinion or the taking of any such action contemplated, as the case may be;
provided, however, that no such adjustment of the Conversion Price shall be
made which in the opinion of the investment banking firm or firm of accountants
giving the aforesaid opinion would result in an increase of the Conversion
Price to more than the Conversion Price then in effect.

         Section 7.  Matters Relating to Issuance of Common Stock.  The
following provisions shall be applicable to issuances of Common Stock upon
conversion of shares of this Series or upon an Arrearage Exchange.

         (a)     The Company covenants that it will at all times reserve and
keep available, out of its authorized and unissued Common Stock solely for the
purpose of issuance upon conversion of this Series or upon an Arrearage
Exchange as herein provided, free from preemptive rights or any other actual or
contingent purchase rights of Persons other than the holders of shares of this
Series, such number of shares of Common Stock as shall then be issuable upon
the conversion of all outstanding shares of this Series or the exchange of any
Arrearage on shares of this Series.
<PAGE>   12
The Company covenants that all shares of Common Stock that shall be so issuable
shall upon issue be duly and validly issued and fully paid and nonassessable.

         (b)     The Company shall not be required to issue stock certificates
representing fractions of shares of Common Stock, but may, if otherwise
permitted, make a cash payment in respect of any final fraction of a share
based on the Per Share Market Value at such time.  If the Company elects not,
or is unable, to make such a cash payment, the holder of a share of this Series
shall be entitled to receive, in lieu of the final fraction of a share, one
whole share of Common Stock.

         (c)     The issuance of certificates for shares of Common Stock on
conversion of this Series or on an Arrearage Exchange shall be made without
charge to the holders thereof for any documentary stamp or similar taxes that
may be payable in respect of the issue or delivery of such certificate,
provided, that the Company shall not be required to pay any tax that may be
payable in respect of any transfer involved in the issuance and delivery of any
such certificate in a name other than that of the holder of the shares of this
Series converted or upon which an Arrearage Exchange was made and the Company
shall not be required to issue or deliver such certificates unless or until the
Person or Persons requesting the issuance thereof shall have paid to the
Company the amount of such tax or shall have established to the satisfaction of
the Company that such tax has been paid.

         (d)     The exercise by a holder of shares of this Series of the
conversion or Arrearage Exchange rights granted herein is subject in all
respects to and conditioned upon compliance by the parties with the HSR Act,
and rules and regulations promulgated pursuant thereto, to the extent that said
act, rules and regulations are applicable to such exercise.  The Company and
such holder agree to make such filings with and provide such information to the
Federal Trade Commission and the Department of Justice with respect to such
exercise as are required in connection with the HSR Act in a timely manner and
to join each others request for early termination.  The Company and such holder
will use such reasonable efforts to obtain all governmental approval required
to permit such exercise and to cause early termination of the waiting period
under the HSR Act.

         SECTION 8.  Maturity Date.  If any or all shares of this Series have
not been redeemed or converted prior to September 1, 2012, (i) such shares
shall automatically be converted into the number of shares of Common Stock
determined by dividing the Stated Value by the Conversion Price in effect at
the time of conversion, and (ii) the Arrearage (if any) on such shares of this
Series shall automatically be exchanged for the number of shares of Common
Stock determined by dividing the Arrearage by the Per Share Market Value on
such date.

         SECTION 9.  Definitions.  For the purposes hereof, the following terms
shall have the following respective meanings:

                 "Arrearage" has the meaning specified in Section 2(a).
<PAGE>   13
                 "Arrearage Exchange" has the meaning specified in Section
         2(b).

                 "Common Stock" means shares now or hereafter authorized of the
         class of Common Stock, $.10 par value, of the Company presently
         authorized and stock of any other class into which such shares may
         hereafter have been reclassified or changed.

                 "Conversion Date" means the date the stock certificate is
         received by the Company for conversion in accordance with Section
         6(a).

                 "Conversion Price" has the meaning specified in Section 6(b).

                 "Dividend Period" has the meaning specified in Section 2(a).

                 "Dividend Rate" has the meaning specified in Section 2(a).

                 "Exchange Notice" has the meaning specified in Section 2(b).

                 "Redemption Threshold" means the date on which the Per Share 
         Market Value first exceeds 140% of the Conversion Price per share of 
         Common Stock for any 20 out of any 30 consecutive Trading Days.

                 "Junior Stock" means the Common Stock of the Company and any
         other stock of the Company over which shares of this Series has a
         preference as to distribution of assets and payment of dividends.

                 "Agreed Percentage" means 140%, provided that if the
         Redemption Threshold has occurred at any time prior to the date of
         determination, then "Agreed Percentage" means 100%.

                 "Parity Stock" means any stock of the Company ranking as to
         distribution of assets and payment of dividends on a parity with this
         Series.

                 "Per Share Market Value" means on any particular date (a) the
         last sale price per share of the Common Stock on such date on the
         principal stock exchange on which the Common Stock has been listed or,
         if there is no such price on such date, then the last price on such
         exchange on the date nearest preceding such date, or (b) if the Common
         Stock is not listed on any stock exchange, the final bid price for a
         share of Common Stock in the over-the-counter market, as reported by
         the Nasdaq National Market at the close of business on such date, or
         the last sales price if such price is reported and final bid prices
         are not available, or (c) if the Common Stock is not quoted on the
         Nasdaq National Market, the bid price for a share of Common Stock in
         the over-the-counter market as reported by the National Quotation
         Bureau Incorporated (or any similar organization or agency succeeding
         to its functions of reporting prices), or (d) if the Common Stock is
         no
<PAGE>   14
         longer publicly traded, as determined by a nationally recognized or
         major regional investment banking firm or firm of independent
         certified public accountants of recognized standing (which may be the
         firm that regularly examines the financial statements of the Company)
         selected in good faith by the Board of Directors of the Company,
         provided, that none of the transactions related to the foregoing shall
         include purchases by any "affiliate" (as such term is defined in the
         General Rules and Regulations under the Securities Act of 1933) of the
         Company.

                 "Person" means a corporation an association, a partnership, an
         organization, a business, an individual, a government or political
         subdivision thereof or a governmental agency.

                 "Preferred Stock" means the Company's Preferred Stock, $1.00
         par value.

                 "Reorganization" has the meaning specified in Section 6(d).

                 "Reorganization Consideration" has the meaning specified in
         Section 6(d).

                 "Senior Stock" means any shares or class of the Company that
         are by their terms expressly given priority over this Series as to
         payment of dividends or distribution of assets on any liquidation of
         the Company.

                 "Stated Value" has the meaning specified in Section 1.

                 "Trading Day" means (a) a day on which the Common Stock is
         traded on the principal stock exchange on which the Common Stock has
         been listed, or (b) if the Common Stock is not listed on any stock
         exchange, a day on which the Common Stock is quoted in the
         over-the-counter market, as reported by the Nasdaq Stock Market, or
         (c) if the Common Stock is not quoted on the Nasdaq Stock Market, a
         day on which the Common Stock is quoted in the over-the-counter market
         as reported by the National Quotation Bureau Incorporated (or any
         similar organization or agency succeeding to its functions of
         reporting prices).

         IN WITNESS WHEREOF, said Plains Resources Inc. has caused this
Certificate to be signed by a duly authorized officer, this 11th day of
November, 1997.

                                  PLAINS RESOURCES INC.


                                  By: /s/ Phillip D. Kramer
                                     ----------------------------------------
                                  Name:   Phillip D. Kramer
                                  Title:  Senior Vice President


ATTEST:


By: /s/ Michael R. Patterson
   -----------------------------------
Name:   Michael R. Patterson
Title:  Secretary

<PAGE>   1

                                                                       EXHIBIT 3

THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED, AND MAY BE REOFFERED AND SOLD ONLY IF SO REGISTERED OR IF AN EXEMPTION
FROM REGISTRATION IS AVAILABLE.

                            PLAINS RESOURCES INC.
                                                                       WARRANT 1

             WARRANT FOR THE PURCHASE OF SHARES OF COMMON STOCK

                                                                  150,000 shares

         FOR VALUE RECEIVED, PLAINS RESOURCES INC., a Delaware corporation (the
"Company"), hereby certifies that SHELL LAND & ENERGY COMPANY, or its permitted
assigns (the "Holder"), is entitled to purchase from the Company, at any time
or from time to time commencing on the date hereof and prior to 5:00 P.M.,
Houston time then current, on November 12, 2002, 150,000 fully paid and
non-assessable shares of the common stock, $.10 par value per share, of the
Company for a purchase price per share of $25.00 (the "Per Share Warrant
Price").  (Hereinafter, (i) said common stock, together with any other equity
securities which may be issued by the Company with respect thereto or in
substitution therefor, is referred to as the "Common Stock," (ii) the shares of
the Common Stock purchasable hereunder are referred to as the "Warrant Shares,"
(iii) the aggregate purchase price payable hereunder for the Warrant Shares is
referred to as the "Aggregate Warrant Price," and (iv) this Warrant and all
warrants hereafter issued in exchange or substitution for this Warrant are
referred to as the "Warrant".)  The Aggregate Warrant Price is not subject to
adjustment.  The number of Warrant Shares and the Per Share Warrant Price is
subject to adjustment as hereinafter provided.

         10.     Exercise of Warrant.  This Warrant may be exercised, in whole
at any time or in part from time to time, commencing on the date hereof, and
prior to 5:00 P.M., Houston time then current, on November 12, 2002, by the
Holder by the surrender of this Warrant (with the subscription form at the end
hereof duly executed) at the Company's offices in Houston, Texas, together with
proper payment of the Aggregate Warrant Price, or the proportionate part
thereof if this Warrant is exercised in part.  Payment for Warrant Shares shall
be made by certified or cashier's bank check payable to the order of the
Company.  If this Warrant is exercised in part, this Warrant must be exercised
for a number of whole shares of the Common Stock, and the Holder is entitled to
receive a new Warrant covering the Warrant Shares which have not been
exercised.  Upon such surrender of this Warrant, the Company will (a) issue a
certificate or certificates in the name of the Holder for the largest number of
whole shares of the Common Stock to which the Holder shall be entitled (no
fractional shares being issuable upon exercise of this Warrant), and deliver
the other securities and properties receivable upon the exercise of this
Warrant, or the proportionate part thereof if this Warrant is exercised in
part, pursuant to the provisions of this Warrant.  The Company shall pay all
taxes and other expenses payable in connection the preparation, execution and
delivery of stock certificates pursuant to this Section 1.  Unless and until
the Warrant Shares are registered under the Securities Act of 1933, as
<PAGE>   2
amended (the "Act") as provided for in Exhibit A-3 to the Exchange Agreement
pursuant to which this Warrant has been issued, certificates evidencing the
Warrant Shares issued upon exercise of this Warrant shall bear a restrictive
legend regarding limitations on transferability of such shares.

         11.     Reservation of Warrant Shares; Listing.  The Company agrees
that, prior to the expiration of this Warrant, the Company will at all times
(a) have authorized and in reserve, and will keep available, solely for
issuance or delivery upon the exercise of this Warrant, the shares of the
Common Stock and other securities and properties as from time to time shall be
receivable upon the exercise of this Warrant, and (b) keep the shares of the
Common Stock receivable upon the exercise of this Warrant listed upon notice of
issuance on the American Stock Exchange or such other national securities
exchange as the Common Stock of the Company may be listed from time to time.

         12.     Protection Against Dilution.

         1.      In case the Company shall hereafter (i) pay a dividend or make
a distribution on its capital stock in shares of Common Stock, (ii) subdivide
its outstanding shares of Common Stock into a greater number of shares, (iii)
combine its outstanding shares of Common Stock into a smaller number of shares
or (iv) issue by reclassification of its Common Stock other securities of the
Company, the kind and amount of Common Stock and other securities shall be
adjusted so that the Holder of this Warrant upon the exercise hereof shall be
entitled to receive the number of shares of Common Stock or other securities of
the Company which he would have owned immediately following such action had
this Warrant been exercised immediately prior thereto.  An adjustment made
pursuant to this Subsection 3(a) shall become effective immediately after the
record date in the case of a stock dividend or distribution and shall become
effective immediately after the effective date in the case of a subdivision,
combination or reclassification.  If, as a result of an adjustment made
pursuant to this Subsection 3(a), the Holder of this Warrant thereafter
surrendered for exercise shall become entitled to receive shares of two or more
classes of capital stock or shares of Common Stock and other securities of the
Company, the Board of Directors (whose determination shall be made in its
reasonable judgment) shall determine the allocation of the adjusted Per Share
Warrant Price between or among shares of such classes or capital stock or
shares of Common Stock and other securities.

         2.      In case of any capital reorganization or reclassification, or
any consolidation or merger to which the Company is a party other than a merger
or consolidation in which the Company is a continuing corporation, or in case
of any sale or conveyance to another entity of the property of the Company as
an entirety or substantially as an entirety, or in the case of any statutory
exchange of securities with another corporation (including any exchange
effected in connection with a merger of a third corporation into the Company),
the Holder of this Warrant shall have the right thereafter to convert this
Warrant into the kind and amount of securities, cash or other property which he
would have owned or have been entitled to receive immediately after such
reorganization, reclassification, consolidation, merger, statutory exchange,
sale or conveyance had this Warrant been converted immediately prior to the
effective date of such
<PAGE>   3
reorganization, reclassification, consolidation, merger, statutory exchange,
sale or conveyance and in any such case, if necessary, appropriate adjustment
shall be made in the application of the provisions set forth in this Section 3
with respect to the rights and interests thereafter of the Holder of this
Warrant to the end that the provisions set forth in this Section 3 shall
thereafter correspondingly be made applicable, as nearly as may reasonably be,
in relation to any shares of stock or other securities or property thereafter
deliverable on the exercise of this Warrant.  The above provisions of this
Subsection 3(b) shall similarly apply to successive reorganizations,
reclassifications, consolidations, mergers, statutory exchanges, sales or
conveyances.  In the event of a statutory merger, the issuer of any shares of
stock or other securities or property thereafter deliverable on the exercise of
this Warrant shall be responsible for all of the agreements and obligations of
the Company hereunder.  Notice of any such reorganization, reclassification,
consolidation, merger, statutory exchange, sale or conveyance and of said
provisions so proposed to be made, shall be mailed to the Holder of this
Warrant not less than 20 days prior to such event.

         3.      Whenever the number of Warrant Shares purchasable upon the
exercise of this Warrant is adjusted, as herein provided, the Per Share Warrant
Price shall be adjusted by multiplying such Per Share Warrant Price immediately
prior to such adjustment by a fraction, of which the numerator shall be the
number of Warrant Shares purchasable upon exercise of this Warrant immediately
prior to such adjustment, and of which the denominator shall be the number of
Warrant Shares so purchasable immediately thereafter.

         4.      Whenever the number of Warrant Shares purchasable upon the
exercise of this Warrant or the Per Share Warrant Price is adjusted, as herein
provided, the Company shall promptly mail by first class mail, postage prepaid
to the Holder notice of such adjustment setting forth a brief statement of the
facts requiring such adjustment and the computation by which such adjustment
was made.

         5.      In the event that the Company issues securities, makes a
distribution to its stockholders or undertakes some other capital change or
transaction that the Company's Board of Directors in its reasonable judgment
determines is an issuance, distribution, change or transaction that warrants an
adjustment similar to those provided in this Section 3 based upon the intent
hereof but with respect to which the provisions hereof are not specifically
applicable, adjustments to the number of shares or other securities purchasable
and the price of shares or other securities comparable to those provided in
this Section 3 shall be made as a result of such issuance, distribution, change
or transaction.

         13.     Fully Paid Stock.  The Company agrees that the shares of the
Common Stock represented by each and every certificate for Warrant Shares
delivered on the exercise of this Warrant shall, at the time of such delivery,
be validly issued and outstanding, fully paid and non-assessable, and not
subject to preemptive rights.
<PAGE>   4
         14.     Limited Transferability.  This Warrant is transferable or
assignable by the Holder and is so transferable only upon the books of the
Company which it shall cause to be maintained for the purpose.  The Company may
treat the registered Holder of this Warrant as he or it appears on the
Company's books at any time as the Holder for all purposes.  Any Warrant issued
upon the transfer or assignment of this Warrant will be dated the same date as
this Warrant.  Provided, however, this Warrant may not be transferred unless it
is registered under the Act, or an exemption from such registration is
available.

         15.     Loss, etc., of Warrant.  Upon receipt of evidence satisfactory
to the Company of the loss, theft, destruction or mutilation of this Warrant,
and of indemnity reasonably satisfactory to the Company, if lost, stolen or
destroyed, and upon surrender and cancellation of this Warrant, if mutilated,
the Company shall execute and deliver to the Holder a new Warrant of like date,
tenor and denomination.

         16.     Warrant Holder Not Shareholder.  Except as otherwise provided
herein, this Warrant does not confer upon the Holder any right to vote or to
consent to or receive notice as a shareholder of the Company, as such, in
respect of any matters whatsoever, or any other rights or liabilities as a
shareholder, prior to the exercise hereof.

         17.     Headings.  The headings of this Warrant have been inserted as
a matter of convenience and shall not affect the construction hereof.

         18.     Applicable Law.  This Warrant shall be governed by and
construed in accordance with the law of the State of Delaware without giving
effect to the principles of conflicts of law thereof.

         IN WITNESS WHEREOF, PLAINS RESOURCES INC. has caused this Warrant to
be signed by its President or Vice President this ____ day of November, 1997.

                                            PLAINS RESOURCES INC.



                                            By:
                                               ----------------------------
                                            Name:  Phillip D. Kramer
                                            Title: Senior Vice President
<PAGE>   5
                                  SUBSCRIPTION

         The undersigned, ___________________, pursuant to the provisions of
the foregoing Warrant, hereby agrees to subscribe for and purchase
______________ shares of the Common Stock of PLAINS RESOURCES INC. covered by
said Warrant, and makes payment therefor in full at the price per share
provided by said Warrant.

Dated: 
      ------------------
                                        Signature: 
                                                  -------------------------
                                        Address:

                                        -----------------------------------
                                        -----------------------------------
                                        -----------------------------------

                                   ASSIGNMENT

         FOR VALUE RECEIVED ________________________ hereby sells, assigns and
transfers unto _________________________ the foregoing Warrant and all rights
evidenced thereby, and does irrevocably constitute and appoint
__________________, attorney, to transfer said Warrant on the books of PLAINS
RESOURCES INC.

Dated: 
      ------------------
                                        Signature: 
                                                  -------------------------
                                        Address:

                                        -----------------------------------
                                        -----------------------------------
                                        -----------------------------------

                               PARTIAL ASSIGNMENT

         FOR VALUE RECEIVED _________________________ hereby assigns and
transfers unto ________________________ the right to purchase _________ shares
of the Common Stock of PLAINS RESOURCES INC. by the foregoing Warrant, and a
proportionate part of said Warrant and the rights evidenced hereby, and does
irrevocably constitute and appoint ___________________, attorney, to transfer
that part of said Warrant on the books of PLAINS RESOURCES INC.

Dated: 
      ------------------
                                        Signature: 
                                                  -------------------------
                                        Address:

                                        -----------------------------------
                                        -----------------------------------
                                        -----------------------------------




<PAGE>   1
                                                                       EXHIBIT 4


                                SERVICE AGREEMENT


         In conjunction with the November 12, 1997 Exchange Agreement between
Shell Land and Energy Company and Shell Western E&P Inc. (Hereinafter collective
referred to as "Shell") and Plains Resources Inc. (hereinafter referred to as
"Plains"), Plains requests and Shell agrees to provide consulting services
("Services") during a transition period to help familiarize Plains (or its
affiliates or assigns) personnel with the facilities and operation of the Arroyo
Grande field.

The Services will be provided according to the following terms:

1.   The transition period shall begin at 7:00 a.m. on November 11, 1997 and
continue for the next ensuing 60 days, unless earlier terminated by Plains, upon
seven (7) days written notice. The parties agree that this agreement may be
extended for an additional 60 day period upon giving seven (7) days written
notice prior to the end of the initial 60 day period.

2.   a.  The services shall consist of advice, information and hands on 
operations of the field, including but not limited to: (1), the logistics and
physical placement of oil field facilities and controls; (2) an explanation of
the mechanical operation of facilities located on the Arroyo Grande field and
(3), such other field work as is reasonable and necessary for proper maintenance
and operation of the field.

     b.  It is the intent of the Parties that Services hereunder will be
performed by Shell employees Robert Coons, John Bates, Tom Knotts, Brent
Randolph, Bowman Lau, Paul De Lorenzo, Joanne Miller, and contractors Jim
Bognuda, Dean Roberts, and Jim Leamons. If such employees or contractors are
unable or refuse to perform the Services, Shell will use good faith efforts to
substitute other employees or contractors at a comparable performance level are
in compliance with Shell's personnel policies, who have prior experience and
expertise as concerns operations at Arroyo Grande. Plains shall have the right
to refuse the services of such substitutes, but if refused, Shell shall not be
obligated to provide other employees or contractors. Plains reserves the right,
but not the obligation, to make an offer of employment to an employee or
contractors at any time during this Agreement. Shell and Area Energy LLC agree
that it will not offer said employee(s) a competing offer of employment prior to
January 1, 1998. It is understood that John Bates and Joanne Miller though
currently performing duties in the Arroyo Grande Field have been offered
employment opportunities with Aera Energy's organization.

3.   Plains shall pay Shell an amount equal to the salary and wages paid by 
Shell to the personnel performing the services, plus an amount equal to 33% of 
such salary and wages to cover payroll taxes, workers' compensation expenses 
and pension and benefits expenses with respect to such


<PAGE>   2
personnel. Shell shall provide a statement setting forth the amount due for the
Services within sixty days of termination of the transition period.

4.   Both Plains and Shell agree that the Services to be provided shall be
performed by Shell as an independent contractor.

5.   This Agreement is not intended and shall not be construed as creating a 
joint venture, partnership, agency or other association.

6.   Plains agrees to defend, indemnify and hold harmless Shell, its affiliates
and their representatives officers, directors, employees, contractors, agents or
representatives, from and against any and all liability or loss that may be
asserted by Plains or any third person, including Plains' employees,
contractors, and agents, arising out of or in connection with actions of Shell
in connection with performance of the Services; provided that this indemnity
shall not apply to any loss or liability caused by Shell's gross or willful
misconduct.

7.   The obligations set for the in this Agreement shall survive the expiration 
of the Agreement.

8.   This Agreement may be assigned by Plains to any of its affiliates or
subsidiaries.

If you are in agreement with the terms and provisions as stated above, please do
so by signing and returning one copy of the Agreement.

                                           Plains Resources Inc.


                                           _______________________________

                                           Title:_________________________


Accepted and agreed to this 12th day of November, 1997

Shell Land and Energy Company              AERA Energy LLC


By_________________________                By______________________________

Title______________________                Title___________________________

Shell Western E&P Inc.

By__________________________

Title_________________________



                                       -2-

<PAGE>   1
                                                                       EXHIBIT 5





                               EXCHANGE AGREEMENT





                          SHELL LAND & ENERGY COMPANY

                             SHELL WESTERN E&P INC.


                                      AND

                             PLAINS RESOURCES INC.

<PAGE>   2



                               TABLE OF CONTENTS



<TABLE>
<S>      <C>                                                                                                           <C>
1.       PROPERTIES BEING EXCHANGED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
         (a)     Leases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
         (b)     Fee Interests  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
         (c)     Rights in Production . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
         (d)     Rights; Working Interests  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
         (e)     Easements  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
         (f)     Permits  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
         (g)     Wells  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
         (h)     Facilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
         (i)     Equipment & Personal Property  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
         (j)     Exclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.       CONSIDERATION  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

3.       CLOSING AND PERFORMANCE DEPOSIT  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
         (a)     Closing  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
         (b)     At Closing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

4.       FURTHER ASSURANCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

5.       EXCHANGE EFFECTIVE DATE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

6.       PRE-ACQUISITION REVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
         (a)     Review of the SHELL Property . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
         (b)     Conditions to Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
         (c)     Review Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

7.       DISCLAIMERS/ACKNOWLEDGMENTS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
         (a)     No Warranty, Express or Implied  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
         (b)     Acknowledgments of Grantee at Closing  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

8.       INDEPENDENT EVALUATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

9.       CONSENTS; PREFERENTIAL RIGHTS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
         (a)     SHELL Property . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
         (b)     PLAINS Property  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10

10.      TITLE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
         (a)     Title Examination  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
         (b)     Significant Title Defect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
         (c)     Personal Property Inventory List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
</TABLE>





                                                                               i
<PAGE>   3
<TABLE>
<S>  <C>                                                                                                               <C>
11.      REPRESENTATIONS BY SHELL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
         (a)     Due Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
         (b)     Power  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
         (c)     Duly Executed  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
         (d)     No Litigation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
         (e)     No Liens or Royalty Obligations  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12

12.      REPRESENTATIONS OF PLAINS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
         (a)     Due Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
         (b)     Power  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
         (c)     Duly Executed  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
         (d)     No Litigation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
         (e)     Hazardous Releases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
         (f)     Environmental Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13

13.      SHELL'S CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
         (a)     Representations True . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
         (b)     No Pending Suits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
         (c)     No Act of Termination  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
         (d)     H-S-R  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13

14.      PLAINS' CONDITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
         (a)     Representations True . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
         (b)     No Pending Suits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
         (c)     No Act of Termination  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
         (d)     H-S-R  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
         (e)     No Material Changes  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13

15.      OPERATIONS AND PRODUCTION PRIOR TO CLOSING:  SHELL PROPERTY  . . . . . . . . . . . . . . . . . . . . . . . .  14
         (a)     Operations Prior to Closing  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
         (b)     Closing Settlement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
         (c)     Interim Accounting, Payment and Collection Services  . . . . . . . . . . . . . . . . . . . . . . . .  14
                                                                       
16.      TAXES, COSTS, AND FEES   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
         (a)     Taxes and Fees . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
         (b)     No Brokers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
                                                                       
17.      OPERATIONS BY GRANTEE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
         (a)     Compliance with Laws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
         (b)     Assumption of Obligations  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
                                                                       
18.      INDEMNIFICATION  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
         (a)     General Indemnity by GRANTEE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
         (b)     Environmental Indemnity by GRANTEE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
         (c)     Definitions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  18
         (d)     Indemnified Party's Participation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  23
</TABLE>





                                                                              ii
<PAGE>   4
<TABLE>
<S>  <C>                                                                                                               <C>
         (e)     GRANTEE'S Indemnification and Financial Obligations to GRANTOR to Survive
                 Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  24
         (f)     SHELL Acknowledgment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  24
                                                                                          
19.      EXISTING CONTRACTS   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  24
         (a)     Assumption of Contracts  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  24
                                                                                          
20.      NOTICES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  25
                                                                                          
21.      PARTIES IN INTEREST  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26
                                                                                          
22.      COMPLETE AGREEMENT   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26
                                                                                          
23.      SHELL ACTION   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
                                                                                          
24.      APPLICABLE LAW   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
                                                                                          
25.      MISCELLANEOUS PROVISIONS   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
         (a)     Captions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
         (b)     Partial Invalidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
         (c)     Modification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
         (d)     Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
         (e)     Counterparts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
         (f)     Expenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
         (g)     Signs  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
         (h)     Press Releases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
         (i)     No Recording . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  29
         (j)     Survival . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  29
         (k)     Exhibits and Schedules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  29
         (l)     Time of Essence  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
         (m)     H-S-R  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
         (n)     No Partnership . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  31
         (o)     File Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  31
         (p)     Rule 430 Nox Reduction Liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32
         (q)     Pismo Creek Pipeline Crossing Expenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
         (r)     Operational Continuity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
                                                                                          
26.      CALL ON PRODUCTION   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
</TABLE>





                                                                             iii
<PAGE>   5
                               EXCHANGE AGREEMENT


         SHELL Land & Energy Company, a Delaware corporation, and SHELL Western
E&P Inc., a Delaware corporation, herein collectively referred to as "SHELL,"
and PLAINS RESOURCES INC., a Delaware corporation, herein referred to as
"PLAINS," enter into this Exchange Agreement, herein called the "AGREEMENT," in
consideration of the parties' agreement to exchange the SHELL Property (as
defined below) for the PLAINS Property (as defined below), all pursuant to the
terms and conditions of this AGREEMENT.  SHELL also agrees that it may be
referred to herein as the "GRANTOR" of the SHELL Property and the "GRANTEE" of
the PLAINS Property.  PLAINS agrees also that it may be referred to as the
"GRANTOR" of the PLAINS Property and the "GRANTEE" of the "SHELL" Property.
Additionally, PLAINS and SHELL agree that they may also be referred to herein
individually as a "Party" or, collectively, as the "Parties."

         1.      PROPERTIES BEING EXCHANGED.  Subject to the terms and
conditions set forth hereinafter, SHELL conveys to PLAINS the SHELL Property
(as defined below) and PLAINS conveys to SHELL the PLAINS Property (as defined
below), and tenders additional consideration therefor, in the manner and of the
type and amount as hereinafter required.  For purposes of this AGREEMENT, the
"SHELL Property", is the property set forth on Exhibit "A-1" attached hereto,
and the "PLAINS Property" is the Participation Agreement dated November 10,
1997 (the "Murphy/Callon Agreement") with Murphy Oil Corporation and Callon
Petroleum Operating Company (together, "Murphy/Callon") which is attached
hereto as Exhibit "A-2".  PROPERTY shall mean all of GRANTOR's right, title,
and interest in and to (i) the property and property interests described in
Exhibits "A-1", "A-2" or "A-3" hereto, and (ii) all property and property
interests listed in subsections (a) through (i) of this section 1, to the
extent such property or property interests are a part of, grant rights in, or
with respect to, or are located on the property and property interests





                                                                               1
<PAGE>   6



described in Exhibits "A-1", "A-2" or "A-3"; but excluding the property
specified in subsection (j).

                 (a)      Leases.  Leasehold interests in oil, gas, or other
minerals, including working interests, carried working interests, rights of
assignment and reassignment, and other interests under or in oil, gas or
mineral leases, and interests in rights to explore for and produce oil, gas,
and other minerals.

                 (b)      Fee Interests.  Fee interests to the surface and in
oil, gas or other minerals, including rights under mineral deeds, conveyances,
or assignments.

                 (c)      Rights In Production.  Royalties, overriding
royalties, production payments, rights to take royalties in kind, or other
interests in production of oil, gas, or other minerals.

                 (d)      Rights; Working Interests.  Rights and interests in
or derived from unit agreements, orders or decisions of state and federal
regulatory authorities establishing units, joint operating agreements, enhanced
recovery and injection agreements, farmout agreements and farmin agreements,
options, drilling agreements, exploration agreements, assignments of operating
rights, working interests, subleases, and rights above or below certain footage
depths, horizons or interests described in paragraphs a-c above except those
contracts or agreements described in subsection (j) below.

                 (e)      Easements.  To the extent transferable,
rights-of-way, surface or ground leases, easements, servitudes, and franchises
located on or granting rights to the property or property interests described
in Exhibits "A-1" or "A-2" hereto and acquired or used in connection with
operations for the exploration, production, processing, and transportation of
oil, gas or other minerals with respect to the properties and interests
described in subsections (a)-(d) above, and such other rights-of-way, surface
or ground leases, easements, and servitudes specifically listed on SCHEDULE 
"1(e)" 





                                                                               2
<PAGE>   7



hereto, which are not located on or grant rights to such property and
property interests, but which were acquired or used in such operations with
respect to such property and property interests.

                 (f)      Permits.  To the extent transferable, permits and
licenses of any nature owned, held, or operated in connection with operations
for the exploration and production, processing and transportation of oil, gas,
or other minerals.

                 (g)      Wells.  Producing, non-producing, shut-in oil and
abandoned oil and gas wells, salt water disposal wells, injection wells, and
water wells located on the property or property interests described in Exhibits
"A-1" or "A-2" hereto and used in connection with the properties or interests
described in subsections (a)-(f) above.

                 (h)      Facilities.  All facilities, buildings, improvements,
gas plants, gathering lines, flow lines, injection lines, and pipelines and
appurtenances located on the real property and on lands included in the
property and property interests described on Exhibits "A-1" or "A-2".

                 (i)      Equipment and Personal Property.  All surface and
down-hole equipment, fixtures, inventory, and personal property located on the
property and property interests described in Exhibits "A-1" or "A-2" hereto,
and used in connection with the properties or interests described in
subsections (a)-(h) above, but excluding all property described in subsection
(j) below.

                 (j)      Exclusions.  The PROPERTY shall not include any
rights-of-way, surface or ground leases, easements, franchises, permits,
licenses, or other contracts or agreements which by their own terms are not
transferable, Proprietary Data (as defined in subsection 25(o)), rental
equipment, computer software, televisions, VCRs, copy machines, and store stock
left on consignment and belonging to third parties.

         2.      CONSIDERATION.  As consideration for the exchange, SHELL
conveys to PLAINS 



                                                                               3
<PAGE>   8



the SHELL Property described on Exhibit "A-1" and PLAINS conveys to SHELL the
Property described on Exhibit "A-2" and the Preferred Stock and the Warrant to
Purchase Common Stock of PLAINS (the "Warrant") described on Exhibit "A-3".

         3.      CLOSING.

                 (a)      Closing.  Closing is on November 10, 1997, (the
"Closing Date"), at a time and place to be designated by SHELL.  "Closing"
shall mean the consummation of the exchange by transfer of SHELL'S and PLAINS'
ownership in the PROPERTY, payment of all exchange consideration, and transfer
of the operation and possession of the PROPERTY.

                 (b)      At Closing:

                          Conveyance.  SHELL will convey the SHELL PROPERTY to
PLAINS and PLAINS will convey the PLAINS Property to SHELL by executing and
delivering (i) an Assignment and Conveyance and Grant Deed, (ii) Assignment of
Contractual Rights, and (iii) a Personal Property Agreement and Bill of Sale in
substantially the form attached hereto as Exhibits "B-1", "B-2" and "C"
respectively, and both shall deliver to the other a Non-Foreign Affidavit in
substantially the form attached hereto as Exhibits "D" and "F".  In addition,
PLAINS will execute and deliver to SHELL a certificate for 46,600 Shares of
Preferred Stock designated Series D Cumulative Convertible Preferred Stock and
the Warrant to Purchase 150,000 Shares of Common Stock as described on Exhibit
"A-3".

         4.      FURTHER ASSURANCES.  GRANTOR and GRANTEE each agree to execute
and deliver to the other Party all division orders, letters in lieu, transfer
orders, and all other documents necessary to fully vest in GRANTEE the rights,
obligations, and benefits acquired pursuant to this AGREEMENT.





                                                                               4
<PAGE>   9



         5.      EXCHANGE EFFECTIVE DATE.  The exchange herein shall be
effective as of November 1, 1997, at 12:00 a.m.  Pacific Standard Time, herein
called the "Effective Date."  All revenues and expenses of the SHELL PROPERTY
from November 1, 1997, to the Closing Date shall be for the account of PLAINS.

         6.      PRE-ACQUISITION REVIEW.  SHELL acknowledges that PLAINS has no
files, records or any information regarding the properties which are the
subject of the Murphy/Callon Agreement.  The following provisions of this
Paragraph 6 relate to the SHELL Property only.

                 (a)      Review of the SHELL Property. PLAINS and its
employees, agents, and contractors have had the right and opportunity, but not
the obligation, to do the following (the "Pre-Acquisition Review"), at its sole
cost and expense but with the cooperation and assistance of SHELL:

                          (1)     [omitted]*

                          (2)     To inspect and review at SHELL's and its
affiliates' offices, all non-privileged and non-proprietary files, records,
documents, and data related to the above matters, including, but not limited
to, any of the following which SHELL may have:  Original Well Record Files on
all wells (i.e., all wells situated on the SHELL Property), Regulatory,
Accounting, Marketing, Environmental, Land, Contracts, Pipeline, Maintenance,
Transportation, Processing, Exploration, Production, and Engineering files and
records.  Non-proprietary files, records, documents, and data mean those which
do not constitute Proprietary Data as described in subsection 25(o) below.

                 (b)      Conditions to Review.  Prior to the commencement of
the Pre-Acquisition Review, SHELL and PLAINS agreed that the following
conditions were satisfied:

* Note: The term "omitted" as used throughout this exhibit is in complete
  conformity to the executed agreement.



                                                                               5
<PAGE>   10



                          (1)     PLAINS delivered a Pre-Acquisition Review
plan to SHELL, including the identity of any party participating in or
associated with the plan, and an estimated timetable for events under the plan.
Such plan was approved in writing by SHELL;

                          (2)     PLAINS signed and delivered to SHELL an
agreement for Indemnification and Responsibility for Damages in the form of
Exhibit "E" attached hereto (the "Indemnification Agreement");

                          (3)     PLAINS maintained the results of its
investigation, testing, and evaluation and review of files and records,
including title examination reviews, confidential in accordance with the
provisions, terms, and conditions of that certain Confidentiality Agreement
entered into on the SHELL Property between SHELL and PLAINS, dated February 26,
1997 a copy of which is attached hereto as Exhibit "K" (the "Confidentiality
Agreement"); and

                          (4)     PLAINS provided SHELL a copy of  final
assessment reports of or about the SHELL Property, including reports, data, and
conclusions developed pursuant to such reports and the Pre-Acquisition Review,
and SHELL was permitted to discuss the contents of any such assessment reports
with the party who prepared such reports.

                          (5)     [OMITTED]

                 (c)      Review Results.

                          (1)     [omitted]

                          (2)     [omitted]

                          (3)     [omitted]

                          (4)     [omitted]





                                                                               6
<PAGE>   11



         7.      DISCLAIMERS/ACKNOWLEDGMENTS.

                 (a)      No Warranty; Express Or Implied.  CONVEYANCE OF THE
PROPERTY SHALL BE WITHOUT WARRANTY WHATSOEVER, EXPRESS, STATUTORY, OR IMPLIED
AS TO TITLE, DESCRIPTION, PHYSICAL CONDITION OF THE PROPERTY (INCLUDING,
WITHOUT LIMITATION, THE ENVIRONMENTAL CONDITION OF THE PROPERTY), QUALITY,
VALUE, FITNESS FOR PURPOSE, MERCHANTABILITY, OR OTHERWISE except that SHELL
shall warrant title to the SHELL Property by, through and under SHELL, but not
otherwise.  With respect to the PLAINS Property, SHELL acknowledges that
certain obligations under the Murphy/Callon Agreement must be satisfied in
order to earn an interest in the title to the property covered thereby, that
PLAINS shall have no responsibility whatsoever for any obligations under the
Murphy/Callon Agreement, and that PLAINS makes no representations or warranties
whatsoever for any obligations under the Murphy/Callon Agreement, and that
PLAINS makes no representations or warranties whatsoever, express, statutory,
or implied with respect to the property covered by such agreement.  Grantee
shall satisfy itself, prior to the Closing, as to the type, condition, quality,
and extent of the property and property interests which comprise the PROPERTY
it is receiving pursuant to this AGREEMENT and under this sale.  GRANTEE shall
have the right of full substitution and subrogation to any and all rights and
actions of which GRANTOR has or may have against any and all preceding owners
or vendors of the PROPERTY other than affiliates of GRANTOR.

                 (b)      Acknowledgments of GRANTEE at Closing.   By closing
on the transaction provided for in the AGREEMENT, GRANTEE shall be deemed to
have acknowledged and does acknowledge and admit that: (i) GRANTEE has been
given the opportunity to adequately inspect





                                                                               7
<PAGE>   12



the PROPERTY for all purposes prior to Closing; (ii) GRANTEE is aware that the
PROPERTY has been used for the exploration, development, production, treating,
and transporting of oil and gas, and that physical changes may have occurred as
a result of such use and that GRANTOR has disclosed, and GRANTEE is further
aware, that there exists the possibility that there could have occurred from
such use one or more releases of hazardous substances or releases of Chemical
Substances [as defined in subsection 18(c)(3) below] into, or other pollution
or contamination of or into, the ambient air, surface water, groundwater, or
land surface and subsurface strata of any real property included in the
PROPERTY and of contiguous, or a series of contiguous, real properties not
associated with the PROPERTY; (iii) GRANTEE has entered into this AGREEMENT on
the basis of its own investigation of the physical condition of the PROPERTY
and the land related thereto (including the environmental condition of the
PROPERTY); (iv) GRANTEE, with full knowledge of the foregoing and after
conducting the above-described investigation and evaluation, IS ACQUIRING THE
PROPERTY ON A "WHERE IS" AND "AS IS" BASIS except as otherwise noted in 7(a)
above; and GRANTEE, by acquiring the PROPERTY on a "WHERE IS" and "AS IS"
basis, waives any other rights of indemnification, contribution, or recourse it
may have against or from GRANTOR with respect to the condition of the PROPERTY,
including, without limitation, the environmental condition of the PROPERTY and
damage to natural resources associated with the PROPERTY; (v) GRANTEE shall
further acknowledge that it has received from GRANTOR prior to Closing a
written notice pursuant to section 25359.7(a) of the California Health and
Safety Code and that a copy of such written notice is attached hereto as
SCHEDULE "11(b)"; and (vi) GRANTEE shall further acknowledge that it has had
the full opportunity to review and is aware of the matters with respect to the
PROPERTY which are identified in SCHEDULE "11(c)" attached hereto.





                                                                               8
<PAGE>   13



         8.      INDEPENDENT EVALUATION.  GRANTEE has made an independent
evaluation of the PROPERTY and acknowledges that GRANTOR has made no statements
or representations concerning the present or future value of the anticipated
income, costs, or profits, if any, to be derived from the PROPERTY or the
quantity and quality of any oil and gas or other minerals that may be produced
from the PROPERTY and THAT GRANTOR DOES NOT IMPLIEDLY OR EXPRESSLY WARRANT
DESCRIPTION, TITLE, VALUE, QUALITY, PHYSICAL CONDITION OF THE PROPERTY
(INCLUDING, WITHOUT LIMITATION, THE ENVIRONMENTAL CONDITION OF THE PROPERTY),
MERCHANTABILITY, OR FITNESS FOR PURPOSE OF ANY OF THE PROPERTIES OR THE WELLS,
EQUIPMENT, PIPELINES FACILITIES, OR OTHER PROPERTY LOCATED THEREON OR USED IN
CONNECTION THEREWITH.  GRANTEE further acknowledges that, in entering into this
AGREEMENT, it has relied solely upon its independent examination of the
PROPERTY and public records relating to the PROPERTY and its independent
estimates, computations, evaluations, reports, and studies based thereon.  All
information and data furnished to GRANTEE by GRANTOR is believed to be accurate
and correct to the best of GRANTOR's knowledge without investigation; however,
GRANTOR makes no warranty or representation as to the accuracy or correctness
of any information furnished to GRANTEE. Any reliance GRANTEE makes on such
information is at GRANTEE's sole risk.  GRANTEE acknowledges that it is aware
that accounting reports, files, and records made available to GRANTEE during
the Review Period specified in Section 6 hereof or otherwise furnished to or
made available to GRANTEE for review may not incorporate all revenue and cost
data up, to, and through the date of the accounting reports, files, records, or
information provided, and further inquiry





                                                                               9
<PAGE>   14



by GRANTEE may be required to obtain such revenue and cost data.  GRANTOR will
provide a copy of such revenue and cost data upon written request of the
GRANTOR.  Notwithstanding the foregoing, SHELL acknowledges that all
information regarding the PLAINS Property has been furnished to SHELL by
Murphy/Callon and that PLAINS shall have no responsibility whatsoever with
respect to the accuracy or completeness of such information.

         9.      CONSENTS; PREFERENTIAL RIGHTS.

                 (a)      [omitted]

                 (b)      [omitted]

         10.     TITLE.  SHELL acknowledges that PLAINS has never held title to
the property covered by the Murphy/Callon Agreement and has no records or
information regarding title to such property and accordingly, that PLAINS makes
no representations or warranties whatsoever, express, statutory or implied with
respect to such property.  The following provisions of this Paragraph 10 relate
to the SHELL Property only.

                 (a)      Title Examination.  PLAINS assumes the risk of
description and title to the SHELL Property and has satisfied itself with
respect thereto.  SHELL has made available to PLAINS for examination by PLAINS
such title information and abstract coverage as were in its and its affiliates'
files.

                 (b)      Significant Title Defect.

                          (1)     [omitted]

                          (2)     With regard to the case styled Kerry Moremann
vs. A.A. Cantin, et al. Case No. CV 0880364, Superior Court of the County of
San Luis Obispo, the parties hereby agree that SHELL shall be responsible for
the defense of this litigation, including the payment of attorney





                                                                              10
<PAGE>   15



fees, and shall be responsible for losses, penalties, fines, damages or other
expenses associated with or arising out of the litigation, including but not
limited to the loss of any mineral interest or leasehold interest in the lands
subject to the litigation.  Each party shall cooperate with each other in the
litigation and SHELL shall keep PLAINS apprised of the status of the
litigation, including but not limited to furnishing PLAINS with copies of the
pleadings and other substantive court filings.  For any settlement which
requires PLAINS' consent, PLAINS will not unreasonably withhold its consent.

                 (c)      Personal Property Inventory List. [omitted]

         11.     REPRESENTATIONS BY SHELL.  SHELL represents to PLAINS, each of
which representations shall survive Closing, that as of the date of the
AGREEMENT and as of Closing:

                 (a)      Due Organization.  SHELL Land & Energy Company is a
corporation duly organized, validly existing, and in good standing under the
laws of the State of Delaware.  SHELL Western E&P Inc. is a corporation duly
organized, validly existing, and in good standing under the laws of the State
of Delaware.

                 (b)      Power.  SHELL has all requisite power and authority
to carry on its business as presently conducted, to enter into the AGREEMENT,
to perform its obligations under the AGREEMENT. The consummation of the
transactions contemplated by the AGREEMENT will not violate, nor be in conflict
with, (i) any provision of its charter, operating agreement, or bylaws, or (ii)
any agreement or instrument to which it is a party or is bound (except for
preferential rights to purchase and required Third Party consents to
assignment, if any).

                 (c)      Duly Executed.  The AGREEMENT has been duly executed
and delivered on behalf of SHELL, and, at Closing, all documents and
instruments required hereunder to be executed and delivered by it shall have
been duly executed and delivered.





                                                                              11
<PAGE>   16



                 (d)      No Litigation.  There are no pending, or to the best
of SHELL's knowledge, threatened claims, lawsuits, administrative proceedings,
or governmental investigations or inquiries involving SHELL's right to
consummate the sale contemplated hereunder or which have involved the Property,
except those claims, lawsuits, administrative proceedings, and governmental
investigations and inquires that SHELL has disclosed on attached Schedule
"1(k)" and the Moremann vs. Cantin case described in Section 10(b) (2) above.

                 (e)      No Liens or Royalty Obligations.  Except as disclosed
to PLAINS in writing on Exhibit "J", SHELL, to the best of its knowledge, is
not aware of any liens, charges, encumbrances, outstanding and past due
royalties or rentals under the leases and agreements covering the Property.

         12.     REPRESENTATIONS OF PLAINS.  PLAINS represents to SHELL, each
of which representations shall survive Closing, that as of the date of the
AGREEMENT and as of Closing:

                 (a)      Due Organization.  Plains Resources Inc. is a
corporation duly organized, validly existing, and in good standing under the
laws of the state of Delaware and is duly qualified to do business in
California.

                 (b)      Power.  PLAINS has all requisite corporate power and
authority to carry on its business as presently conducted, to enter into the
AGREEMENT, to purchase the PROPERTY on the terms described in the AGREEMENT,
and to perform its other obligations under the AGREEMENT.  The consummation of
the transactions contemplated by the AGREEMENT will not violate, nor be in
conflict with, (i) any provision of its charter or bylaws or formation and
governing documents or (ii) any agreement or instrument to which it is a party
or is bound.





                                                                              12
<PAGE>   17



                 (c)      Duly Executed.  The AGREEMENT has been duly executed
and delivered on behalf of PLAINS, and, at Closing, all documents and
instruments required hereunder to be executed and delivered by it shall have
been duly executed and delivered and the transactions contemplated hereby shall
have been duly and validly authorized by all requisite corporate action.

                 (d)      No Litigation.  There are no pending, or to the best
of PLAINS' knowledge, threatened claims, lawsuits, administrative proceedings,
or governmental investigations or inquiries involving PLAINS' right to
consummate the sale contemplated hereunder or which have involved the property
set forth on Exhibit "A-3", except those claims, lawsuits, administrative
proceedings, and governmental investigations and inquires that PLAINS has
disclosed to SHELL on attached Schedule "1(n)".

                 (e)      Hazardous Releases.  PLAINS has received and reviewed
Schedules 11(b) and(c) attached hereto.

                 (f)      Environmental Conditions.  PLAINS has received and
reviewed Schedule "1(m)" attached hereto.

         13.     SHELL'S CONDITIONS.

                 (a)      Representations True. [omitted]

                 (b)      No Pending Suits. [omitted]

                 (c)      No Act of Termination. [omitted]

                 (d)      H-S-R. [omitted]

         14.     PLAINS' CONDITIONS. [omitted]

                 (a)      Representations True. [omitted]

                 (b)      No Pending Suits. [omitted]





                                                                              13
<PAGE>   18



                 (c)      No Act of Termination. [omitted]

                 (d)      H-S-R. [omitted]

                 (e)      No Material Change. [omitted]

         15.     OPERATIONS AND PRODUCTION PRIOR TO CLOSING:  SHELL PROPERTY

                 (a)      Operations Prior to Closing. [omitted]

                 (b)      Closing Settlement. At Closing, SHELL shall pay to
PLAINS a Closing Settlement herein defined as the sum of $1,060,483.00 which
reflects the mutually agreed upon net cash flow before tax generated by the
SHELL Property between April 1, 1997 and October 31, 1997.  Notwithstanding the
above, the net cash flow before tax generated by the SHELL Property excludes
the costs and expenses associated with the projects described in section 25(p)
and 25(q) herein.  Both SHELL and PLAINS agree that the Closing Settlement sum
contained in this section 15(b) shall also serve as the entire Closing
Settlement between the Parties, and no post-closing settlement will be provided
for herein.

                 (c)      Interim Accounting, Payment and Collection Services.
[omitted]

         16.     TAXES, COSTS, AND FEES.

                 (a)      Taxes and Fees. GRANTEE shall pay to GRANTOR at
Closing, in addition to and separate from the Closing Settlement, an amount
equal to all state and local taxes payable by GRANTOR on the transfer of
ownership of any tangible personal property calculated at the then-current
rates. GRANTEE shall indemnify GRANTOR and hold GRANTOR harmless from any
liability, including, without limitation, penalties, interest, and attorney's
fees arising out of GRANTEE's failure to pay to GRANTOR at Closing, in addition
to and separate from the Closing Settlement, the amount equal to all state and
local taxes payable by GRANTOR on the transfer of





                                                                              14
<PAGE>   19



ownership of any tangible personal property. GRANTEE shall pay all costs
associated with documentary transfer taxes, other transfer taxes, and any
recording costs assessed by any federal, state, county, or other governmental
offices or other transfer fees, and shall indemnify and hold GRANTOR harmless
for such transfer taxes, costs, and fees.

                 (b)      No Brokers.  Each Party shall pay and indemnify and
hold the other Party harmless from any commission or brokerage fee it has
incurred in connection with this transaction.

         17.     OPERATIONS BY GRANTEE.

                 (a)      Compliance with Laws.  GRANTEE shall comply with all
applicable laws, ordinances, rules and regulations, orders, terms of permits,
and authorizations of any governmental body which may have jurisdiction with
respect to the PROPERTY to be transferred hereunder (including, without
limitation, the filing with such governmental bodies of any and all compliance
reports, notices, or other compliance documents which are due after the Closing
Date regardless of the period covered by such reports, notices, or documents)
and shall promptly obtain and maintain all permits and bonds required by public
authorities in connection with the PROPERTY, including, without limitation, the
bond required by California Public Resources Code, Section 3202, or similar
statutes applicable to the PLAINS Property, if applicable, for wells which have
not produced oil or gas or have not been used as injectors, for a period of
five (5) years prior to Closing.  Further to this obligation, with respect to
the SHELL Property SHELL and PLAINS shall sign (or PLAINS shall cause the
entity which is to assume operation to sign), prior to Closing, a notice or
notices in the form attached hereto as SCHEDULE "21(a)" and within the time
prescribed by the California Department of Conservation, Division of Oil and
Gas, as required by California Resources Code, Sections 3201 and 3202, if
applicable, giving notice of the transfer from SHELL to PLAINS'





                                                                              15
<PAGE>   20



designated operator of each well, including each idle well, currently operated
by SHELL or its predecessors which is to be transferred under this AGREEMENT.
The signed notice shall designate PLAINS or its designated operator as the
current operator of each such well.

                 (b)      Assumption of Obligations.  Upon Closing, GRANTEE
shall assume, and agree to perform, at GRANTEE's sole cost and expense, whether
the obligation was incurred prior to or after the Closing Date, (i) all
obligations and implied covenants of GRANTOR relating to the PROPERTY (whether
such obligations and covenants are to a lessor, a governmental body, or any
other person or entity), including, but not limited to, (1) any obligations
arising in respect to the plugging and abandonment of all existing wells
(whether or not such wells are active, inactive, idle, or have been previously
abandoned as of the Effective Date), (2) any obligations to file or submit
compliance reports, notices, and documents required by governmental bodies, (3)
the removal of related oil and gas equipment including, without limitation,
pipelines, sumps, foundations, and other facilities, whether the existence of
same is known or unknown to the Parties at Closing, and (4) the complete and
lawful restoration and reclamation of the lands used in connection with such
wells and related equipment, pipelines, sumps, and other facilities in
compliance with all federal, state, and local laws, rules and regulations,
including, without limitation, the California Department of Conservation,
Division of Oil and Gas, with respect to such plugging and abandonment, removal
and restoration and reclamation of associated lands; (ii) all obligations under
licenses, permits, franchises, easements, and rights-of-way associated with or
included in the PROPERTY; (iii) any obligations with respect to the
reabandonment of previously abandoned wells on lands included in the PROPERTY;
(iv) any obligations with respect to Deserted Wells as defined in California
Public Resources Code, Section 3237, and (v) remediation and cleanup with
respect to those matters





                                                                              16
<PAGE>   21



identified on SCHEDULE "11(c)" attached hereto.  The assumption of obligations
and liabilities by GRANTEE shall include GRANTOR's obligations and liabilities
with respect to net proceeds from production attributable to interests in the
PROPERTY as currently held in suspense because of a lack of identity or address
of owners, title questions, change of ownership or similar reasons (as
identified on SCHEDULE "18(b)" attached hereto).  As set forth in section
18(a), GRANTEE shall defend, indemnify and hold GRANTOR harmless with respect
to the performance or failure to perform of GRANTEE's obligations under this
section 17.

         18.     INDEMNIFICATION.  Capitalized terms used in this section 18
which are not defined elsewhere in this AGREEMENT are defined in subsection
18(c) below.

                 (a)      General Indemnity by GRANTEE.  To the fullest extent
permitted by law, but no further, GRANTEE shall indemnify and hold harmless
GRANTOR, its Affiliates and their officers, directors, employees, and agents,
from any and all Claims for which a Claim Notice is delivered to GRANTEE and
such Claims directly or indirectly arise or result from or are caused by the
use, operation, maintenance, occupation, ownership, or abandonment of the
PROPERTY either prior to or after the Closing Date even though such Claims may
have been contributed to or caused by the negligence or fault of GRANTOR prior
to Closing.  GRANTEE further covenants and agrees to defend any suits brought
against GRANTOR, its Affiliates or their respective officers, directors,
employees, and agents, on account of any such Claims indemnified hereunder and
to pay or discharge the full amount or obligation of such Claims incurred by,
accruing to, or imposed on GRANTOR, its Affiliates or their respective
officers, directors, employees, and agents, resulting from any such suit or
suits.  In addition, GRANTEE shall pay to GRANTOR, its Affiliates or their
respective officers, directors, employees, or agents, as applicable, all
reasonable attorneys' fees





                                                                              17
<PAGE>   22



incurred by GRANTOR, its Affiliates or their respective officers, directors,
employees, or agents, as applicable, in enforcing GRANTEE's indemnity in this
subsection 18(a).

                 (b)      Environmental Indemnity by GRANTEE. To the fullest
extent permitted by law, but no further, GRANTEE shall indemnify and hold
harmless GRANTOR, its Affiliates and their respective officers, employees, and
agents, from and against any and all Environmental Claims or Environmental
Cleanup Liability for which a Claim Notice is delivered to GRANTEE and which
Arises directly or indirectly from the use, operation, maintenance, occupation,
ownership or abandonment of the PROPERTY either prior to or after the Closing
Date, with respect to any Environmental Claim or Environmental Cleanup
Liability initially made against or sought to be imposed upon GRANTOR, its
Affiliates or their respective officers, directors, employees and agents even
though caused, or contributed to, by the negligence or fault of GRANTOR,
including any such Environmental Claims or Environmental Cleanup Liability
caused by the willful misconduct or gross negligence of GRANTOR.  GRANTEE
further covenants and agrees to defend any suits or administrative proceedings
brought against GRANTOR, its Affiliates and their respective officers,
directors, employees, and agents on account of any such Environmental Claims or
Environmental Cleanup Liability and to pay or discharge the full amount or
obligation of such Environmental Claims or Environmental Cleanup Liability
incurred by, accruing to, or imposed on GRANTOR, its Affiliates, or their
respective officers, directors, employees, or agents, as applicable, resulting
from any such suit or suits or any amounts resulting from the settlement or
resolution of such suit or suits or administrative proceedings.  In addition,
GRANTEE shall pay to GRANTOR, its Affiliates, or their respective officers,
directors, employees, or agents, as applicable, all attorneys' fees incurred by
GRANTOR, its Affiliates, or their respective officers, directors, employees, or
agents, as applicable, by GRANTOR in enforcing GRANTEE's indemnity in this
subsection 18(b).





                                                                              18
<PAGE>   23



                 (c)      Definitions.  For purposes of this Agreement:

                          (1)     "Affiliate" shall mean a Party's "Parent
Company" and "Affiliated Companies."  "Parent Company," "Affiliated Companies,"
and "Controlling Interest" shall have the following meanings:

                                 (i)       A Party's "Parent Company" shall
mean an entity having a "Controlling Interest" in such Party;

                                (ii)       A Party's "Affiliated Companies"
shall mean any and all entities in which the Party or the Parent Company of
such Party has a direct or indirect "Controlling Interest;" and

                               (iii)       "Controlling Interest" shall mean a
legal or beneficial ownership of fifty percent (50%) or more of the voting
stock or other voting rights in an entity.

                          (2)     "Arises."  An Environmental Claim or
Environmental Cleanup Liability shall be deemed to Arise upon (i) each
discrete, operationally-related Release of a Chemical Substance, as measured on
a daily basis, or (ii) each discrete, operationally-related occurrence of
pollution, contamination, or migration, as measured on a daily basis.

                          (3)     "Chemical Substances" shall mean any chemical
substance, including, but not limited to, any sort of pollutants, contaminants,
chemicals, raw materials, intermediates, products, industrial, solid, toxic, or
hazardous substances, materials, wastes, or petroleum products, including crude
oil or any component thereof.

                          (4)     "Claims" shall mean any and all claims,
demands, loss, liability, liens, demands, judgments, settlements, suits, causes
of action, fines, penalties, compliance, costs, and any





                                                                              19
<PAGE>   24



costs, expenses, and fees associated with the investigation, defense, and
resolution of the foregoing, including without limitation, reasonable
attorney's fees.  Claims may be based on any theory of tort, contract, strict
liability, statutory liability (including, without limitation, fines,
penalties, obligations, or requirements), or any other basis for liability and
shall include, without limitation, any Claims arising, occurring, or resulting
from, related to, or based on the injury, disease, or death of any persons
(including, without limitation, the Indemnifying Party's employees, agents and
representatives), or damage to, loss or destruction of any property, real or
personal (including, without limitation, the Indemnifying Party's property).

                          (5)     "Claim Notice" shall mean a notice delivered
to either Party, in writing, that the other Party has received a claim or
demand from a Third Party or been served with process by or on behalf of a
Third Party asserting Claims, Environmental Claims, or Environmental Cleanup
Liability which is indemnified hereunder.

                          (6)     "Environmental Claim" shall mean any claim,
demand, action, suit, or proceeding for the injury, disease, or death of any
person (including, without limitation, the Indemnifying Party's employees,
agents, and representatives), property damage, damage to the environment, or
damage to natural resources made, asserted, or prosecuted by or on behalf of
any Third Party (whether based on negligent acts or omissions, statutory
liability, or strict liability without fault or otherwise) arising or alleged
to arise under any Environmental Law. Environmental Claim includes any damages,
settlement amounts, fines, and penalties assessed or costs of complying with
any orders or decrees of courts, administrative tribunals, or other
governmental entities (other than such compliance costs related to
Environmental Cleanup Liability) associated with resolving such claims,
demands, actions, suits, or proceedings and any costs, expenses, and fees,
including,





                                                                              20
<PAGE>   25



without limitation, reasonable attorney's fees incurred in the investigation,
defense, and resolution of such claims, demands, actions, suits, and
proceedings.

                          (7)     "Environmental Cleanup Liability" shall mean
any cost or expense of any nature whatsoever incurred (in order to comply with
the provisions of any Environmental Law or the provisions of any order or
decree of any court or administrative or regulatory tribunal or agency
enforcing any Environmental Law) to contain, remove, remedy, respond to, clean
up, or abate any Release of Chemical Substances or other contamination or
pollution of the air, surface water, groundwater, land surface, or subsurface
strata related to the operation, use, maintenance and ownership of the
PROPERTY, whether such Release, contamination or pollution is located on,
within, under, or above real property included in the PROPERTY ("on site") or
is located off site, including, but not limited to, any Release of Chemical
Substances or other contamination or pollution arising out of or resulting from
the manufacture, generation, formulation, processing, labeling, distribution,
introduction into commerce, for on site or off site use, treatment, handling,
storage, disposal, or transportation of any Chemical Substances.  Environmental
Cleanup Liability includes, without limitation, any judgments, damages,
settlements, costs, or expenses (including, without limitation, attorneys',
consultants', and experts' fees and expenses) incurred with respect to (i) any
investigation, study, assessment, legal representation, cost recovery by a
governmental agency or Third Party, or monitoring or testing in connection
therewith, (ii) the PROPERTY as a result of actions or measures necessary to
implement or effectuate any such containment, removal, remediation, response,
cleanup, or abatement, and (iii) the resolution of such liabilities.

                          (8)     "Environmental Law" means any statutes,
rules, regulations, controlling judicial decisions, or legal requirements
relating to or regulating the pollution, protection,





                                                                              21
<PAGE>   26



or cleanup of the environment or damage to or remediation of damage to real
property and natural resources (including, but not limited to, ambient air,
surface water, groundwater, and land surface or subsurface strata) including,
without limitation, legal requirements contained in the Comprehensive
Environmental Response, Compensation and Liability Act of 1980, 42 U.S.C.
Section  9601 et seq., as amended (CERCLA); the Resources Conservation and
Recovery Act of 1976, 42 U.S.C. Section  6901, et seq., as amended (RCRA); the
Superfund Amendments and Reauthorization Act of 1986, Pub. L. 99- 499, as
amended (SARA); the Clean Air Act, 42 U.S.C. Section  7401, et seq., as
amended; Federal Water Pollution Control Act, 33 U.S.C. Section  2601 et seq.,
as amended; National Environmental Policy Act, 42 U.S.C. Section  4321, et
seq., as amended (NEPA); and the Safe Drinking Water Act, 42 U.S.C., Section
300 j-l, et seq., as amended; and/or any other federal, state, or local laws,
statutes, ordinances, rules, regulations, or orders (including decisions of any
court or administrative body) relating to the pollution, protection, or cleanup
of the environment as specified above.  Environmental Law shall also mean the
Toxic Substance Control Act, 25 U.S.C. Section  1502, et seq., as amended
(TOSCA) and/or any other federal, state (including, without limitation, laws
with respect to trespass, nuisance, and other torts or similar legal theories
which may be applied to establish liability or responsibility for Environmental
Cleanup or Environmental Claims) or local laws, statutes, ordinances, rules,
regulations, or orders (including decisions of any court or administrative
body) relating to (i) release, containment, removal, remediation, response,
cleanup, or abatement of any sort of Chemical Substance, (ii) the manufacture,
generation, formulation, processing, labeling, distribution, introduction into
commerce, use, treatment, handling, storage, disposal, or transportation of any
Chemical Substance, (iii) exposure of persons, including employees of GRANTOR
or GRANTEE, to any Chemical Substance and other occupational safety or health





                                                                              22
<PAGE>   27



matters, or (iv) the physical structure or condition of a building, facility,
fixture, or other structure, including, without limitation, those relating to
the management, use, storage, disposal, cleanup, or removal of asbestos,
asbestos- containing materials, polychlorinated biphenyls, or any other
Chemical Substance.

                          (9)     "Release" shall mean any spilling, leaking,
pumping, pouring, emitting, emptying, discharging, escaping, leaching, dumping,
or disposing of any Chemical Substance into the environment (including, but not
limited to, the ambient air, surface water, groundwater, and land surface or
subsurface strata) of any kind whatsoever (including also the abandonment or
discarding of barrels, containers, tanks, or other receptacles containing or
previously containing any Chemical Substance).

                          (10)    "Third Party" shall mean any person (other
than a Party or its Affiliates) including, without limitation, any such natural
person, business entity (corporation, partnership, trust, sole proprietorship,
or other business entity), any federal, state, or local governmental entity,
agency, or administrative body, employee of GRANTEE or of GRANTOR, former
employee of GRANTEE or of GRANTOR, or their respective legal representatives,
heirs, beneficiaries, or estates.

                 (d)      Indemnified Party's Participation.  Any indemnified
Party shall have the right at all times, if it so elects and without relieving
the indemnifying Party of its obligations to defend hereunder, to participate
in the preparation for and conducting of any hearing or trial related to these
indemnification provisions, as well as the right to appear on its own behalf at
any such hearing or trial.  Any such participation or appearance by an
indemnified Party shall be at its sole cost and expense.





                                                                              23
<PAGE>   28



                          An indemnified Party shall not execute a consent
order nor accept any settlement regarding an indemnified matter without the
indemnifying Party's prior written approval.  The indemnified Party shall
cooperate fully with the indemnifying Party in the defense of any matter
hereunder by the indemnifying Party and shall take those actions reasonably,
within its power to take which are reasonably necessary to preserve any legal
defenses to indemnified matters hereunder until the indemnifying Party has
assumed the defense of the matter.

                 (e)      GRANTEE'S Indemnification and Financial Obligations
to GRANTOR to Survive Assignment.  All of GRANTEE's obligations hereunder,
including, but not limited to, those contained in Sections 17 and 18 hereof,
shall continue as between GRANTEE and GRANTOR even though GRANTEE assigns its
interest in the PROPERTY or in this AGREEMENT to another party unless GRANTOR
specifically consents in writing to the assignment of these obligations.
GRANTOR shall have full and unfettered discretion to approve or disapprove the
release of GRANTEE from such obligations in connection with an assignment, and
shall in no event be required to approve the assignment of such obligations to
a party less creditworthy than GRANTEE.

                 (f)      SHELL Acknowledgment.  SHELL acknowledges that with
respect to the PLAINS Property, PLAINS shall not have any obligations nor incur
any liabilities under or in connection with the Murphy/Callon Agreement or the
property which is subject thereto and that in accordance with this Paragraph 18
SHELL will indemnify and hold PLAINS harmless with respect to any Claims
resulting from or arising in connection with PLAINS having been a party to the
Murphy/Callon Agreement.

         19.     EXISTING CONTRACTS.

                 (a)      Assumption of Contracts.  The exchange contemplated
hereunder shall be 



                                                                              24
<PAGE>   29



made subject to any and all existing operating agreements, unit agreements, gas
purchase agreements, and gas processing agreements, as well as any and all other
agreements, permits, franchises, leases, licenses, easements, and rights-of-way
to which the PROPERTY is subject as identified on attached Exhibit "L".  To the
extent such agreements may be assigned and delegated, GRANTEE shall assume and
be responsible for all obligations of GRANTOR accruing under such agreements.
If such agreements may not be assigned or delegated, GRANTOR may, at its sole
discretion, perform such agreements on behalf of GRANTEE and GRANTEE shall
promptly, upon notice, reimburse GRANTOR for its respective costs, expenses, and
obligations incurred in performing such agreements.

                 (b)      SHELL acknowledges that PLAINS has no information nor
duty to inquire regarding any agreements or encumbrances relating to the
property covered by the Murphy/Callon Agreement and that SHELL shall indemnify
and hold PLAINS harmless with respect to any Claims relating to or arising in
connection with such any such agreements or encumbrances.

         20.     NOTICES.  All notices and communications required or permitted
under this AGREEMENT shall be in writing, delivered to or sent by U. S. Mail or
nationally recognized commercial courier service, postage or delivery charges
prepaid, or by telecopy, addressed as follows (or such other address as may be
specified by ten (10) days prior written notice to the other Party):

                                  SHELL

                                  Shell Land & Energy Company, and
                                  Shell Western E&P Inc.
                                  c/o Shell Exploration & Production Company
                                  910 Louisiana St.
                                  P.O. Box 2463
                                  Houston, Texas 77252
                                  Attention: Bill Bliss, Investor Relations
                                  Telecopier: (713) 241-4764





                                                                              25
<PAGE>   30


                          With a copy to:

                                  Aera Energy LLC
                                  P. O. Box 11164
                                  Bakersfield, CA  93389-1164
                                  Attention:  Strategic Development Group
                                  Telecopier No.  (805) 326-5490

                                  PLAINS

                                  C/O STOCKER RESOURCES INC.
                                  Attention:  Larry Morton
                                  5640 South Fairfax Avenue
                                  Los Angeles CA  90056
                                  Telecopier No. (213) 296-9375

                          With a copy to:

                                  Plains Resources
                                  1600 Smith Street
                                  Houston, Texas 77002
                                  Attention: Don Trimble
                                  Telecopier No.  (713) 654-1523

Notice shall be deemed to have been duly given when delivered to or sent to the
other Party in the manner prescribed herein and actually received by the Party
to whom the notice is given.

         21.     PARTIES IN INTEREST.  Subject to subsection 25(d) below, this
AGREEMENT shall inure to the benefit of and be binding upon SHELL and PLAINS
and their respective successors and assigns. However, no assignment by any
Party shall relieve any Party of any duties or obligations under this
AGREEMENT.

         22.     COMPLETE AGREEMENT.  When executed by the authorized
representatives of SHELL and PLAINS, this AGREEMENT, together with the executed
copies of the exhibits hereto and documents referred to herein, shall supersede
all prior written or oral and all contemporaneous oral agreements and
understandings between the Parties, including, without limitation, all and any





                                                                              26
<PAGE>   31



bid solicitation, bid offer, and bid acceptance letters, and shall constitute
the complete agreement between the Parties regarding the purchase and sale of
the PROPERTY.

         23.     SHELL ACTION. [omitted]

         24.     APPLICABLE LAW.  THIS AGREEMENT, OTHER DOCUMENTS EXECUTED AND
DELIVERED PURSUANT HERETO, AND THE LEGAL RELATIONS BETWEEN THE PARTIES WITH
RESPECT TO THIS AGREEMENT, SHALL BE GOVERNED AND CONSTRUED IN ACCORDANCE WITH
THE LAWS OF THE STATE OF TEXAS WITHOUT REGARD TO RULES CONCERNING CONFLICTS OF
LAWS; PROVIDED THAT THE VALIDITY OF THE VARIOUS CONVEYANCES TRANSFERRING TITLE
TO REAL PROPERTY AND REAL PROPERTY INTERESTS UNDER THIS AGREEMENT SHALL BE
GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE JURISDICTION IN
WHICH SUCH REAL PROPERTY OR REAL PROPERTY INTERESTS ARE LOCATED.

         25.     MISCELLANEOUS PROVISIONS.

                 (a)      Captions.  Captions have been inserted for reference
purposes only and shall not define or limit the terms of this AGREEMENT.

                 (b)      Partial Invalidity.  If any provision of this
AGREEMENT is held invalid, such invalidity shall not affect the remaining
provisions.

                 (c)      Modification.  This AGREEMENT cannot be modified or
amended except by a written instrument duly executed by SHELL and PLAINS.

                 (d)      Assignment.  Neither SHELL nor PLAINS, without the
prior written consent of the other Party, shall assign any right or obligation
under this AGREEMENT, or attempt to





                                                                              27
<PAGE>   32



delegate any duty to be performed under this AGREEMENT, except that either
party may make such an assignment and/or delegation to an Affiliate without the
consent of the other party.  Consent to assign shall not be unreasonably
withheld by either Party.  Any attempted assignment or delegation without such
consent shall be void and of no effect. No assignment or delegation shall
release any party from its obligations under this Agreement.

                 (e)      Counterparts.  This AGREEMENT may be executed in any
number of counterparts, each of which shall be deemed an original instrument,
but all of which together shall constitute but one and the same instrument.

                 (f)      Expenses.  Except as otherwise expressly provided
herein, all expenses incurred by each Party in connection with the transaction
contemplated herein, including, without limitation, attorney's fees, are for
the account of the Party incurring the same and the Party incurring such
expenses shall defend, indemnify, and hold harmless the other Party from and
against such expenses.

                 (g)      Signs.  SHELL shall have the right, but not the
obligation, to remove all of SHELL's signs, placards, notices, or other posted
documents or information, and any other like property which refers to SHELL's
ownership of the SHELL Property or responsibility for the operations conducted
thereon.

                 (h)      Press Releases.  No information in connection with
this exchange shall be released to the public, including, without limitation,
through press releases, without the express written permission of SHELL, unless
required by applicable federal, state or local laws.

                 (i)      No Recording.  This AGREEMENT shall not be recorded
or filed by any Party or their successors or assigns, in or with any public or
governmental office, officer, agency, or records repository without the prior
written consent of the other Party.





                                                                              28
<PAGE>   33



                 (j)      Survival.  All representations, indemnifications,
covenants, obligations, and promises of the Parties set forth in this AGREEMENT
shall survive Closing.  All documents conveying, transferring, or assigning the
PROPERTY shall incorporate by reference the terms and conditions of this
AGREEMENT.

                 (k)      Exhibits and Schedules.  The Exhibits and Schedules
listed below are attached to this AGREEMENT:

                          EXHIBIT "A-1"            The SHELL Property

                          EXHIBIT "A-2"            The PLAINS Property and
                                                   Waiver(s)

                          EXHIBIT "A-3"            Preferred Stock and Warrant

                          EXHIBIT "B-1"            SHELL Assignment and
                                                   Conveyance and Grant Deed

                          EXHIBIT "B-2"            Assignment

                          EXHIBIT "C"              Personal Property Agreement
                                                   and Bill of Sale

                          EXHIBIT "D"              GRANTOR Non-foreign
                                                   Affidavit

                          EXHIBIT "E"              Indemnification Agreement

                          EXHIBIT "F"              GRANTEE Non-foreign
                                                   Affidavit

                          EXHIBIT "J"              Specifically Listed Liens,
                                                   Encumbrances, Past Due
                                                   Royalties and Rentals

                          EXHIBIT "K"              Confidentiality Agreement

                          EXHIBIT "L"              Specifically Listed
                                                   Contracts

                          SCHEDULE "1(e)"          Specifically Listed
                                                   Rights-of-Way, etc.





                                                                              29
<PAGE>   34



                          SCHEDULE "1(g)"          Specifically Listed Salt
                                                   Water Disposal and Water
                                                   Wells

                          SCHEDULE "1(h)"          Specifically Listed
                                                   Facilities and Equipment

                          SCHEDULE "1(k)"          SHELL Threatened Litigation

                          SCHEDULE "1(m)"          SHELL Environmental
                                                   Conditions

                          SCHEDULE "1(n)"          PLAINS Threatened Litigation

                          SCHEDULE "11(b)"         Notice of Releases

                          SCHEDULE "11(c)"         List of Oil Spill Reports
                                                   and Consultant's Reports

                          SCHEDULE "12(d)"         Pending Litigation

                          SCHEDULE "18(b)"         Suspense Items

                          SCHEDULE "21(a)"         Notice of Well Transfers

                          SCHEDULE "25"(r)         Service Contract

                          SCHEDULE "26"            Terms of Call on Production

                 (l)      Time of Essence.  Time is of the essence in the
performance of this AGREEMENT.

                 (m)      H-S-R.  If either GRANTOR or GRANTEE determine that
the Hart-Scott-Rodino Antitrust Improvements Act of 1976 is applicable to this
transaction, then the Parties which are required to file shall file with the
Federal Trade Commission and the Department of Justice the required
notifications, reports, and supplemental information to comply in all respects
with the requirements of said Act.

                 (n)      No Partnership.  Nothing contained in this AGREEMENT
shall be deemed to create a joint venture, partnership, tax partnership, or
agency relationship between the Parties.





                                                                              30
<PAGE>   35



                 (o)      File Transfers.  Within a reasonable time after
Closing, but no later than 45 days after Closing, SHELL will transfer to
PLAINS, subject to SHELL's continuing right of access as hereinafter set forth,
the following original SHELL files, records, documents, and data relating to
the SHELL Property: oil, gas and mineral lease, division orders, transfer
orders, letters-in-lieu, environmental, fee, easement and right-of-way, surface
lease, operating agreement, farmout, unitization and pooling and land abstract
files and records as well as original well record files on all wells including
but not limited to production histories and well logs, (i.e., all wells
situated on the SHELL Property geologic data, maps and accounting files) but
save, less and except therefrom all Proprietary Data which shall include,
without limitation, (i) all privileged or confidential data, (ii) any
interpretive geological and geophysical information which may reveal the
methods used by SHELL in interpreting geological and geophysical information,
economic analysis, and any information or other similar proprietary data which
might reveal SHELL's economic guidelines or other methods or systems by which
SHELL conducts its economic analysis, and (iii) any similar proprietary data.

                          SHELL retains the right of complete access to the
above files and records, which right of access may be exercised by SHELL at
reasonable times, upon giving PLAINS reasonable notice and which shall include,
at SHELL's sole cost and expense, the right to copy or duplicate any and all
contents therein.  Should SHELL be required by a governmental rule or order to
produce the original of any document described in this subsection, PLAINS will,
to the best of its ability, make such document available to enable SHELL to
comply with said rule or order upon receiving proper assurance that such
document will be promptly returned to PLAINS.

                                                                              31
<PAGE>   36
                          After Closing, SHELL shall grant PLAINS the right of
access to the following SHELL files, records, documents, and data relating to
the SHELL Property: division order, transfer order, letters-in-lieu,
regulatory, accounting, marketing, environmental, pipeline, maintenance,
transportation, processing, production, and engineering files and records not
conveyed and transferred to PLAINS; however, this right of access shall not
extend to or cover Proprietary Data as defined herein.  PLAINS' right of access
may be exercised at reasonable times, upon giving SHELL reasonable notice and
shall include, at PLAINS' sole cost and expense, the right to copy any and all
contents therein not otherwise excluded subject to the following: (1) only
division of interest sheets, division orders, transfer orders, letters-in-lieu,
title opinions, and title curative material may be copied from division order
files, and (2) only gas contracts and amendments or agreements relating thereto
and pertinent outside correspondence may be copied from gas files.  Should
PLAINS be required by a governmental rule or order to produce the original of
any document to which the right of access has been granted by this subsection,
SHELL will, to the best of its ability, make such document available to enable
PLAINS to comply with said rule or order upon receiving proper assurance that
such document will be promptly returned to SHELL.

                          SHELL acknowledges that PLAINS has no files or
records on the PLAINS Property.

                 (p)      Rule 430 Nox Reduction Liability. SHELL agrees to be
responsible for all costs, expenses, and equipment or facility modifications
necessary to bring the equipment and facilities into compliance with Rule 430
(reduction of Nox to 30 ppm) as in effect on the Closing Date for all equipment
associated with the SHELL Property prior to Closing.  SHELL agrees to be liable
and to hold PLAINS harmless for any penalties, fines or costs associated with
any





                                                                              32
<PAGE>   37

noncompliance of Rule 430 by May 1, 1997.  PLAINS agrees to provide access to
such equipment as is necessary to perform any modification or repairs required
to achieve compliance with such rule.

                 (q)      Pismo Creek Pipeline Crossing Expenses.  SHELL agrees
that it is solely responsible for the costs and expenses attributable to the
construction of the pipeline crossing over Pismo Creek and the associated
bridge work on the SHELL Property and will indemnify and hold PLAINS harmless
for any such cost or expense.

                 (r)      Operational Continuity.  SHELL agrees to work with
PLAINS to ensure that the operations of the SHELL Property are efficiently
transferred to PLAINS so that PLAINS has adequate manpower and the expertise
necessary to operate the SHELL Property at the time of transfer.  SHELL agrees
with PLAINS to enter into the Services Contract set forth on Schedule 25(r).

         26.     CALL ON PRODUCTION.  Until December 1, 1997, SHELL shall
retain a call on all crude oil production from the SHELL Property. Pricing for
such production shall be as set forth on Schedule 26.





                                                                              33
<PAGE>   38



                 EXECUTED by the Parties hereto as indicated below by the
signatures of their respective representatives; however, for identification
purposes, this AGREEMENT shall be deemed dated as of the date the last Party
hereto signs this AGREEMENT.

                                        SHELL Land & Energy Company
                                       
                                       
                                        By:    /s/ D. S. BRIDGES
                                            ------------------------------------
                                       
                                        Title:     Attorney-in-Fact
                                               ---------------------------------
                                       
                                        Date:      November 12, 1997
                                               ---------------------------------
                                           
                                       
                                        SHELL Western E&P Inc.
                                       
                                       
                                        By:    /s/ CHRIS BOYD
                                            ------------------------------------
                                       
                                        Title:     Attorney-in-Fact
                                               ---------------------------------
                                       
                                        Date:      November 12, 1997
                                               ---------------------------------
                                           
                                       
                                        Plains Resources Inc.

                                                                              
                                        By:    /s/ PHIL KRAMER
                                            ------------------------------------
                                       
                                        Title:     Senior Vice President
                                               ---------------------------------
                                       
                                        Date:      November 12, 1997
                                               ---------------------------------
                                       



                                                                              34

<PAGE>   1
                                                                       EXHIBIT 6


                                  EXHIBIT A-3
                                PREFERRED STOCK
                                      and
                        WARRANT TO PURCHASE COMMON STOCK

         The Preferred Stock to be issued and delivered to Shell Land & Energy
Company ("Shell Shareholder") by Plains Resources Inc. ("Plains") pursuant to
the Exchange Agreement to which this Exhibit A-3 is attached (the "Agreement")
shall be 46,600 shares of Series D Cumulative Convertible Preferred Stock (the
"Preferred Stock") of Plains, the terms and provisions of which are set forth
in the Certificate of Designation, Preferences and Rights of a Series of
Preferred Stock attached hereto as Attachment 1 (the "Certificate of
Designation").

         In addition, the Agreement provides for the issuance to Shell
Shareholder of a warrant to purchase 150,000 shares (the "Warrant Shares") of
Plains common stock, $.10 per share par value ("Common Stock"), upon the terms
and conditions of which are set forth in that certain form of "Warrant for the
Purchase of Shares of Common Stock" attached hereto as Attachment 2 (the
"Warrant").

         1.      REGISTRATION OBLIGATIONS.

         a.      Shelf Registration.  Plains shall, as promptly as reasonably
practicable, but in any event within ninety (90) days of the date of Closing
(as defined in the Agreement), prepare and file with the Securities and
Exchange Commission ("SEC'):

         (i)     a shelf registration statement (the "Preferred Stock &
         Conversion Shares Registration Statement") pursuant to Rule 415 of the
         Securities Act of 1933, as amended (the "Securities Act") with respect
         to the shares of preferred Stock and the shares of Common Stock of
         plains into which the Preferred Stock and any dividend arrearage
         thereon is convertible or exchangeable (the "Conversion, Shares") (the
         Preferred Stock and Conversion Shares collectively referred to as the
         "Shares") and use its best efforts to cause the Preferred Stock &
         Conversion Shares Registration Statement to become and remain
         effective until such time as all of the outstanding Shares can be
         resold pursuant to SEC Rule 144(k) (or any successor provision) under
         the Securities Act; and

         (ii)     a shelf registration statement (the "Warrant Shares
         Registration Statement") pursuant to Rule 415 of the Securities Act
         with respect to the Warrant Shares and use its best efforts to cause
         the Warrant Shares Registration Statement to become and remain
         effective until the earlier of(x) the expiration of the Warrant or (y)
         such time as all of the Warrant Shares can be resold pursuant to SEC
         Rule 144(k) (or any successor provision) under the Securities Act.
<PAGE>   2
The Preferred Stock & Conversion Shares Registration Statement and the Warrant
Shares Registration Statement are collectively referred to herein as the
"Registration Statements".

         Shell Shareholder shall, within ten (10) days of the Closing, notify
Plains of its proposed method of distribution of the Shares and the Warrant
Shares, and the plan(s) of the distribution in each of the Registration
Statements shall be to sell the Shares only through the methods of distribution
so specified by Shell Shareholder. In the absence of a contrary written
indication by Shell Shareholder, the Plan of Distribution in each of the
Registration Statements shall be deemed to be as follows:

         "The Shares or Warrant Shares may be sold from time to time by or for
the account of holder thereof in the over-the-counter market, or otherwise at
prices and on terms then prevailing or at prices related to then current market
price, in negotiated transactions or, with respect to the Conversion Shares or
Warrant Shares, on the American Stock Exchange ("AMEX"). The Shares or the
Warrant Shares may be sold by any one or more of the following methods:

         (i)     a block trade (which may involve crosses) in which the broker
         or dealer so engaged will attempt to sell the securities as agent but
         may position and resell a portion of the block as principal to
         facilitate the transaction;

         (ii)    purchase by broker or dealer as principal and resale by such
         broker or dealer for its account pursuant to the Prospectus;

         (iii)   exchange distributions and/or secondary distributions of the
         Conversion Shares or the Warrant Shares in accordance with the rules
         of the AMEX;

         (iv)    ordinary brokerage transactions and transactions in which the
         broker solicits purchasers; and

         (v)     privately negotiated transactions.

         Shell Shareholder may effect any such transaction by selling Shares or
Warrant Shares through broker-dealers, and such broker-dealers may receive
compensation in the form of commissions from Shell Shareholder (which
commissions will not exceed the customary in the types of transactions
involved). Shell Shareholder and any broker-dealers that participate in the
distribution of the Shares or the Warrant Shares may be deemed to be
"underwriters" within the meaning of the Securities Act in connection with such
sales, and any profit on the sale of Shares by it and any commissions received
by any such broker-dealers may be deemed to be underwriting discounts and
commissions."





                                  
<PAGE>   3
         In addition to the foregoing, Shell Shareholder may sell the Shares
under the Registration Statements through one underwritten offering under a
plan of distribution which is acceptable to Plains in its reasonable
discretion.

         b.      Amendments.  From time to time, Plains shall prepare and file
with the SEC such amendments and supplements to each of the Registration
Statements and each prospectus used in connection with the Registration
Statements (a "Prospectus") as may be necessary to comply with the provisions
of the Securities Act with respect to the disposition of all securities covered
by the Registration Statements.

         c.      Prospectus.  Plains shall furnish to Shell Shareholder such
numbers of copies of each Prospectus, including a preliminary prospectus, in
conformity with the requirements of the Securities Act, and such other
documents as Shell Shareholder may reasonably request in order to facilitate
the disposition of the Shares or the Warrant Shares.

         d.      Blue Sky.  Plains shall use its best efforts to register and
qualify the securities covered by each of the Registration Statements under
such other securities or Blue Sky laws of such jurisdictions as shall be
reasonably appropriate for the distribution of the securities covered by each
of the Registration Statements, provided that Plains shall not be required in
connection therewith or as a condition thereto to qualify to do business or to
file a general consent to service of process in any such states or
jurisdictions, and further provided that (notwithstanding anything herein to
the contrary with respect to the beating of expenses) if any jurisdiction in
which the securities shall be qualified shall require that expenses incurred in
connection with the qualification of the securities in that jurisdiction be
borne by selling shareholders, then such expenses shall be payable by Shell
Shareholder, to the extent required by such jurisdiction.

         e.      Expenses.  All expenses incurred in connection with each
registration pursuant hereto (excluding underwriters' and brokers' discounts
and commissions), including without limitation all registration and
qualification fees, printers' and accounting fees, and fees and disbursements
of counsel for Plains, shall be borne by Plains. Shell Shareholder shall be
responsible for its own counsel fees.

         f.      Other Documents.  Plains shall file with the SEC in a timely
manner all reports and other documents required of Plains under the Securities
Act and the Securities Exchange Act of 1934, as amended.

         g.      Current Prospectus.  Shell Shareholder acknowledges that from
time to time, events may occur which will require a Prospectus to be
supplemented or amended in order to comply with federal securities laws. Upon
the occurrence of such event, Plains shall notify Shell Shareholder of the need
to supplement or amend a Prospectus. After receipt of such notice, Shell
Shareholder shall not sell any Shares or Warrant Shares until receipt of such
Prospectus supplement or amendment has been delivered by Plains. Plains shall
use reasonable best efforts to deliver such Prospectus supplement or amendment;
provided, however, Plains shall not be required to deliver such supplement or
amendment until the earlier of.

         (i)     the time disclosure of such event is required by federal
                 securities laws; or,





                                  
<PAGE>   4
         (ii)    such time as the management of Plains determines that in its
                 good faith judgment such disclosure is in the best interests
                 of Plains.

         h.      Indemnification: Contribution.

         (i)     Indemnification by Plains.  Plains agrees to indemnify and
                 hold harmless Shell Shareholder, its officers, directors,
                 partners and agents and each person, if any, who controls
                 Shell Shareholder within the meaning of Section 15 of the
                 Securities Act or Section 20 of the Exchange Act, from and
                 against any and all losses, claims, damages (whether in
                 contract, tort or otherwise), liabilities and expenses
                 (including reasonable costs of investigation) whatsoever (as
                 incurred or suffered) arising out of or based upon any untrue
                 statement or alleged untrue statement of a material fact
                 contained in any registration statement or prospectus relating
                 to the Shares or Warrant Shares or in any amendment or
                 supplement thereto or in any preliminary prospectus, or
                 arising out of or based upon any omission or alleged omission
                 to state therein a material fact required to be stated therein
                 or necessary to make the statements therein not misleading,
                 except insofar as such losses, claims, damages, liabilities or
                 expenses arise out of; or are based upon, any such untrue
                 statement or omission or allegation thereof based upon
                 information furnished in writing to Plains by Shell
                 Shareholder or on Shell Shareholder's behalf expressly for use
                 therein. Plains also agrees to indemnify any underwriters of
                 the Shares, their officers, partners and directors and each
                 person who controls such underwriters on substantially the
                 same basis as that of the indemnification of Shell Shareholder
                 provided in this paragraph 1 .h (i) or such other
                 indemnification customarily obtained by underwriters at the
                 time of offering.

         (ii)    Conduct of Indemnification Proceedings   If any action or
                 proceeding (including any governmental investigation) shall be
                 brought or asserted against Shell Shareholder (or its
                 officers, directors, partners or agents) or any person
                 controlling Shell Shareholder in respect of which indemnity
                 may be sought from Plains, Plains shall assume the defense
                 thereof, including the employment of counsel reasonably
                 satisfactory to Shell Shareholder, and shall assume the
                 payment of all expenses. Shell Shareholder or any controlling
                 person of Shell Shareholder shall have the right to employ
                 separate counsel in any such action and to participate in the
                 defense thereof, but the fees and expenses of such counsel
                 shall be at the expense of Shell Shareholder or such
                 controlling person unless (i) Plains has agreed to pay such
                 fees and expenses or (ii) the named parties to any such action
                 or proceeding (including any impleaded parties) include both
                 Shell Shareholder or such controlling person and Plains, and
                 Shell Shareholder or such controlling person shall have been
                 advised by counsel that there may be one or more legal
                 defenses available to Shell Shareholder or such controlling
                 person which conflict with those available to Plains (in which
                 case, if Shell Shareholder or such controlling person notifies
                 Plains in writing that it elects to employ separate counsel at
                 the expense of plains, Plains shall not have the right to
                 assume the defense of such action or proceeding on behalf of
                 Shell Shareholder or such controlling person; it being
                 understood, however, that Plains shall not, in connection with
                 any one such action or proceeding or separate but
                 substantially similar or related actions or proceedings in the
                 same jurisdiction arising out of the same general allegations
                 or circumstances, be liable for the





                                  
<PAGE>   5
                 fees and expenses of more than one separate firm of attorneys
                 (together with appropriate local counsel) at any time for
                 Shell Shareholder and such controlling persons, which firm
                 shall be designated in writing by Shell Shareholder). Plains
                 shall not be liable for any settlement of any such action or
                 proceeding effected without Plains's written consent, but if
                 settled with its written consent, or if there be a final
                 judgment for the plaintiff in any such action or proceeding,
                 Plains agrees to indemnify and hold harmless Shell Shareholder
                 and such controlling person from and against any loss or
                 liability (to the extent stated above) by reason of such
                 settlement or judgment.

         (iii)   Indemnification by Shell Shareholder.   Shell Shareholder
                 agrees to indemnify and hold harmless Plains, its directors
                 and officers and each person, if any, who controls Plains
                 within the meaning of either Section 15 of the Securities Act
                 or Section 20 of the Exchange Act, as amended, to the same
                 extent as the foregoing indemnity from Plains to Shell
                 Shareholder, but only with respect to information included in
                 the prospectus in response to Item 508 (Plan of Distribution)
                 of Regulation S-K under the Securities Act or any information
                 furnished in writing by Shell Shareholder or on Shell
                 Shareholder's behalf expressly for use in any registration
                 statement or prospectus relating to the Shares or the Warrant
                 Shares, or any amendment or supplement thereto, or any
                 preliminary prospectus. In case any action or proceeding shall
                 be brought against Plains or its directors or officers, or any
                 such controlling person, in respect of which indemnity may be
                 sought against Shell Shareholder, Shell Shareholder shall have
                 the rights and duties given to Plains, and Plains or its
                 directors or officers or such controlling person shall have
                 the rights and duties given to Shell Shareholder, by the
                 preceding paragraph. Shell Shareholder also agrees to
                 indemnify and hold harmless underwriters of the Shares, their
                 officers and directors and each person who controls such
                 underwriters on substantially the same basis as that of the
                 indemnification of Plains provided in this paragraph 1 .h(iii).

         (iv)    Contribution   If the indemnification provided for in this
                 paragraph 1 .h is unavailable to Plains, Shell Shareholder or
                 the underwriters in respect of any losses, claims, damages,
                 liabilities or judgments referred to herein, then each such
                 indemnifying party, in lieu of indemnifying such indemnified
                 party, shall contribute to the amount paid or payable by such
                 indemnified party as a result of such losses, claims, damages,
                 liabilities and judgments (i) as between Plains and Shell
                 Shareholder on the one hand and the underwriters on the other,
                 in such proportion as is appropriate to reflect the relative
                 benefits received by Plains and Shell Shareholder on the one
                 hand and the underwriters on the other from the offering of
                 the Shares, or if such allocation is not permitted by
                 applicable law, in such proportion as is appropriate to
                 reflect not only such relative benefits but also the relative
                 fault of plains and Shell Shareholder on the one hand and of
                 the underwriters on the other in connection with the
                 statements or omissions which resulted in such losses, claims,
                 damages, liabilities or judgments, as well as any other
                 relevant equitable considerations and (ii) as between Plains,
                 on the one hand, and Shell Shareholder on the other, in such
                 proportion as is appropriate to reflect the relative fault of
                 Plains and of Shell Shareholder in connection with such
                 statements or omissions, as well as any other relevant
                 equitable considerations. The relative benefits received by
                 Plains and Shell Shareholder on the one hand and the
                 underwriters on the other shall be deemed to be in the same
                 proportion as the total proceeds from the offering (net of
                 underwriting discounts and commissions but before deducting
                 expenses) received by Plains and Shell Shareholder bear to the
                 total underwriting discounts and commissions received by the
                 underwriters, in each case as set forth in the table on the
                 cover page of the prospectus. The relative fault of Plains and
                 Shell Shareholder on the one hand and of the underwriters on





<PAGE>   6
                 the other shall be determined by reference to, among other
                 things, whether the untrue or alleged untrue statement of a
                 material fact or the omission or alleged omission to state a
                 material fact relates to information supplied by Plains and
                 Shell Shareholder or by the underwriters. The relative fault
                 of plains on the one hand and of Shell Shareholder on the
                 other shall be determined by reference to, among other things,
                 whether the untrue or alleged untrue statement of a material
                 fact or the omission or alleged omission to state a material
                 fact relates to information supplied by such party, and the
                 parties' relative intent, knowledge, access to information and
                 opportunity to correct or prevent such statement or omission.

         Plains and Shell Shareholder agree that it would not be just and
equitable if contribution pursuant to this paragraph 1 .h were determined by
pro rata allocation (even if the underwriters were treated as one entity for
such purpose) or by any other method of allocation which does not take account
of the equitable considerations referred to in the immediately preceding
paragraph. The amount paid or payable by an indemnified party as a result of
the losses, claims, damages, liabilities or judgments referred to in the
immediately preceding paragraph shall be deemed to include, subject to the
limitations set forth above, any legal or other expenses reasonably incurred by
such indemnified party in connection with investigating or defending any such
action or claim. Notwithstanding the provisions of this paragraph 1 .h, no
underwriter shall be required to contribute any amount in excess of the amount
by which the total price at which the Shares underwritten by it and distributed
to the public were offered to the public exceeds the amount of any damages
which such underwriter has otherwise been required to pay by reason of such
untrue or alleged untrue statement or omission or alleged omission, and Shell
Shareholder shall not be required to contribute any amount in excess of the
amount by which the total price at which the Shares of Shell Shareholder were
offered to the public exceeds the amount of any damages which Shell Shareholder
has otherwise been required to pay by reason of such untrue or alleged untrue
statement or omission or alleged omission. No person guilty of fraudulent
misrepresentation (within the meaning of Section 1 l(f) of the Securities Act)
shall be entitled to contribution from any person who was not guilty of such
fraudulent misrepresentation.

         i.      Binding Effect: Assignment.  The terms and provisions of this
Section 1.  Obligations shall be binding upon and inure to the benefit of and
be enforceable by Plains and Shell Shareholder and their respective successors
and assigns.

         2.      NOTICE.  Plains will provide written notice to Shell
Shareholder prior to the issuance of Parity Stock (as defined in the
Certificate of Designation).

         3.      LISTING OF THE CONVERSION SHARES AND WARRANT SHARES. Plains
shall cause the Conversion Shares and the Warrant Shares to be listed on the
American Stock Exchange, when and as issued.




<PAGE>   7
         4.      ASSISTANCE IN OFFERING. If Shell Shareholder desires to sell
all of the Preferred Stock in a public offering or a private offering to a
third party who is not an affiliate of Shell Shareholder, Plains shall
cooperate with Shell Shareholder and its investment banking firm to facilitate
such offering, including participating in road show presentations. If, in the
written opinion of Shell Shareholder's investment banker (which shall be a firm
of recognized standing), the gross proceeds from the sale of all of the
Preferred Stock in such offering will be less than $23.3 million, Plains shall
amend the Certificate of Designation to increase the annual dividend rate on
the Preferred Stock to a percentage reasonably estimated in good faith by such
investment banker to be required to enable Shell Shareholder to receive $23.3
million of gross proceeds in such offering; provided however, in no event shall
the annual dividend rate exceed 7.5 percent.

         5.      RIGHT OF FIRST REFUSAL.

         a.      Preferred Stock.   If Shell Shareholder receives an offer to
purchase all or any of the shares of Preferred Stock (other than in a public
offering) from a nonaffiliated which it intends to accept (a "Preferred Stock
Offer"), Shell Shareholder shall give written notice to Plains, with full
information concerning the Preferred Stock Offer. Plains shall then have the
optional prior right, which may be exercised by written notice to Shell
Shareholder within seven business days after the notice is received, to
purchase the shares of Preferred Shares for which the Preferred Stock Offer is
made by payment of 105% of the purchase price proposed in the Preferred Stock
Offer. If Plains exercises this right to purchase, the purchase price shall be
paid to Shell Shareholder within three business days after its written notice
of exercise is given to Shell Shareholder. Upon receipt of the purchase price
Shell Shareholder shall deliver to Plains the certificate[s] for the Preferred
Stock being sold, duly endorsed for transfer.

         b.      Warrant.  If Shell Shareholder receives an offer to purchase
all or part of Warrant (other than in a public offering) from a non-affiliate
which it intends to accept (a "Warrant Offer"), Shell Shareholder shall give
written notice to Plains, with full information concerning the Warrant Offer.
Plains shall then have the optional prior right, which may be exercised by
written notice to Shell Shareholder within five business days after the notice
is received, to purchase the Warrant or part thereof for which the Warrant
Offer is made by payment of 105% of the purchase price proposed in the Warrant
Offer. If plains exercises this right to purchase, the purchase price shall be
paid to Shell Shareholder within three business days after its written notice
of exercise is given to Shell Shareholder. Upon receipt of the purchase price
Shell Shareholder shall deliver to Plains the certificate[s] for the Warrant or
part thereof being sold, duly endorsed for transfer.

         6.      REPRESENTATIONS AND WARRANTIES OF PLAINS.  Plains represents
and warrants to Shell Shareholder as follows:

         a.      The issuance, sale and delivery of the Preferred Stock in
accordance with the Agreement, including this Exhibit A-3, have been duly
authorized by all necessary corporate action on the part of Plains and its
stockholders, and the Preferred Stock when so issued, sold and delivered
against payment therefor in accordance with the Agreement and this Exhibit A-3
will be duly and validly issued, fully paid and nonassessable.

         b.      The issuance and delivery of the Conversion Shares have been
duly authorized and reserved for issuance by all necessary corporate action on
the part of Plains and its stockholders, and the Conversion





<PAGE>   8
Shares, when issued in accordance with the Certificate of Designation, will be
duly and validly issued, fully paid and nonassessable.

         c.      The issuance and delivery of the Warrant and the Warrant
Shares have been duly authorized and the Warrant Shares have been duly reserved
for issuance by all necessary corporate action on the part of plains and its
stockholders, and the Warrant Shares, when issued in accordance with the
Warrant, will be duly and validly issued, fully paid and nonassessable.







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