USG CORP
8-K, 1998-03-27
CONCRETE, GYPSUM & PLASTER PRODUCTS
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549



                                    FORM 8-K

                                 CURRENT REPORT



                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934


                         Date of Report: March 27, 1998




                                 USG CORPORATION

               (Exact name of registrant as specified in charter)


 Delaware                              1-8864                  36-3329400
 -------------------------------------------------------------------------------
 (State or other jurisdiction of   (Commission File         (I.R.S. Employer
  incorporation or organization)    Number)                 Identification No.)


          125 South Franklin Street, Chicago, Illinois 60606-4678
          -------------------------------------------------------
          (Address of principal executive offices)     (zip code)

 Registrant's telephone number, including area code   (312) 606-4000
                                                      --------------

<PAGE>

Item 5.  Other Events

On March 27, 1998,  the Board of Directors of USG  Corporation  (the  "Company")
declared a dividend of one preferred  share  purchase right (a "Right") for each
outstanding  share of common  stock,  par value  $0.10  per share  (the  "Common
Shares"),  of the Company,  and voted to redeem the outstanding  preferred share
purchase  rights ("Old Rights") at the redemption  price of $0.01 per Old Right.
The Rights dividend and Old Rights redemption both are payable on May 1, 1998 to
the  stockholders  of record on April 15, 1998 (the "Record  Date").  Each Right
entitles the registered holder to purchase from the Company one one-hundredth of
a share of  Junior  Participating  Preferred  Stock,  Series D, par value $1 per
share  (the  "Preferred  Shares"),  of the  Company  at a price  of $200 per one
one-hundredth  of  a  Preferred  Share  (the  "Purchase   Price"),   subject  to
adjustment.  The  description  and terms of the Rights are set forth in a Rights
Agreement dated March 27, 1998 (the "Rights Agreement"), between the Company and
Harris Trust and Savings Bank, as Rights Agent (the "Rights Agent").

Until the  earlier to occur of 10 days  following a public  announcement  that a
person or group of affiliated or associated persons (an "Acquiring Person") have
acquired beneficial ownership of 15% or more of the outstanding Common Shares or
(ii) 10 business  days (or such later date as may be determined by action of the
Board of Directors  prior to such time as any person or group of  affiliated  or
associated  persons becomes an Acquiring  Person) following the commencement of,
or  announcement  of an intention to make, a tender offer or exchange  offer the
consummation  of which would result in the  beneficial  ownership by a person or
group of 15% or more of the outstanding Common Shares (the earlier of such dates
being  called the  "Distribution  Date"),  the Rights  will be  evidenced,  with
respect to any of the Common  Share  certificates  outstanding  as of the Record
Date, by such Common Share  certificates.  The Rights  Agreement  provides that,
until the Distribution  Date (or earlier  redemption,  exchange or expiration of
the  Rights),  the  Rights  will be  transferred  with and only with the  Common
Shares.  Until  the  Distribution  Date  (or  earlier  redemption,  exchange  or
expiration of the Rights), new Common Share certificates issued after the Record
Date upon  transfer  or new  issuance of Common  Shares will  contain a notation
incorporating the Rights Agreement by reference. Until the Distribution Date (or
earlier  redemption,  exchange or expiration  of the Rights),  the surrender for
transfer of any  certificates  for Common  Shares  outstanding  as of the Record
Date,  even  without such  notation,  will also  constitute  the transfer of the
Rights  associated with the Common Shares  represented by such  certificate.  As
soon as  practicable  following the  Distribution  Date,  separate  certificates
evidencing the Rights ("Right Certificates") will be mailed to holders of record
of the Common  Shares as of the close of business on the  Distribution  Date and
such separate Right Certificates alone will evidence the Rights.

The Rights are not exercisable until the Distribution Date. The Rights
will expire on March 27, 2008 (the "Final  Expiration  Date"),  unless the Final
Expiration  Date is  extended  or unless  the  Rights are  earlier  redeemed  or
exchanged by the Company, in each case as described below.

The  Purchase  Price  payable,  and the  number  of  Preferred  Shares  or other
securities  or  property  issuable,  upon  exercise of the Rights are subject to
adjustment  from  time to time  to  prevent  dilution  in the  event  of a stock
dividend on, or a subdivision, combination or reclassification of, the Preferred
Shares, (ii) upon the grant to holders of the Preferred Shares of certain rights
or  warrants  to  subscribe  for or  purchase  Preferred  Shares at a price,  or
securities  convertible into Preferred Shares with a conversion price, less than
the  then-current  market  price of the  Preferred  Shares,  or  (iii)  upon the
distribution to holders of the Preferred  Shares of evidences of indebtedness or
assets  (excluding  regular  periodic  cash  dividends  paid out of  earnings or
retained  earnings or dividends  payable in Preferred Shares) or of subscription
rights or warrants (other than those referred to above).

The  number of  outstanding  Rights and the  number of one  one-hundredths  of a
Preferred  Share  issuable  upon  exercise  of each  Right are also  subject  to
adjustment  in the  event  of a stock  split  of the  Common  Shares  or a stock
dividend  on the  Common  Shares  payable  in  Common  Shares  or  subdivisions,
consolidations or combinations of the Common Shares occurring, in any such case,
prior to the Distribution Date.

Preferred Shares purchasable upon exercise of the Rights will not be redeemable.
Each  Preferred  Share  will be  entitled  to a minimum  preferential  quarterly
dividend payment of $25 per share but will be entitled to an aggregate  dividend
of  100  times  the  dividend  declared  per  Common  Share.  In  the  event  of
liquidation,  the holders of the Preferred  Shares will be entitled to a minimum
preferential  liquidation  payment of $100 per share but will be  entitled to an
aggregate payment of 100 times the payment made per Common Share. Each Preferred
Share will have 100 votes,  voting together with the Common Shares.  Finally, in
the event of any merger,  consolidation  or other  transaction  in which  Common
Shares are exchanged, each Preferred Share will be entitled to receive 100 times
the amount  received per Common  Share.  These rights are protected by customary
anti-dilution provisions.

Because of the nature of the Preferred Shares' dividend,  liquidation and voting
rights,  the  value  of the one  one-hundredth  interest  in a  Preferred  Share
purchasable  upon  exercise of each Right  should  approximate  the value of one
Common Share.

In the  event  that  the  Company  is  acquired  in a merger  or other  business
combination  transaction  or 50% or more of its  consolidated  assets or earning
power are sold after a person or group has become an  Acquiring  Person,  proper
provision will be made so that each holder of a Right will  thereafter  have the
right to receive,  upon the exercise  thereof at the then current exercise price
of the Right,  that number of shares of common  stock of the  acquiring  company
which at the time of such  transaction will have a market value of two times the
exercise price of the Right. In the event that any person or group of affiliated
or associated  persons becomes an Acquiring  Person,  proper  provision shall be
made so that each holder of a Right, other than Rights beneficially owned by the
Acquiring Person (which will thereafter be void), will thereafter have the right
to receive upon  exercise  that number of Common Shares having a market value of
two times the exercise price of the Right.

At any time after any person or group  becomes an Acquiring  Person and prior to
the acquisition by such person or group of 50% or more of the outstanding Common
Shares,  the Board of Directors  of the Company may  exchange the Rights  (other
than Rights owned by such person or group which will have become void), in whole
or in part, at an exchange ratio of one Common Share, or one  one-hundredth of a
Preferred  Share (or of a share of a class or series of the Company's  preferred
stock having equivalent rights, preferences and privileges),  per Right (subject
to adjustment).

With certain  exceptions,  no adjustment in the Purchase  Price will be required
until  cumulative  adjustments  require  an  adjustment  of at  least 1% in such
Purchase  Price.  No  fractional  Preferred  Shares  will be issued  (other than
fractions  which are  integral  multiples  of one  one-hundredth  of a Preferred
Share,  which may, at the  election of the Company,  be evidenced by  depositary
receipts) and in lieu  thereof,  an adjustment in cash will be made based on the
market price of the  Preferred  Shares on the last trading day prior to the date
of exercise.

At any time  prior to the  acquisition  by a person  or group of  affiliated  or
associated  persons of  beneficial  ownership of 15% or more of the  outstanding
Common  Shares,  the Board of  Directors of the Company may redeem the Rights in
whole, but not in part, at a price of $.01 per Right (the  "Redemption  Price").
The  redemption of the Rights may be made  effective at such time, on such basis
and with such  conditions as the Board of Directors in its sole  discretion  may
establish.  Immediately upon any redemption of the Rights, the right to exercise
the Rights will terminate and the only right of the holders of Rights will be to
receive the Redemption Price.

The terms of the Rights may be amended by the Board of  Directors of the Company
without  the consent of the holders of the Rights,  including  an  amendment  to
lower certain thresholds described above to not less than the greater of the sum
of .001% and the largest  percentage of the outstanding Common Shares then known
to the Company to be beneficially  owned by any person or group of affiliated or
associated  persons  and (ii) 10%,  except  that from and after such time as any
person or group of affiliated or associated  persons becomes an Acquiring Person
no such  amendment  may  adversely  affect the  interests  of the holders of the
Rights.

Until a Right is exercised,  the holder thereof, as such, will have no rights as
a stockholder of the Company,  including,  without limitation, the right to vote
or to receive dividends.

The Rights have certain anti-takeover effects. The Rights will cause substantial
dilution to a person or group that  attempts to acquire the Company on terms not
approved  by the  Company's  Board of  Directors,  except  pursuant  to an offer
conditioned on a substantial number of Rights being acquired.  The Rights should
not  interfere  with any merger or other  business  combination  approved by the
Board of  Directors  since the  Rights  may be  redeemed  by the  company at the
Redemption  Price  prior  to the  time  that a  person  or  group  has  acquired
beneficial ownership of 15% or more of the Common Shares.

The Rights Agreement,  dated March 27, 1998 between the Company and Harris Trust
and Savings Bank, as Rights  Agent,  specifying  the terms of the Rights and the
form of press  release  announcing  the  declaration  of the rights are attached
hereto as exhibits  and are  incorporated  herein by  reference.  The  foregoing
description  of the Rights is  qualified  in its  entirety by  reference  to the
Rights Agreement in the exhibit attached hereto.


Item 6.  Exhibits

Exhibit
- -------

4       Rights  Agreement,  dated March 27, 1998,  between USG  Corporation and
        Harris Trust and Savings Bank, as Rights Agent, with exhibits.

99      Press release dated March 27, 1998.



<PAGE>

                                    SIGNATURE


Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereto duly authorized.


                                        USG Corporation



Dated:   March 27, 1998.                By:/s/ Dean H. Goossen
                                        ----------------------
                                        Dean H. Goossen,
                                        Corporate Secretary






<TABLE>
EXHIBIT LIST
<CAPTION>
<S>      <C>

Exhibit 
- --------

4        Rights  Agreement,  dated March 27, 1998,  between USG  Corporation and
         Harris Trust and Savings Bank, as Rights Agent, with exhibits.

99       Press release dated March 27, 1998.
</TABLE>
<PAGE>








- --------------------------------------------------------------------------------
                                   EXHIBIT 4


                                 USG CORPORATION

                                       and

                         HARRIS TRUST AND SAVINGS BANK,

                                  Rights Agent

                                Rights Agreement

                           Dated as of March 27, 1998


- --------------------------------------------------------------------------------
<PAGE>
<TABLE>
                                                      TABLE OF CONTENTS
<CAPTION>
<S>              <C>                                                                                             <C>
Section 1.        Certain Definitions............................................................................1

Section 2.        Appointment of Rights Agent ...................................................................6

Section 3.        Issue of Right Certificates ...................................................................6

Section 4.        Form of Right Certificates ....................................................................9

Section 5.        Countersignature and Registration ............................................................10

Section 6.        Transfer, Split Up, Combination and ..........................................................11
                           Exchange of Right Certificates;
                           Mutilated, Destroyed, Lost or
                           Stolen Right Certificates

Section 7.        Exercise of Rights; Purchase Price; ..........................................................12
                           Expiration Date of Rights

Section 8.        Cancellation and Destruction of ..............................................................14
                           Right Certificates

Section 9.        Reservation and Availability of Common Shares ................................................15

Section 10.       Preferred Shares Record Date .................................................................16

Section 11.       Adjustment of Purchase Price, Number of ......................................................16
                           Shares or Number of Rights

Section 12.       Certificate of Adjusted Purchase Price .......................................................29
                           or Number of Shares

Section 13.       Consolidation, Merger or Sale or Transfer ....................................................30
                           of Assets or Earning Power

Section 14.       Fractional Rights and Fractional Shares ......................................................31

Section 15.       Rights of Action ............................................................................ 34

Section 16.       Agreement of Right Holders ...................................................................34

Section 17.       Right Certificate Holder Not Deemed a Stockholder.............................................35

Section 18.       Concerning the Rights Agent  .................................................................36

Section 19.       Merger or Consolidation or Change of .........................................................37
                           Name of Rights Agent

Section 20.       Duties of Rights Agent .......................................................................38

Section 21.       Change of Rights Agent .......................................................................42

Section 22.       Issuance of New Right Certificates ...........................................................43

Section 23.       Redemption ...................................................................................44

Section 24.       Exchange .....................................................................................45

Section 25.       Notice of Certain Events .....................................................................47

Section 26.       Notices ......................................................................................49

Section 27.       Supplements and Amendments ...................................................................50

Section 28.       Successors ...................................................................................51

Section 29.       Benefits of this Agreement ...................................................................51

Section 30.       Severability .................................................................................51

Section 31.       Governing Law ................................................................................51

Section 32.       Counterparts .................................................................................52

Section 33.       Descriptive Headings .........................................................................52

                  Signatures ...................................................................................52

Exhibit A -       Form of Certificate of Designations

Exhibit B -       Form of Right Certificate

Exhibit C -       Summary of Rights to Purchase Preferred
                           Shares
</TABLE>
<PAGE>

Agreement,  dated as of March 27,  1998,  between  USG  Corporation,  a Delaware
corporation  (the  "Company"),  and Harris Trust and Savings  Bank,  an Illinois
banking corporation (the "Rights Agent").

The Board of Directors of the Company has  authorized and declared a dividend of
one  preferred  share  purchase  right (a  "Right")  for each  Common  Share (as
hereinafter  defined) of the Company  outstanding on April 15, 1998 (the "Record
Date"),  each Right  representing  the right to purchase one  one-hundredth of a
Preferred  Share (as  hereinafter  defined),  upon the terms and  subject to the
conditions  herein  set forth,  and has  further  authorized  and  directed  the
issuance  of one Right with  respect  to each  Common  Share  that shall  become
outstanding  between the Record Date and the earliest of the Distribution  Date,
the Redemption Date and the Final Expiration Date (as such terms are hereinafter
defined).

Accordingly,  in consideration of the premises and the mutual  agreements herein
set forth, the parties hereby agree as follows:

Section 1. Certain  Definitions.
- --------------------------------

For purposes of this Agreement, the following terms have the meanings indicated:

(a)  "Acquiring  Person"  shall  mean any  Person  (as such term is  hereinafter
defined) who or which,  together with all  Affiliates  and  Associates  (as such
terms are hereinafter defined) of such Person, shall be the Beneficial Owner (as
such term is  hereinafter  defined)  of 15% or more of the Common  Shares of the
Company then outstanding,  but shall not include the Company, any Subsidiary (as
such term is hereinafter  defined) of the Company,  any employee benefit plan of
the Company or any  Subsidiary  of the  Company,  or any entity  holding  Common
Shares  for or  pursuant  to the  terms of any such  plan.  Notwithstanding  the
foregoing,  no Person  shall  become an  "Acquiring  Person" as the result of an
acquisition  of Common  Shares by the Company  which,  by reducing the number of
shares  outstanding,  increases the proportionate  number of shares beneficially
owned by such  Person to 15% or more of the Common  Shares of the  Company  then
outstanding;  provided,  however,  that if a Person shall become the  Beneficial
Owner of 15% or more of the Common  Shares of the Company  then  outstanding  by
reason of share  purchases by the Company and shall,  after such share purchases
by the Company,  become the Beneficial Owner of any additional  Common Shares of
the  Company,  then such  Person  shall be deemed to be an  "Acquiring  Person".
Notwithstanding  the  foregoing,  if the  Board  of  Directors  of  the  Company
determines  in good  faith that a Person who would  otherwise  be an  "Acquiring
Person", as defined pursuant to the foregoing  provisions of this paragraph (a),
has  become  such  inadvertently,   and  such  Person  divests  as  promptly  as
practicable  a sufficient  number of Common  Shares so that such Person would no
longer be an "Acquiring Person," as defined pursuant to the foregoing provisions
of this  paragraph (a), then such Person shall not be deemed to be an "Acquiring
Person" for any purposes of this Agreement.

(b) "Affiliate" and "Associate"  shall have the respective  meanings ascribed to
such  terms  in Rule  12b-2 of the  General  Rules  and  Regulations  under  the
Securities  Exchange Act of 1934, as amended (the "Exchange  Act"), as in effect
on the date of this Agreement.

(c) A Person  shall be deemed the  "Beneficial  Owner" of and shall be deemed to
"beneficially own" any securities:

(i)  which  such  Person  or any  of  such  Person's  Affiliates  or  Associates
beneficially owns, directly or indirectly;

(ii) which such Person or any of such Person's  Affiliates or Associates has (A)
the right to acquire  (whether  such right is  exercisable  immediately  or only
after  the  passage  of  time)  pursuant  to  any   agreement,   arrangement  or
understanding (other than customary agreements with and between underwriters and
selling  group  members  with  respect  to  a  bona  fide  public   offering  of
securities),  or upon the exercise of conversion rights, exchange rights, rights
(other than these Rights), warrants or options, or otherwise; provided, however,
that a Person shall not be deemed the  Beneficial  Owner of, or to  beneficially
own,  securities  tendered  pursuant to a tender or exchange offer made by or on
behalf of such Person or any of such Person's  Affiliates  or  Associates  until
such tendered securities are accepted for purchase or exchange; or (B) the right
to vote  pursuant to any  agreement,  arrangement  or  understanding;  provided,
however,  that a Person  shall  not be  deemed  the  Beneficial  Owner of, or to
beneficially own, any security if the agreement, arrangement or understanding to
vote such security (1) arises solely from a revocable  proxy or consent given to
such Person in response to a public proxy or consent  solicitation made pursuant
to, and in accordance  with, the applicable  rules and  regulations  promulgated
under the Exchange Act and (2) is not also then reportable on Schedule 13D under
the Exchange Act (or any comparable or successor report); or

(iii) which are beneficially owned, directly or indirectly,  by any other Person
with which such Person or any of such Person's  Affiliates or Associates has any
agreement,  arrangement or understanding  (other than customary  agreements with
and between  underwriters  and selling group members with respect to a bona fide
public  holding,  voting  (except to the extent  contemplated  by the proviso to
Section   1(c)(ii)(B))   or  disposing  of  any   securities   of  the  Company.

Notwithstanding  anything in this  definition  of  Beneficial  Ownership  to the
contrary,  the phrase "then outstanding," when used with reference to a Person's
Beneficial Ownership of securities of the Company, shall mean the number of such
securities  then  issued  and  outstanding  together  with  the  number  of such
securities not then actually issued and  outstanding  which such Person would be
deemed to own  beneficially  hereunder.

(d) "Business Day" shall mean any day other than a Saturday,  a Sunday, or a day
on which  banking  institutions  in the  State of  Illinois  are  authorized  or
obligated  by law or  executive  order to close.

(e) "Close of business" on any given date shall mean 5:00 P.M., Chicago time, on
such date; provided,  however,  that if such date is not a Business Day it shall
mean 5:00 P.M., Chicago time, on the next succeeding Business Day.

(f) "Common  Shares"  when used with  reference  to the  Company  shall mean the
shares of common  stock,  par value  $0.10 per share,  of the  Company.  "Common
Shares" when used with reference to any Person other than the Company shall mean
the capital stock (or, in the case of an unincorporated  entity,  the equivalent
equity  interest)  which is not  preferred as to the payment of dividends or the
distribution of assets in any voluntary or involuntary  liquidation  over shares
of any  other  class of  capital  stock  (or,  in the case of an  unincorporated
entity, the equivalent equity interest);  provided, however, that if such Person
has more than one class of Common Stock, "Common Share" shall mean shares of the
class which is registered  under Section 12 or Section 15(d) of the Exchange Act
(or any comparable or successor Sections); (ii) if such Person has more than one
class of Common Stock which is so registered,  "Common Shares" shall mean shares
of the class with the  greatest  voting power of such Person (as compared to the
economic  interest  represented  by such  class);  and (iii) if such Person is a
subsidiary of another  Person,  "Common  Shares" shall mean the Common Shares of
the Person which ultimately controls such first-mentioned Person.

(g) "Distribution  Date" shall have the meaning set forth in Section 3.

(h) "Final  Expiration  Date" shall have the meaning set forth in Section 7.

(i) "Person" shall mean any individual,  firm,  corporation or other entity, and
shall include any successor (by merger or otherwise) of such entity.

(j)  "Preferred  Shares"  shall mean  shares of Junior  Participating  Preferred
Stock,  Series D, par value $1 per share,  of the Company  having the rights and
preferences  set forth in the Form of  Certificate of  Designations  attached to
this Agreement as Exhibit A.

(k)  "Purchase Price" shall have the meaning set forth in Section 4.

(l)  "Redemption Date" shall have the meaning set forth in Section 7.

(m)  "Redemption Price" shall have the meaning set forth in Section 23(a).

(n) "Shares  Acquisition Date" shall mean the first date of public  announcement
by the Company or an Acquiring Person that an Acquiring Person has become such.

(o)  "Subsidiary"  of any Person shall mean any  corporation  or other entity of
which a majority of the voting power of the voting  equity  securities or equity
interest is owned, directly or indirectly, by such Person.

Section 2.  Appointment of Rights Agent.
- ----------------------------------------

The Company hereby appoints the Rights Agent to act as agent for the Company and
the holders of the Rights (who, in accordance with Section 3 hereof, shall prior
to the Distribution Date also be the holders of the Common Shares) in accordance
with the terms and conditions  hereof,  and the Rights Agent hereby accepts such
appointment.  The Company may from time to time appoint such co-Rights Agents as
it may deem necessary or desirable.

Section 3. Issue of Right Certificates.
- ---------------------------------------

(a) Until the earlier of the tenth day after the Shares Acquisition Date or (ii)
the tenth business day (or such later date as may be determined by action of the
Board of Directors prior to such time as any Person becomes an Acquiring Person)
after the date of the  commencement  by any Person (other than the Company,  any
Subsidiary  of the Company,  any employee  benefit plan of the Company or of any
Subsidiary of the Company or any entity holding Common Shares for or pursuant to
the  terms of any such  plan) of, or of the  first  public  announcement  of the
intention of any Person (other than the Company,  any Subsidiary of the Company,
any employee  benefit plan of the Company or of any Subsidiary of the Company or
any entity  holding Common Shares for or pursuant to the terms of any such plan)
to commence,  a tender or exchange offer the  consummation of which would result
in any Person becoming the Beneficial Owner of Common Shares  aggregating 15% or
more of the then  outstanding  Common Shares  (including  any such date which is
after the date of this  Agreement  and prior to the issuance of the Rights;  the
earlier of such dates being herein referred to as the "Distribution  Date"), (x)
the Rights will be evidenced (subject to the provisions of paragraph (b) of this
Section 3) by the certificates for Common Shares  registered in the names of the
holders  thereof  (which   certificates   shall  also  be  deemed  to  be  Right
Certificates)  and not by  separate  Right  Certificates,  and (y) the  right to
receive Right  Certificates  will be  transferable  only in connection  with the
transfer of Common Shares. As soon as practicable  after the Distribution  Date,
the Company will prepare and execute, the Rights Agent will countersign, and the
Company will send or cause to be sent (and the Rights Agent will,  if requested,
send, at the expense of the Company), by first-class,  insured,  postage-prepaid
mail,  to each record holder of Common Shares as of the close of business on the
Distribution  Date,  at the address of such  holder  shown on the records of the
Company, a Right  Certificate,  in substantially the form of Exhibit B hereto (a
"Right Certificate"),  evidencing one Right for each Common Share so held. As of
the  Distribution  Date,  the  Rights  will be  evidenced  solely by such  Right
Certificates.

(b) On or prior to the Record Date, or as soon as  practicable  thereafter,  the
Company will send a copy of a Summary of Rights to Purchase Preferred Shares, in
substantially  the form of  Exhibit  C hereto  (the  "Summary  of  Rights"),  by
first-class,  postage-prepaid mail, to each record holder of Common Shares as of
the close of business on the Record Date, at the address of such holder shown on
the records of the  Company.  With  respect to  certificates  for Common  Shares
outstanding as of the Record Date, until the Distribution  Date, the Rights will
be  evidenced  by such  certificates  registered  in the  names  of the  holders
thereof.  Until the Distribution  Date (or the earlier of the Redemption Date or
the Final  Expiration  Date),  the surrender for transfer of any certificate for
Common  Shares  outstanding  on the Record  Date,  with or without a copy of the
Summary of Rights  attached  thereto,  shall also constitute the transfer of the
Rights associated with the Common Shares represented  thereby.

(c) Certificates for Common Shares which become outstanding (including,  without
limitation,  reacquired  Common Shares  referred to in the last sentence of this
paragraph  (c))  after  the  Record  Date  but  prior  to  the  earliest  of the
Distribution  Date, the Redemption Date or the Final  Expiration Date shall have
impressed on, printed on, written on or otherwise  affixed to them the following
legend:

This certificate also evidences and entitles the holder hereof to certain rights
as set forth in a Rights Agreement  between USG Corporation and Harris Trust and
Savings Bank, dated as of March 27, 1998, (the "Rights Agreement"), the terms of
which are hereby incorporated herein by reference and a copy of which is on file
at  the  principal   executive   offices  of  USG  Corporation.   Under  certain
circumstances,  as set  forth  in the  Rights  Agreement,  such  Rights  will be
evidenced  by  separate  certificates  and will no longer be  evidenced  by this
certificate.  USG Corporation will mail to the holder of this certificate a copy
of the Rights  Agreement  without  charge  after  receipt  of a written  request
therefor.  Under certain  circumstances,  as set forth in the Rights  Agreement,
Rights  beneficially  owned by  Acquiring  Persons  (as  defined  in the  Rights
Agreement) and any subsequent holder of such rights, may become null and void.

Until the  Distribution  Date,  the Rights  associated  with the  Common  Shares
represented by such certificates shall be evidenced by such certificates  alone,
and the surrender for transfer of any such certificate shall also constitute the
transfer of the Rights associated with the Common Shares represented thereby. In
the event that the Company  purchases  or acquires  any Common  Shares after the
Record Date but prior to the Distribution  Date, any Rights associated with such
Common Shares shall be deemed canceled and retired so that the Company shall not
be entitled to exercise any Rights  associated  with the Common Shares which are
no longer outstanding.

Section 4. Form of Right Certificates.
- --------------------------------------

The Right  Certificates (and the forms of election to purchase  Preferred Shares
and of assignment to be printed on the reverse  thereof) shall be  substantially
the same as  Exhibit  B hereto  and may have  such  marks of  identification  or
designation and such legends,  summaries or endorsements  printed thereon as the
Company may deem appropriate and as are not inconsistent  with the provisions of
this Agreement,  or as may be required to comply with any applicable law or with
any rule or regulation  made pursuant  thereto or with any rule or regulation of
any stock  exchange  on which the Rights may from time to time be listed,  or to
conform to usage.  Subject  to the  provisions  of Section 22 hereof,  the Right
Certificates  shall  entitle the holders  thereof to purchase such number of one
one-hundredths  of a Preferred  Share as shall be set forth therein at the price
per one  one-hundredth  of a Preferred  Share set forth  therein (the  "Purchase
Price"),  but the number of such shares and the Purchase  Price shall be subject
to adjustment as provided herein.

Section 5. Countersignature and Registration.
- ---------------------------------------------

The  Right  Certificates  shall be  executed  on behalf  of the  Company  by its
Chairman of the Board, President,  or any Vice President,  either manually or by
facsimile signature,  and have affixed thereto the Company's seal or a facsimile
thereof  which shall be attested by the  Secretary or an Assistant  Secretary of
the Company,  either manually or by facsimile signature.  The Right Certificates
shall not be valid for any purpose  unless  countersigned  by the Rights  Agent,
either  manually or by facsimile  signature.  In case any officer of the Company
who shall  have  signed  any of the Right  Certificates  shall  cease to be such
officer of the Company before  countersignature by the Rights Agent and issuance
and  delivery by the  Company,  such Right  Certificates,  nevertheless,  may be
countersigned  by the Rights Agent and issued and  delivered by the Company with
the  same  force  and  effect  as  though  the  person  who  signed  such  Right
Certificates  had not ceased to be such  officer of the  Company;  and any Right
Certificate  may be signed on behalf of the  Company by any person  who,  at the
actual  date of the  execution  of such  Right  Certificate,  shall  be a proper
officer of the Company to sign such Right  Certificate,  although at the date of
the execution of this Rights Agreement any such person was not such an officer.

Following the Distribution Date, the Rights Agent will keep or cause to be kept,
at its  principal  office,  books for  registration  and  transfer  of the Right
Certificates issued hereunder.  Such books shall show the names and addresses of
the respective holders of the Right Certificates, the number of Rights evidenced
on its face by each of the Right  Certificates and the date of each of the Right
Certificates.

Section 6. Transfer,  Split Up, Combination and Exchange of Right  Certificates;
- --------------------------------------------------------------------------------
Mutilated, Destroyed, Lost or Stolen Right Certificates.
- --------------------------------------------------------

Subject to the  provisions of Section 14 hereof,  at any time after the close of
business on the  Distribution  Date, and at or prior to the close of business on
the  earlier of the  Redemption  Date or the Final  Expiration  Date,  any Right
Certificate or Right Certificates  (other than Right  Certificates  representing
Rights that have become void pursuant to Section  11(a)(ii)  hereof or that have
been  exchanged  pursuant  to Section 24 hereof) may be  transferred,  split up,
combined or  exchanged  for another  Right  Certificate  or Right  Certificates,
entitling the registered holder to purchase a like number of one  one-hundredths
of a Preferred Share as the Right Certificate or Right Certificates  surrendered
then  entitled  such  holder to  purchase.  Any  registered  holder  desiring to
transfer,  split  up,  combine  or  exchange  any  Right  Certificate  or  Right
Certificates  shall make such request in writing  delivered to the Rights Agent,
and  shall  surrender  the  Right  Certificate  or  Right   Certificates  to  be
transferred,  split up,  combined or  exchanged at the  principal  office of the
Rights  Agent in Chicago,  Illinois.  Neither  the Rights  Agent nor the Company
shall be obligated to take any action whatsoever with respect to the transfer of
any such surrendered  Right  Certificate  until the registered holder shall have
completed and signed the certificate  contained in the form of assignment on the
reverse side of such Right  Certificate  and shall have provided such additional
evidence of the identity of the Beneficial Owner (or former Beneficial Owner) or
Affiliates  or  Associates  thereof as the  Company  shall  reasonably  request.
Thereupon the Rights Agent shall  countersign and deliver to the person entitled
thereto a Right  Certificate  or Right  Certificates,  as the case may be, as so
requested.  The Company may require payment of a sum sufficient to cover any tax
or  governmental  charge that may be imposed in  connection  with any  transfer,
split up, combination or exchange of Right Certificates.

Upon  receipt  by the  Company  and the  Rights  Agent  of  evidence  reasonably
satisfactory  to them of the loss,  theft,  destruction or mutilation of a Right
Certificate,  and,  in case of  loss,  theft or  destruction,  of  indemnity  or
security  reasonably  satisfactory  to  them,  and,  at the  Company's  request,
reimbursement  to the Company and the Rights  Agent of all  reasonable  expenses
incidental  thereto,  and upon surrender to the Rights Agent and cancellation of
the Right  Certificate  if  mutilated,  the Company  will make and deliver a new
Right  Certificate  of like  tenor  to the  Rights  Agent  for  delivery  to the
registered holder in lieu of the Right Certificate so lost, stolen, destroyed or
mutilated.

Section 7. Exercise of Rights;  Purchase Price;  Expiration Date of Rights.
- ---------------------------------------------------------------------------

(a) The  registered  holder of any Right  Certificate  may  exercise  the Rights
evidenced  thereby (except as otherwise  provided herein) in whole or in part at
any time after the  Distribution  Date upon surrender of the Right  Certificate,
with the form of election to purchase on the reverse side thereof duly executed,
to the Rights  Agent at the  principal  office of the Rights  Agent in  Chicago,
Illinois, together with payment of the Purchase Price for each one one-hundredth
of a Preferred  Share as to which the Rights are  exercised,  at or prior to the
earliest  of the close of  business  on March 27,  2008 (the  "Final  Expiration
Date"), (ii) the time at which the Rights are redeemed as provided in Section 23
hereof  (the  "Redemption  Date"),  or (iii) the time at which  such  Rights are
exchanged as provided in Section 24 hereof.

(b)  The  Purchase  Price  for  each  one  one-hundredth  of a  Preferred  Share
purchasable  pursuant to the exercise of a Right shall initially be $200,  shall
be  subject  to  adjustment  from time to time as  provided  in Section 11 or 13
hereof and shall be payable in lawful  money of the United  States of America in
accordance with paragraph (c) below.

(c) Upon receipt of a Right Certificate  representing  exercisable  Rights, with
the form of election to purchase duly  executed,  accompanied  by payment of the
Purchase  Price  for the  shares  to be  purchased  and an  amount  equal to any
applicable  transfer  tax  required  to be paid  by the  holder  of  such  Right
Certificate in accordance  with Section 9 hereof in cash, or by certified  check
or cashier's  check payable to the order of the Company,  the Rights Agent shall
thereupon  promptly (A)  requisition  from any transfer  agent of the  Preferred
Shares  certificates  for the number of Preferred Shares to be purchased and the
Company hereby irrevocably authorizes its transfer agent to comply with all such
requests,  or (B)  requisition  from the depositary  agent  depositary  receipts
representing such number of one one-hundredths of a Preferred Share as are to be
purchased (in which case  certificates for the Preferred  Shares  represented by
such  receipts  shall be  deposited by the  transfer  agent with the  depositary
agent) and the Company hereby  directs the depositary  agent to comply with such
request, (ii) when appropriate,  requisition from the Company the amount of cash
to be paid in lieu of issuance of fractional  shares in accordance  with Section
14 hereof,  (iii) after receipt of such  certificates  or  depositary  receipts,
cause the same to be delivered to or upon the order of the registered  holder of
such Right Certificate, registered in such name or names as may be designated by
such holder and (iv) when  appropriate,  after receipt,  deliver such cash to or
upon the order of the registered holder of such Right Certificate.

(d) In case the registered  holder of any Right  Certificate shall exercise less
than all the Rights evidenced thereby, a new Right Certificate evidencing Rights
equivalent  to the Rights  remaining  unexercised  shall be issued by the Rights
Agent  to the  registered  holder  of  such  Right  Certificate  or to his  duly
authorized assigns, subject to the provisions of Section 14 hereof.

Section  8.  Cancellation  and  Destruction  of Right  Certificates.
- --------------------------------------------------------------------

All Right Certificates surrendered for the purpose of exercise,  transfer, split
up,  combination or exchange  shall,  if surrendered to the Company or to any of
its agents,  be delivered to the Rights  Agent for  cancellation  or in canceled
form, or, if  surrendered  to the Rights Agent,  shall be canceled by it, and no
Right Certificates shall be issued in lieu thereof except as expressly permitted
by any of the provisions of this Rights Agreement.  The Company shall deliver to
the Rights Agent for cancellation and retirement,  and the Rights Agent shall so
cancel and retire,  any other  Right  Certificate  purchased  or acquired by the
Company otherwise than upon the exercise thereof. The Rights Agent shall deliver
all canceled Right Certificates to the Company, or shall, at the written request
of the Company, destroy such canceled Right Certificates, and in such case shall
deliver a certificate of destruction thereof to the Company.

Section 9.  Reservation  and  Availability  of  Preferred  Shares.
- ------------------------------------------------------------------

The Company  covenants  and agrees  that it will cause to be  reserved  and kept
available out of its authorized and unissued  Preferred  Shares or any Preferred
Shares  held in its  treasury,  the  number  of  Preferred  Shares  that will be
sufficient  to  permit  the  exercise  in  full  of all  outstanding  Rights  in
accordance with Section 7.

So long as the  Preferred  Shares  issuable  upon the  exercise of Rights may be
listed on any  national  securities  exchange,  the  Company  shall use its best
efforts to cause, from and after such time as the Rights become exercisable, all
shares  reserved for such  issuance to be listed on such  exchange upon official
notice of issuance upon such exercise.

The  Company  covenants  and agrees  that it will take all such action as may be
necessary to ensure that all Preferred  Shares delivered upon exercise of Rights
shall,  at the time of delivery of the  certificates  for such Preferred  Shares
(subject to payment of the Purchase Price),  be duly and validly  authorized and
issued and fully paid and nonassessable shares.

The Company  further  covenants and agrees that it will pay when due and payable
any and all federal and state transfer taxes and charges which may be payable in
respect  of the  issuance  or  delivery  of  the  Right  Certificates  or of any
Preferred Shares upon the exercise of Rights. The Company shall not, however, be
required to pay any transfer tax which may be payable in respect of any transfer
or delivery of Right  Certificates  to a person  other than,  or the issuance or
delivery of  certificates or depositary  receipts for the Preferred  Shares in a
name  other  than  that of,  the  registered  holder  of the  Right  Certificate
evidencing  Rights  surrendered  for  exercise  or to  issue or to  deliver  any
certificates  or depositary  receipts for Preferred  Shares upon the exercise of
any Rights  until any such tax shall have been paid (any such tax being  payable
by the holder of such Right  Certificate  at the time of  surrender) or until it
has been established to the Company's  reasonable  satisfaction that no such tax
is due.

Section  10.  Preferred  Shares  Record  Date.
- ----------------------------------------------

Each person in whose name any  certificate  for Preferred  Shares is issued upon
the  exercise  of Rights  shall for all  purposes  be deemed to have  become the
holder  of record of the  Preferred  Shares  represented  thereby  on,  and such
certificate shall be dated, the date upon which the Right Certificate evidencing
such  Rights was duly  surrendered  and payment of the  Purchase  Price (and any
applicable transfer taxes) was made; provided, however, that if the date of such
surrender and payment is a date upon which the Preferred  Shares  transfer books
of the Company are closed, such person shall be deemed to have become the record
holder  of such  shares  on,  and  such  certificate  shall be  dated,  the next
succeeding  Business Day on which the  Preferred  Shares  transfer  books of the
Company are open.  Prior to the exercise of the Rights  evidenced  thereby,  the
holder of a Right Certificate shall not be entitled to any rights of a holder of
Preferred Shares for which the Rights shall be exercisable,  including,  without
limitation, the right to vote, to receive dividends or other distributions or to
exercise any preemptive  rights, and shall not be entitled to receive any notice
of any proceedings of the Company, except as provided herein.

Section 11. Adjustment of Purchase Price,  Number of Shares or Number of Rights.
- --------------------------------------------------------------------------------

The Purchase Price, the number of Preferred Shares covered by each Right and the
number of Rights  outstanding  are  subject to  adjustment  from time to time as
provided in this Section 11.

(a) (i) In the  event  the  Company  shall  at any time  after  the date of this
Agreement  (A) declare a dividend on the Preferred  Shares  payable in Preferred
Shares,  (B)  subdivide  the  outstanding  Preferred  Shares,  (C)  combine  the
outstanding  Preferred  Shares into a smaller number of Preferred  Shares or (D)
issue any shares of its capital  stock in a  reclassification  of the  Preferred
Shares (including any such  reclassification  in connection with a consolidation
or merger in which the  Company is the  continuing  or  surviving  corporation),
except as otherwise provided in this Section 11(a), the Purchase Price in effect
at the time of the record  date for such  dividend or of the  effective  date of
such subdivision,  combination or  reclassification,  and the number and kind of
shares of capital stock issuable on such date, shall be proportionately adjusted
so that the holder of any Right  exercised  after such time shall be entitled to
receive the aggregate  number and kind of shares of capital stock which, if such
Right had been exercised  immediately  prior to such date and at a time when the
Preferred  Shares  transfer  books of the Company were open, he would have owned
upon such  exercise  and been  entitled  to receive by virtue of such  dividend,
subdivision,  combination or  reclassification;  provided,  however,  that in no
event shall the  consideration to be paid upon the exercise of one Right be less
than the  aggregate  par value of the  shares of  capital  stock of the  Company
issuable upon exercise of one Right.

(ii) Subject to Section 24 of this Agreement, in the event any Person becomes an
Acquiring  Person,  each  holder  of a Right  shall  thereafter  have a right to
receive,  upon  exercise  thereof at a price equal to the then current  Purchase
Price  multiplied by the number of one  one-hundredths  of a Preferred Share for
which  a Right  is then  exercisable,  in  accordance  with  the  terms  of this
Agreement and in lieu of Preferred  Shares,  such number of Common Shares of the
Company as shall equal the result  obtained by (x)  multiplying the then current
Purchase  Price by the number of one  one-hundredths  of a  Preferred  Share for
which a Right is then  exercisable  and dividing  that product by (y) 50% of the
then current per share market price of the Company's  Common Shares  (determined
pursuant to Section 11(d)  hereof) on the date of the  occurrence of such event.
In the event that any Person  shall  become an  Acquiring  Person and the Rights
shall then be  outstanding,  the Company  shall not take any action  which would
eliminate or diminish the benefits  intended to be afforded by the Rights.  From
and after the occurrence of such event,  any Rights that are or were acquired or
beneficially  owned by any  Acquiring  Person (or any  Associate or Affiliate of
such  Acquiring  Person)  shall  be void and any  holder  of such  Rights  shall
thereafter  have no right to exercise  such Rights  under any  provision of this
Agreement.  No Right  Certificate  shall be issued  pursuant  to  Section 3 that
represents Rights  beneficially  owned by an Acquiring Person whose Rights would
be void  pursuant  to the  preceding  sentence  or any  Associate  or  Affiliate
thereof;  no Right  Certificate shall be issued at any time upon the transfer of
any Rights to an Acquiring  Person  whose  Rights would be void  pursuant to the
preceding  sentence or any  Associate or Affiliate  thereof or to any nominee of
such  Acquiring  Person,  Associate  or  Affiliate;  and any  Right  Certificate
delivered to the Rights  Agent for transfer to an Acquiring  Person whose Rights
would be void pursuant to the preceding sentence shall be canceled.

(iii) In the event that there shall not be  sufficient  Common Shares issued but
not outstanding or authorized but unissued to permit the exercise in full of the
Rights in accordance  with the foregoing  subparagraph  (ii),  the Company shall
take all such action as may be necessary to authorize  additional  Common Shares
for issuance upon exercise of the Rights. In the event the Company shall,  after
good faith  effort,  be unable to take all such  action as may be  necessary  to
authorize such additional Common Shares, the Company shall substitute,  for each
Common Share that would otherwise be issuable upon exercise of a Right, a number
of Preferred  Shares or fraction  thereof such that the current per share market
price of one Preferred  Share  multiplied by such number or fraction is equal to
the  current  per  share  market  price  of one  Common  Share as of the date of
issuance of such Preferred Shares or fraction thereof.

(b) In case the  Company  shall fix a record  date for the  issuance  of rights,
options or warrants to all holders of  Preferred  Shares  entitling  them (for a
period expiring within 45 calendar days after such record date) to subscribe for
or purchase  Preferred Shares (or shares having the same rights,  privileges and
preferences  as  the  Preferred  Shares  ("equivalent   preferred  shares"))  or
securities convertible into Preferred Shares or equivalent preferred shares at a
price per Preferred Share or equivalent  preferred share (or having a conversion
price per share, if a security  convertible  into Preferred Shares or equivalent
preferred  shares)  less than the then  current  per share  market  price of the
Preferred Shares (as defined in Section 11(d)) on such record date, the Purchase
Price to be in effect after such record date shall be determined by  multiplying
the  Purchase  Price  in  effect  immediately  prior  to such  record  date by a
fraction,  the  numerator  of which  shall be the  number  of  Preferred  Shares
outstanding  on such record date plus the number of  Preferred  Shares which the
aggregate  offering  price  of the  total  number  of  Preferred  Shares  and/or
equivalent  preferred  shares so to be offered  (and/or  the  aggregate  initial
conversion price of the convertible  securities so to be offered) would purchase
at such current market price and the denominator of which shall be the number of
Preferred  Shares  outstanding on such record date plus the number of additional
Preferred  Shares  and/or   equivalent   preferred  shares  to  be  offered  for
subscription  or purchase  (or into which the  convertible  securities  so to be
offered are initially  convertible);  provided,  however, that in no event shall
the  consideration  to be paid upon the  exercise  of one Right be less than the
aggregate par value of the shares of capital stock of the Company  issuable upon
exercise  of one  Right.  In  case  such  subscription  price  may be  paid in a
consideration part or all of which shall be in a form other than cash, the value
of such  consideration  shall be as  determined  in good  faith by the  Board of
Directors of the Company,  whose determination shall be described in a statement
filed with the Rights Agent.  Preferred  Shares owned by or held for the account
of the  Company  shall not be deemed  outstanding  for the  purpose  of any such
computation.  Such adjustment shall be made successively  whenever such a record
date is fixed; and in the event that such rights, options or warrants are not so
issued,  the  Purchase  Price shall be adjusted to be the  Purchase  Price which
would then be in effect if such record date had not been fixed.

(c) In case the Company shall fix a record date for the making of a distribution
to all holders of the Preferred Shares  (including any such distribution made in
connection with a consolidation or merger in which the Company is the continuing
or surviving  corporation)  of evidences of indebtedness or assets (other than a
regular  quarterly cash dividend or a dividend  payable in Preferred  Shares) or
subscription  rights or warrants  (excluding  those referred to in Section 11(b)
hereof),  the  Purchase  Price to be in effect  after such  record date shall be
determined by multiplying the Purchase Price in effect immediately prior to such
record date by a fraction,  the numerator of which shall be the then current per
share market price of the  Preferred  Shares on such record date,  less the fair
market  value (as  determined  in good  faith by the Board of  Directors  of the
Company,  whose  determination  shall be described in a statement filed with the
Rights Agent) of the portion of the assets or evidences of indebtedness so to be
distributed  or of  such  subscription  rights  or  warrants  applicable  to one
Preferred  Share and the  denominator  of which shall be such  current per share
market price of the Preferred Shares; provided,  however, that in no event shall
the  consideration  to be paid upon the  exercise  of one Right be less than the
aggregate  par value of the shares of capital  stock of the Company to be issued
upon exercise of one Right. Such adjustments shall be made successively whenever
such a record date is fixed;  and in the event that such  distribution is not so
made,  the Purchase Price shall again be adjusted to be the Purchase Price which
would then be in effect if such record date had not been fixed.

(d) (i) For the purpose of any  computation  hereunder,  the  "current per share
market  price" of any  security (a  "Security"  for the purpose of this  Section
11(d)) on any date shall be deemed to be the average of the daily closing prices
per share of such Security for the 30 consecutive  Trading Days (as such term is
hereinafter defined) immediately prior to such date; provided, -------- however,
that in the  event  that the  current  per  share  market  price of the  -------
Security is determined  during a period following the announcement by the issuer
of such Security of (A) a dividend or distribution  on such Security  payable in
shares of such Security or securities  convertible into such shares,  or (B) any
subdivision,  combination or  reclassification of such Security and prior to the
expiration  of 30 Trading Days after the  ex-dividend  date for such dividend or
distribution,   or  the  record  date  for  such  subdivision,   combination  or
reclassification,  then,  and in each such case,  the current  per share  market
price shall be  appropriately  adjusted to reflect the current  market price per
share  equivalent of such Security.  The closing price for each day shall be the
last sale price,  regular way, or, in case no such sale takes place on such day,
the average of the closing bid and asked prices,  regular way, in either case as
reported in the principal consolidated transaction reporting system with respect
to securities  listed or admitted to trading on the New York Stock  Exchange or,
if the  Security  is not  listed or  admitted  to  trading on the New York Stock
Exchange, as reported in the principal consolidated transaction reporting system
with respect to securities listed on the principal national  securities exchange
on which the  Security is listed or  admitted to trading or, if the  Security is
not listed or admitted to trading on any national securities exchange,  the last
quoted  price or, if not so  quoted,  the  average of the high bid and low asked
prices in the  over-the-counter  market, as reported by the National Association
of Securities Dealers, Inc. Automated Quotations System ("NASDAQ") or such other
system  then in use,  or, if on any such date the  Security is not quoted by any
such organization,  the average of the closing bid and asked prices as furnished
by a professional  market maker making a market in the Security  selected by the
Board of Directors of the Company.  The term  "Trading  Day" shall mean a day on
which the principal national securities exchange on which the Security is listed
or  admitted  to  trading is open for the  transaction  of  business  or, if the
Security  is not  listed or  admitted  to  trading  on any  national  securities
exchange, a Business Day.

(ii) For the purpose of any computation hereunder,  the"current per share market
price" of the Preferred Shares shall be determined in accordance with the method
set forth in Section 11(d). If the Preferred Shares are not publicly traded, the
"current per share market price" of the Preferred  Shares shall be  conclusively
deemed  to be the  current  per  share  market  price of the  Common  Shares  as
determined  pursuant  to Section  11(d)  (appropriately  adjusted to reflect any
stock split,  stock  dividend or similar  transaction  occurring  after the date
hereof),  multiplied  by one  hundred.  If  neither  the  Common  Shares nor the
Preferred  Shares are publicly  held or so listed or traded,  "current per share
market price" shall mean the fair value per share as determined in good faith by
the Board of Directors of the Company, whose determination shall be described in
a statement filed with the Rights Agent.


(e) No adjustment in the Purchase Price shall be required unless such adjustment
would  require an increase or  decrease  of at least 1% in the  Purchase  Price;
provided,  however,  that any adjustments  which by reason of this Section 11(e)
are not required to be made shall be carried forward and taken
into account in any subsequent  adjustment.  All calculations under this Section
11 shall be made to the nearest  cent or to the nearest one  one-millionth  of a
Preferred Share or one ten-thousandth of any other share or security as the case
may be. Notwithstanding the first sentence of this Section 11(e), any adjustment
required  by this  Section 11 shall be made no later  than the  earlier of three
years from the date of the  transaction  which requires such  adjustment or (ii)
the date of the expiration of the right to exercise any Rights. 

(f) If as a result of an adjustment  made pursuant to Section 11(a) hereof,  the
holder of any Right  thereafter  exercised  shall become entitled to receive any
shares of capital stock of the Company other than Preferred  Shares,  thereafter
the number of such other shares so  receivable  upon exercise of any Right shall
be  subject to  adjustment  from time to time in a manner and on terms as nearly
equivalent as practicable to the provisions with respect to the Preferred Shares
contained  in Section  11(a)  through  (c),  inclusive,  and the  provisions  of
Sections 7, 9, 10 and 13 with  respect to the  Preferred  Shares  shall apply on
like terms to any such other shares.

(g) All Rights  originally  issued by the Company  subsequent to any  adjustment
made to the Purchase Price  hereunder  shall evidence the right to purchase,  at
the adjusted  Purchase Price,  the number of one  one-hundredths  of a Preferred
Share  purchasable from time to time hereunder upon exercise of the Rights,  all
subject to further adjustment as provided herein.

(h) Unless the Company shall have  exercised its election as provided in Section
11, upon each  adjustment of the Purchase Price as a result of the  calculations
made in Sections 11(b) and (c), each Right outstanding  immediately prior to the
making of such adjustment  shall thereafter  evidence the right to purchase,  at
the adjusted  Purchase Price,  that number of one  one-hundredths of a Preferred
Share  (calculated  to the  nearest  one  one-millionth  of a  Preferred  Share)
obtained by multiplying (x) the number of one  one-hundredths of a share covered
by a Right  immediately  prior to this  adjustment by (y) the Purchase  Price in
effect  immediately  prior to such  adjustment  of the  Purchase  Price and (ii)
dividing  the product so obtained by the  Purchase  Price in effect  immediately
after such adjustment of the Purchase Price.

(i) The Company may elect on or after the date of any adjustment of the Purchase
Price to adjust the number of Rights,  in substitution for any adjustment in the
number of one  one-hundredths of a Preferred Share purchasable upon the exercise
of a Right.  Each of the Rights  outstanding after such adjustment of the number
of  Rights  shall be  exercisable  for the  number  of one  one-hundredths  of a
Preferred  Share  for which a Right was  exercisable  immediately  prior to such
adjustment.  Each Right held of record prior to such adjustment of the number of
Rights  shall  become  that  number of Rights  (calculated  to the  nearest  one
ten-thousandth)  obtained by dividing the Purchase  Price in effect  immediately
prior to  adjustment  of the  Purchase  Price by the  Purchase  Price in  effect
immediately  after  adjustment of the Purchase  Price.  The Company shall make a
public  announcement of its election to adjust the number of Rights,  indicating
the record date for the adjustment, and, if known at the time, the amount of the
adjustment  to be made.  This record date may be the date on which the  Purchase
Price is adjusted or any day  thereafter,  but, if the Right  Certificates  have
been  issued,  shall  be at  least 10 days  later  than  the date of the  public
announcement.  If Right  Certificates have been issued,  upon each adjustment of
the number of Rights pursuant to this Section 11, the Company shall, as promptly
as  practicable,  cause  to  be  distributed  to  holders  of  record  of  Right
Certificates  on such  record  date Right  Certificates  evidencing,  subject to
Section 14 hereof, the additional Rights to which such holders shall be entitled
as a result of such adjustment, or, at the option of the Company, shall cause to
be distributed to such holders of record in substitution and replacement for the
Right  Certificates  held by such holders prior to the date of  adjustment,  and
upon  surrender  thereof,  if required by the  Company,  new Right  Certificates
evidencing  all the Rights to which such  holders  shall be entitled  after such
adjustment.  Right  Certificates so to be distributed shall be issued,  executed
and  countersigned  in the manner provided for herein and shall be registered in
the names of the  holders of record of Right  Certificates  on the  record  date
specified in the public announcement.

(j) Irrespective of any adjustment or change in the Purchase Price or the number
of one  one-hundredths  of a Preferred  Share  issuable upon the exercise of the
Rights, the Right Certificates theretofore and thereafter issued may continue to
express the Purchase Price and the number of one  one-hundredths  of a Preferred
Share which were expressed in the initial Right Certificates issued hereunder.

(k) Before  taking  any  action  that would  cause an  adjustment  reducing  the
Purchase  Price below one  one-hundredth  of the then par value,  if any, of the
Preferred  Shares  issuable upon exercise of the Rights,  the Company shall take
any corporate  action which may, in the opinion of its counsel,  be necessary in
order  that  the  Company   may  validly  and  legally   issue  fully  paid  and
nonassessable Preferred Shares at such adjusted Purchase Price.

(l) In any case in which this Section 11 shall require that an adjustment in the
Purchase Price be made effective as of a record date for a specified  event, the
Company may elect to defer until the occurrence of such event the issuing to the
holder of any Right exercised after such record date of the Preferred Shares and
other capital stock or  securities  of the Company,  if any,  issuable upon such
exercise  over and  above  the  Preferred  Shares  and  other  capital  stock or
securities of the Company,  if any,  issuable upon such exercise on the basis of
the Purchase Price in effect prior to such adjustment;  provided,  however, that
the  Company  shall  deliver  to such  holder a due  bill or  other  appropriate
instrument evidencing such holder's right to receive such additional shares upon
the occurrence of the event requiring such adjustment.

(m)  Anything in this Section 11 to the  contrary  notwithstanding,  the Company
shall be entitled to make such  reductions in the Purchase Price, in addition to
those  adjustments  expressly  required by this Section 11, as and to the extent
that it in its sole discretion shall determine to be advisable in order that any
consolidation or subdivision of the Preferred  Shares,  issuance wholly for cash
of any Preferred  Shares at less than the current market price,  issuance wholly
for cash of Preferred  Shares or securities which by their terms are convertible
into or exchangeable for Preferred Shares, dividends on Preferred Shares payable
in  Preferred  Shares or  issuance of rights,  options or  warrants  referred to
hereinabove  in Section  11(b),  hereafter made by the Company to holders of its
Preferred Shares shall not be taxable to such stockholders.

(n) Anything in this  Agreement to the  contrary  notwithstanding,  in the event
that at any time after the date of this Agreement and prior to the  Distribution
Date, the Company shall declare or pay any dividend on the Common Shares payable
in Common Shares or (ii) effect a subdivision,  combination or  consolidation of
the Common Shares (by reclassification or otherwise than by payment of dividends
in Common Shares) into a greater or lesser number of Common Shares,  then in any
such case (A) the number of one  one-hundredths of a Preferred Share purchasable
after such event upon  proper  exercise  of each Right  shall be  determined  by
multiplying the number of one one-hundredths of a Preferred Share so purchasable
immediately  prior to such event by a fraction,  the  numerator  of which is the
number  of Common  Shares  outstanding  immediately  before  such  event and the
denominator  of which is the  number of Common  Shares  outstanding  immediately
after such event, and (B) each Common Share  outstanding  immediately after such
event  shall have issued  with  respect to it that  number of Rights  which each
Common Share outstanding immediately prior to such event had issued with respect
to it.  The  adjustments  provided  for in  this  Section  11(n)  shall  be made
successively whenever such a dividend is declared or paid or such a subdivision,
combination or consolidation is effected.

Section 12. Certificate of Adjusted Purchase Price or Number of Shares.
- -----------------------------------------------------------------------

Whenever  an  adjustment  is made as  provided  in Section 11 or 13 hereof,  the
Company shall promptly (a) prepare a certificate  setting forth such adjustment,
and a brief statement of the facts accounting for such adjustment, (b) file with
the  Rights  Agent and with each  transfer  agent for the  Common  Shares or the
Preferred  Shares  a copy of such  certificate,  and  (C)  mail a brief  summary
thereof to each holder of a Right  Certificate  in  accordance  with  Section 25
hereof.  The  Rights  Agent  shall be fully  protected  in  relying  on any such
certificate and on any adjustment therein contained,  and shall not be obligated
or responsible for  calculating  any adjustment,  nor shall it be deemed to have
knowledge of such an  adjustment  unless and until it shall have  received  such
certificate.

Section  13.  Consolidation,  Merger or Sale or  Transfer  of Assets or  Earning
- --------------------------------------------------------------------------------
Power.
- ------

In the event,  directly or indirectly,  at any time after a Person has become an
Acquiring  Person,  (a) the Company  shall  consolidate  with, or merge with and
into, any other Person,  (b) any Person shall  consolidate with the Company,  or
merge with and into the  Company  and the  Company  shall be the  continuing  or
surviving corporation of such merger and, in connection with such merger, all or
part of the Common  Shares shall be changed into or exchanged for stock or other
securities  of any other Person (or the Company) or cash or any other  property,
or (C) the  Company  shall  sell or  otherwise  transfer  (or one or more of its
Subsidiaries  shall sell or otherwise  transfer),  in one or more  transactions,
assets or earning power  aggregating  50% or more of the assets or earning power
of the Company and its Subsidiaries (taken as a whole) to any other Person other
than the Company or one or more of its wholly-owned  Subsidiaries,  then, and in
each such case,  proper  provision  shall be made so that each holder of a Right
(except  as  otherwise  provided  herein)  shall  thereafter  have the  right to
receive, upon the exercise thereof at a price equal to the then current Purchase
Price  multiplied by the number of one  one-hundredths  of a Preferred Share for
which  a Right  is then  exercisable,  in  accordance  with  the  terms  of this
Agreement and in lieu of Preferred Shares,  such number of Common Shares of such
other Person  (including  the Company as successor  thereto or as the  surviving
corporation)  as shall  equal the result  obtained by (A)  multiplying  the then
current Purchase Price by the number of one  one-hundredths of a Preferred Share
for which a Right is then  exercisable  and dividing  that product by (B) 50% of
the then  current  per share  market  price of the  Common  Shares of such other
Person (determined pursuant to Section 11(d) hereof) on the date of consummation
of such consolidation,  merger, sale or transfer; (ii) the issuer of such Common
Shares  shall  thereafter  be liable for,  and shall  assume,  by virtue of such
consolidation,  merger, sale or transfer,  all the obligations and duties of the
Company pursuant to this Agreement; (iii) the term "Company" shall thereafter be
deemed to refer to such  issuer;  and (iv) such  issuer  shall  take such  steps
(including,  but not limited to, the  reservation of a sufficient  number of its
Common  Shares in  accordance  with  Section 9 hereof) in  connection  with such
consummation  as may be  necessary  to assure that the  provisions  hereof shall
thereafter be  applicable,  as nearly as  reasonably  may be, in relation to the
Common  Shares  thereafter  deliverable  upon the  exercise of the  Rights.  The
Company shall not consummate any such  consolidation,  merger,  sale or transfer
unless  prior  thereto  the  Company and such  issuer  shall have  executed  and
delivered to the Rights Agent a supplemental agreement so providing. The Company
shall not enter into any  transaction of the kind referred to in this Section 13
if at the time of such transaction there are any rights,  warrants,  instruments
or securities  outstanding or any agreements or arrangements  which, as a result
of the  consummation  of such  transaction,  would  eliminate  or  substantially
diminish the benefits  intended to be afforded by the Rights.  The provisions of
this Section 13 shall similarly apply to successive mergers or consolidations or
sales or other transfers.

Section 14. Fractional Rights and Fractional Shares.
- ----------------------------------------------------

(a) The  Company  shall  not be  required  to issue  fractions  of  Rights or to
distribute Right Certificates which evidence  fractional Rights. In lieu of such
fractional  Rights,  there shall be paid to the registered  holders of the Right
Certificates  with regard to which such  fractional  Rights  would  otherwise be
issuable,  an amount in cash equal to the same  fraction of the  current  market
value of a whole  Right.  For the purposes of this  Section  14(a),  the current
market  value of a whole Right shall be the closing  price of the Rights for the
Trading Day immediately  prior to the date on which such fractional Rights would
have been  otherwise  issuable.  The closing price for any day shall be the last
sale price,  regular  way, or, in case no such sale takes place on such day, the
average of the  closing  bid and asked  prices,  regular  way, in either case as
reported in the principal consolidated transaction reporting system with respect
to securities  listed or admitted to trading on the New York Stock  Exchange or,
if the  Rights  are not  listed or  admitted  to  trading  on the New York Stock
Exchange, as reported in the principal consolidated transaction reporting system
with respect to securities listed on the principal national  securities exchange
on which the Rights are listed or  admitted to trading or, if the Rights are not
listed or  admitted to trading on any  national  securities  exchange,  the last
quoted  price or, if not so  quoted,  the  average of the high bid and low asked
prices in the  over-the-counter  market,  as  reported  by NASDAQ or such  other
system then in use or, if on any such date the Rights are not quoted by any such
organization,  the average of the closing bid and asked prices as furnished by a
professional market maker making a market in the Rights selected by the Board of
Directors of the  Company.  If on any such date no such market maker is making a
market in the Rights, the fair value of the Rights on such date as determined in
good faith by the Board of Directors of the Company shall be used.

(b) The Company  shall not be required to issue  fractions of  Preferred  Shares
(other than fractions  which are integral  multiples of one  one-hundredth  of a
Preferred Share) upon exercise of the Rights or to distribute certificates which
evidence  fractional  Preferred  Shares (other than fractions which are integral
multiples of one  one-hundredth  of a Preferred  Share).  Fractions of Preferred
Shares in integral  multiples of one  one-hundredth of a Preferred Share may, at
the election of the Company, be evidenced by depositary receipts, pursuant to an
appropriate  agreement  between  the Company  and a  depositary  selected by it,
provided that such agreement  shall provide that the holders of such  depositary
receipts shall have all the rights, privileges and preferences to which they are
entitled  as  beneficial  owners of the  Preferred  Shares  represented  by such
depositary  receipts.  In lieu  of  fractional  Preferred  Shares  that  are not
integral  multiples of one one-hundredth of a Preferred Share, the Company shall
pay to the registered  holders of Right Certificates at the time such Rights are
exercised as herein provided an amount in cash equal to the same fraction of the
current  market value of one Preferred  Share.  For the purposes of this Section
14(b),  the current market value of a Preferred Share shall be the closing price
of a Preferred  Share (as determined  pursuant to the second sentence of Section
11(d)  hereof)  for  the  Trading  Day  immediately  prior  to the  date of such
exercise.

(c) The holder of a Right by the  acceptance of the Right  expressly  waives his
right to receive any fractional Rights or any fractional shares upon exercise of
a Right (except as provided above).

Section 15. Rights of Action.
- -----------------------------

All  rights of action in  respect  of this  Agreement,  excepting  the rights of
action  given to the Rights  Agent  under  Section 18 hereof,  are vested in the
respective  registered  holders  of the Right  Certificates  (and,  prior to the
Distribution  Date,  the  registered  holders  of the  Common  Shares);  and any
registered holder of any Right Certificate (or, prior to the Distribution  Date,
of the Common Shares),  without the consent of the Rights Agent or of the holder
of any other Right  Certificate  (or,  prior to the  Distribution  Date,  of the
Common Shares), may, in his own behalf and for his own benefit, enforce, and may
institute  and maintain any suit,  action or  proceeding  against the Company to
enforce,  or  otherwise  act in  respect  of, his right to  exercise  the Rights
evidenced  by such  Right  Certificate  in the  manner  provided  in such  Right
Certificate  and in  this  Agreement.  Without  limiting  the  foregoing  or any
remedies  available to the holders of Rights,  it is  specifically  acknowledged
that the  holders  of Rights  would not have an  adequate  remedy at law for any
breach of this  Agreement  and will be entitled to specific  performance  of the
obligations under, and injunctive relief against actual or threatened violations
of the  obligations  of any Person  subject  to,  this  Agreement.

Section  16. Agreement  of Right  Holders.
- ------------------------------------------

Every  holder of a Right,  by accepting  the same,  consents and agrees with the
Company and the Rights  Agent and with every other  holder of a Right that:

(a) prior to the  Distribution  Date,  the Rights will be  transferable  only in
connection with the transfer of the Common Shares;

(b) after the Distribution Date, the Right Certificates are transferable only on
the registry books of the Rights Agent if surrendered at the principal office of
the Rights Agent in Chicago,  Illinois, duly endorsed or accompanied by a proper
instrument of transfer; and

(c) the Company and the Rights Agent may deem and treat the person in whose name
the Right Certificate (or, prior to the Distribution Date, the associated Common
Shares  certificate)  is  registered  as the absolute  owner  thereof and of the
Rights evidenced thereby  (notwithstanding any notations of ownership or writing
on the Right  Certificates or the associated  Common Shares  certificate made by
anyone other than the Company or the Rights Agent) for all purposes  whatsoever,
and neither the Company nor the Rights  Agent shall be affected by any notice to
the contrary.

Section 17. Right Certificate Holder Not Deemed a Stockholder.
- --------------------------------------------------------------

No holder, as such, of any Right Certificate shall be entitled to vote,  receive
dividends or be deemed for any purpose the holder of the Preferred Shares or any
other  securities  of the  Company  which  may at any  time be  issuable  on the
exercise of the Rights represented  thereby, nor shall anything contained herein
or in any Right  Certificate be construed to confer upon the holder of any Right
Certificate,  as such,  any of the rights of a stockholder of the Company or any
right to vote for the  election of  directors  or upon any matter  submitted  to
stockholders  at any  meeting  thereof,  or to give or  withhold  consent to any
corporate  action,  or to receive notice of meetings or other actions  affecting
stockholders  (except as provided in Section 25 hereof), or to receive dividends
or subscription  rights,  or otherwise,  until the Right or Rights  evidenced by
such  Right  Certificate  shall  have  been  exercised  in  accordance  with the
provisions hereof.

Section 18. Concerning the Rights Agent.
- ----------------------------------------

The Company agrees to pay to the Rights Agent  reasonable  compensation  for all
services  rendered  by it  hereunder  and,  from time to time,  on demand of the
Rights Agent, its reasonable  expenses and counsel fees and other  disbursements
incurred in the  administration and execution of this Agreement and the exercise
and  performance of its duties  hereunder.  The Company also agrees to indemnify
the Rights Agent for, and to hold it harmless against, any loss,  liability,  or
expense,  incurred without  negligence,  bad faith or willful  misconduct on the
part of the Rights  Agent,  for anything  done or omitted by the Rights Agent in
connection with the acceptance and  administration of this Agreement,  including
the costs and  expenses  of  defending  against  any claim of  liability  in the
premises.  The indemnity provided for herein shall survive the expiration of the
Rights, the termination of this Agreement, and the resignation or removal of the
Rights Agent.  The costs and expenses of enforcing the right of  indemnification
shall also be paid by the Company.

The Rights Agent may  conclusively  rely upon and shall be  protected  and shall
incur no liability  for, or in respect of any action taken,  suffered or omitted
by it in connection with, its  administration of this Agreement in reliance upon
any Right  Certificate or certificate for the Preferred  Shares or Common Shares
or for other  securities  of the Company,  instrument of assignment or transfer,
power of attorney,  endorsement,  affidavit, letter, notice, direction, consent,
certificate,  statement, or other paper or document believed by it to be genuine
and to be signed,  executed and, where necessary,  verified or acknowledged,  by
the proper  person or persons,  or  otherwise  upon the advice of counsel as set
forth in Section 20 hereof.

Notwithstanding  anything in this  Agreement to the contrary,  in no event shall
the Rights Agent be liable for special, indirect or consequential loss or damage
of any kind whatsoever (including but not limited to lost profits),  even if the
Rights  Agent has been  advised  of the  likelihood  of such loss or damage  and
regardless of the form of the action. 

Section 19. Merger or  Consolidation or Change of Name of Rights Agent.
- -----------------------------------------------------------------------

Any corporation into which the Rights Agent or any successor Rights Agent may be
merged or with which it may be consolidated,  or any corporation  resulting from
any merger or  consolidation  to which the Rights Agent or any successor  Rights
Agent shall be a party, or any  corporation  succeeding to the stock transfer or
corporate trust powers of the Rights Agent or any successor Rights Agent,  shall
be the successor to the Rights Agent under this Agreement  without the execution
or  filing  of any paper or any  further  act on the part of any of the  parties
hereto,  provided that such  corporation  would be eligible for appointment as a
successor Rights Agent under the provisions of Section 21 hereof. In case at the
time such  successor  Rights Agent shall  succeed to the agency  created by this
Agreement,  any of the Right  Certificates shall have been countersigned but not
delivered, any such successor Rights Agent may adopt the countersignature of the
predecessor  Rights Agent and deliver such Right  Certificates so countersigned;
and in case at that  time any of the  Right  Certificates  shall  not have  been
countersigned,   any  successor   Rights  Agent  may   countersign   such  Right
Certificates  either in the name of the predecessor  Rights Agent or in the name
of the  successor  Rights Agent;  and in all such cases such Right  Certificates
shall  have  the full  force  provided  in the  Right  Certificates  and in this
Agreement. In case at any time the name of the Rights Agent shall be changed and
at such time any of the Right Certificates shall have been countersigned but not
delivered,  the Rights Agent may adopt the countersignature under its prior name
and deliver Right Certificates so countersigned; and in case at that time any of
the Right Certificates shall not have been  countersigned,  the Rights Agent may
countersign such Right  Certificates  either in its prior name or in its changed
name;  and in all such cases such Right  Certificates  shall have the full force
provided in the Right Certificates and in this Agreement.

Section 20. Duties of Rights  Agent.
- ------------------------------------

The Rights Agent undertakes the duties and obligations imposed by this Agreement
upon the following  terms and  conditions,  and no implied duties or obligations
shall be read into this Agreement  against the Rights Agent, by all of which the
Company  and the holders of Right  Certificates,  by their  acceptance  thereof,
shall be bound:

(a) Before the Rights Agent acts or refrains  from acting,  the Rights Agent may
consult with legal counsel (who may be legal  counsel for the Company),  and the
opinion of such counsel shall be full and complete  authorization and protection
to the Rights Agent as to any action taken or omitted by it in good faith and in
accordance with such opinion.

(b) Whenever in the  performance  of its duties under this  Agreement the Rights
Agent shall deem it necessary or desirable  that any fact or matter be proved or
established  by the Company prior to taking or suffering  any action  hereunder,
such  fact or  matter  (unless  other  evidence  in  respect  thereof  be herein
specifically prescribed) may be deemed to be conclusively proved and established
by a certificate  signed by any one of the Chairman of the Board, the President,
any Vice President,  the Treasurer or the Secretary of the Company and delivered
to the Rights Agent;  and such  certificate  shall be full  authorization to the
Rights  Agent for any  action  taken or  suffered  in good faith by it under the
provisions of this Agreement in reliance upon such certificate.

(c) The Rights  Agent  shall be liable  hereunder  to the  Company and any other
Person only for its own negligence, bad faith or willful misconduct.

(d)  The  Rights  Agent  shall  not be  liable  for or by  reason  of any of the
statements  of fact or  recitals  contained  in this  Agreement  or in the Right
Certificates (except its countersignature  thereof) or be required to verify the
same, but all such  statements and recitals are and shall be deemed to have been
made by the Company only.

(e) The Rights  Agent  shall not be under any  responsibility  in respect of the
validity of this Agreement or the execution and delivery  hereof (except the due
execution hereof by the Rights Agent) or in respect of the validity or execution
of any Right Certificate (except its countersignature  thereof); nor shall it be
responsible for any breach by the Company of any covenant or condition contained
in this Agreement or in any Right  Certificate;  nor shall it be responsible for
any change in the  exercisability  of the Rights  (including the Rights becoming
void pursuant to Section 11(a)(ii) hereof) or any adjustment in the terms of the
Rights (including the manner,  method or amount thereof) provided for in Section
3, 11, 13, 23 or 24, or the  ascertaining  of the  existence of facts that would
require any such change or  adjustment  (except  with respect to the exercise of
Rights evidenced by Right  Certificates  after actual notice that such change or
adjustment is required); nor shall it by any act hereunder be deemed to make any
representation  or  warranty  as to  the  authorization  or  reservation  of any
Preferred  Shares  to  be  issued  pursuant  to  this  Agreement  or  any  Right
Certificate or as to whether any Preferred Shares will, when issued,  be validly
authorized and issued, fully paid and nonassessable.
         
(f) The Company agrees that it will perform, execute, acknowledge and deliver or
cause to be performed, executed, acknowledged and delivered all such further and
other acts,  instruments  and  assurances  as may  reasonably be required by the
Rights  Agent for the  carrying  out or  performing  by the Rights  Agent of the
provisions of this Agreement.

(g) The Rights Agent is hereby  authorized  and directed to accept  instructions
with  respect to the  performance  of its duties  hereunder  from any one of the
Chairman of the Board, the President,  any Vice President,  the Secretary or the
Treasurer  of the  Company,  and  to  apply  to  such  officers  for  advice  or
instructions in connection  with its duties,  and it shall not be liable for any
action taken or suffered by it in good faith in accordance with  instructions of
any  such  officer  or  for  any  delay  in  acting  while   waiting  for  those
instructions.  Any application by the Rights Agent for written instructions from
the  Company  may, at the option of the Rights  Agent,  set forth in writing any
action  proposed  to be taken or omitted by the Rights  Agent  under this Rights
Agreement  and the date on or after  which  such  action  shall be taken or such
omission shall be effective. The Rights Agent shall not be liable for any action
taken by, or  omission  of,  the  Rights  Agent in  accordance  with a  proposal
included  in any  such  application  on or  after  the  date  specified  in such
application  (which date shall not be less than ten Business Days after the date
any officer of the Company actually receives such  application,  unless any such
officer shall have  consented in writing to an earlier  date)  unless,  prior to
taking any such action (or the effective  date in the case of an omission),  the
Rights  Agent  shall have  received  written  instructions  in  response to such
application  subject to the proposed  action or omission  and/or  specifying the
action to be taken or omitted. 

(h) The Rights Agent and any stockholder,  director,  officer or employee of the
Rights Agent may buy,  sell or deal in any of the Rights or other  securities of
the Company or become  pecuniarily  interested in any  transaction  in which the
Company  may be  interested,  or  contract  with or lend money to the Company or
otherwise  act as fully and freely as though it were not Rights Agent under this
Agreement.  Nothing  herein  shall  preclude the Rights Agent from acting in any
other capacity for the Company or for any other legal entity.

(i) The Rights Agent may execute and exercise any of the rights or powers hereby
vested in it or perform any duty  hereunder  either  itself or by or through its
attorneys or agents, and the Rights Agent shall not be answerable or accountable
for any act,  default,  neglect or misconduct of any such attorneys or agents or
for any loss to the Company  resulting  from any such act,  default,  neglect or
misconduct,  provided  reasonable  care  was  exercised  in  the  selection  and
continued employment thereof.

(j) No provision of this  Agreement  shall require the Rights Agent to expend or
risk its own funds or otherwise incur any financial liability in the performance
of any of its duties  hereunder  or in the exercise of its rights if there shall
be  reasonable  grounds for believing  that  repayment of such funds or adequate
indemnification against such risk or liability is not reasonably assured to it.

(k) The Rights  Agent  shall not be required to take notice or be deemed to have
notice of any fact, event or determination (including,  without limitation,  any
dates or events defined in this Agreement or the designation of any Person as an
Acquiring Person,  Affiliate or Associate) under this Agreement unless and until
the Rights  Agent  shall be  specifically  notified in writing by the Company of
such fact, event or determination.

Section 21. Change of Rights Agent.
- -----------------------------------

The Rights Agent or any successor Rights Agent may resign and be discharged from
its duties under this  Agreement  upon 30 days' notice in writing  mailed to the
Company and to each transfer  agent of the Common Shares or Preferred  Shares by
registered or certified  mail, and to the holders of the Right  Certificates  by
first-class  mail.  The  Company  may remove the Rights  Agent or any  successor
Rights  Agent upon 30 days'  notice in  writing,  mailed to the Rights  Agent or
successor  Rights Agent,  as the case may be, and to each transfer  agent of the
Common Shares or Preferred  Shares by registered or certified  mail,  and to the
holders of the Right Certificates by first-class mail. If the Rights Agent shall
resign or be removed or shall otherwise become incapable of acting,  the Company
shall appoint a successor to the Rights Agent. If the Company shall fail to make
such appointment  within a period of 30 days after giving notice of such removal
or after it has been  notified in writing of such  resignation  or incapacity by
the  resigning  or  incapacitated  Rights  Agent  or by the  holder  of a  Right
Certificate  (who shall,  with such  notice,  submit his Right  Certificate  for
inspection by the Company),  then the registered holder of any Right Certificate
may apply to any court of competent  jurisdiction  for the  appointment of a new
Rights Agent. Any successor Rights Agent, whether appointed by the Company or by
such a court, shall be a corporation organized and doing business under the laws
of the United  States or of the State of Illinois  (or of any other state of the
United  States so long as such  corporation  is  authorized  to do business as a
banking  institution  in the State of  Illinois),  in good  standing,  having an
office in the State of Illinois, which is authorized under such laws to exercise
corporate  trust or stock  transfer  powers  and is subject  to  supervision  or
examination  by  federal  or state  authority  and  which has at the time of its
appointment  as Rights  Agent a  combined  capital  and  surplus of at least $50
million. After appointment,  the successor Rights Agent shall be vested with the
same powers,  rights,  duties and  responsibilities as if it had been originally
named as Rights Agent without  further act or deed; but the  predecessor  Rights
Agent shall deliver and transfer to the  successor  Rights Agent any property at
the time held by it  hereunder,  and execute and deliver any further  assurance,
conveyance,  act or deed necessary for the purpose. Not later than the effective
date of any such  appointment  the Company shall file notice  thereof in writing
with the  predecessor  Rights Agent and each transfer agent of the Common Shares
or  Preferred  Shares,  and mail a notice  thereof in writing to the  registered
holders of the Right  Certificates.  Failure to give any notice  provided for in
this Section 21, however,  or any defect therein,  shall not affect the legality
or validity of the resignation or removal of the Rights Agent or the appointment
of the successor Rights Agent, as the case may be.

Section 22. Issuance of New Right Certificates.
- -----------------------------------------------

Notwithstanding  any of the provisions of this Agreement or of the Rights to the
contrary,  the  Company  may,  at  its  option,  issue  new  Right  Certificates
evidencing  Rights in such form as may be approved by its Board of  Directors to
reflect any adjustment or change in the Purchase Price and the number or kind or
class of shares or other  securities  or  property  purchasable  under the Right
Certificates made in accordance with the provisions of this Agreement.

Section 23. Redemption.
- -----------------------

(a) The Board of Directors of the Company may, at its option,  at any time prior
to such time as any Person becomes an Acquiring Person,  redeem all but not less
than all the then  outstanding  Rights at a redemption  price of $.01 per Right,
appropriately  adjusted to reflect any stock  split,  stock  dividend or similar
transaction  occurring  after  the date  hereof  (such  redemption  price  being
hereinafter referred to as the "Redemption Price"). The redemption of the Rights
by the Board of Directors may be made  effective at such time, on such basis and
with  such  conditions  as the Board of  Directors  in its sole  discretion  may
establish.

(b)  Immediately  upon the  action  of the  Board of  Directors  of the  Company
ordering the redemption of the Rights  pursuant to paragraph (a) of this Section
23, and without any further action and without any notice, the right to exercise
the Rights will terminate and the only right thereafter of the holders of Rights
shall be to receive the Redemption Price. The Company shall promptly give public
notice of any such redemption;  provided,  however, that the failure to give, or
any defect in, any such notice shall not affect the validity of such redemption.
Within  10 days  after  such  action  of the  Board of  Directors  ordering  the
redemption  of the Rights,  the Company shall mail a notice of redemption to all
the  holders  of the then  outstanding  Rights at their last  addresses  as they
appear upon the registry books of the Rights Agent or, prior to the Distribution
Date, on the registry  books of the transfer  agent for the Common  Shares.  Any
notice  which is mailed in the manner  herein  provided  shall be deemed  given,
whether or not the holder  receives the notice.  Each such notice of  redemption
will state the method by which the payment of the Redemption Price will be made.
Neither the Company nor any of its Affiliates or Associates may redeem,  acquire
or  purchase  for value any  Rights at any time in any  manner  other  than that
specifically  set forth in this  Section 23 or in  Section 24 hereof,  and other
than in connection with the purchase of Common Shares prior to the  Distribution
Date.

Section 24. Exchange.
- ---------------------

(a) The Board of Directors of the Company may, at its option,  at any time after
any  Person  becomes  an  Acquiring  Person,  exchange  all or part of the  then
outstanding  and  exercisable  Rights (which shall not include  Rights that have
become void pursuant to the provisions of Section  11(a)(ii)  hereof) for Common
Shares  at an  exchange  ratio of one  Common  Share  per  Right,  appropriately
adjusted  to reflect any stock  split,  stock  dividend  or similar  transaction
occurring after the date hereof (such exchange ratio being hereinafter  referred
to as the  "Exchange  Ratio").  Notwithstanding  the  foregoing,  the  Board  of
Directors  shall not be empowered to effect such  exchange at any time after any
Person  (other than the Company,  any  Subsidiary  of the Company,  any employee
benefit plan of the Company or any such Subsidiary, or any entity holding Common
Shares  for or  pursuant  to the  terms of any  such  plan),  together  with all
Affiliates and Associates of such Person, becomes the Beneficial Owner of 50% or
more of the Common Shares then outstanding.
         
(b)  Immediately  upon the  action  of the  Board of  Directors  of the  Company
ordering the exchange of any Rights pursuant to paragraph (a) of this Section 24
and  without any  further  action and without any notice,  the right to exercise
such Rights shall  terminate  and the only right  thereafter of a holder of such
Rights shall be to receive  that number of Common  Shares equal to the number of
such Rights held by such holder  multiplied by the Exchange  Ratio.  The Company
shall promptly give public notice of any such exchange;  provided, however, that
the failure to give, or any defect in, such notice shall not affect the validity
of such exchange.  The Company promptly shall mail a notice of any such exchange
to all of the holders of such Rights at their last addresses as they appear upon
the registry books of the Rights Agent. Any notice which is mailed in the manner
herein  provided shall be deemed given,  whether or not the holder  receives the
notice. Each such notice of exchange will state the method by which the exchange
of the Common  Shares  for  Rights  will be  effected  and,  in the event of any
partial  exchange,  the number of Rights  which will be  exchanged.  Any partial
exchange  shall be effected  pro rata based on the number of Rights  (other than
Rights which have become void pursuant to the  provisions  of Section  11(a)(ii)
hereof) held by each holder of Rights.

(c) In the event that there shall not be sufficient Common Shares issued but not
outstanding  or  authorized  but  unissued  to permit any  exchange of Rights as
contemplated in accordance with this Section 24, the Company shall take all such
action as may be necessary to authorize  additional  Common  Shares for issuance
upon exchange of the Rights.  In the event the Company  shall,  after good faith
effort,  be unable to take all such action as may be necessary to authorize such
additional Common Shares,  the Company shall  substitute,  for each Common Share
that would otherwise be issuable upon exchange of a Right, a number of Preferred
Shares or fraction  thereof  such that the current per share market price of one
Preferred  Share  multiplied  by such number or fraction is equal to the current
per share  market  price of one Common  Share as of the date of issuance of such
Preferred Shares or fraction thereof.

(d) The Company shall not be required to issue  fractions of Common Shares or to
distribute certificates which evidence fractional Common Shares. In lieu of such
fractional Common Shares, the Company shall pay to the registered holders of the
Right  Certificates  with regard to which such  fractional  Common  Shares would
otherwise  be  issuable  an amount  in cash  equal to the same  fraction  of the
current market value of a whole Common Share. For the purposes of this paragraph
(d), the current market value of a whole Common Share shall be the closing price
of a Common  Share (as  determined  pursuant  to the second  sentence of Section
11(d)  hereof)  for the Trading  Day  immediately  prior to the date of exchange
pursuant to this Section 24.

Section 25. Notice of Certain Events.
- -------------------------------------

(a) In case the Company  shall  propose to pay any dividend  payable in stock of
any  class  to  the  holders  of its  Preferred  Shares  or to  make  any  other
distribution  to the  holders  of its  Preferred  Shares  (other  than a regular
quarterly cash dividend),  (ii) to offer to the holders of its Preferred  Shares
rights or warrants to  subscribe  for or to purchase  any  additional  Preferred
Shares  or  shares  of stock of any  class or any  other  securities,  rights or
options,  (iii) to effect any  reclassification  of its Preferred  Shares (other
than a reclassification  involving only the subdivision of outstanding Preferred
Shares),  (iv) to effect any  consolidation or merger into or with, or to effect
any sale or other  transfer  (or to permit  one or more of its  Subsidiaries  to
effect any sale or other transfer), in one or more transactions,  of 50% or more
of the assets or earning power of the Company and its  Subsidiaries  (taken as a
whole)  to, any other  Person,  (v) to effect the  liquidation,  dissolution  or
winding up of the Company,  or (vi) to declare or pay any dividend on the Common
Shares  payable  in Common  Shares or to effect a  subdivision,  combination  or
consolidation  of the Common Shares (by  reclassification  or otherwise  than by
payment of dividends in Common  Shares),  then,  in each such case,  the Company
shall give to each holder of a Right Certificate,  in accordance with Section 26
hereof,  a notice of such proposed  action,  which shall specify the record date
for the purposes of such stock dividend,  or distribution of rights or warrants,
or the  date  on  which  such  reclassification,  consolidation,  merger,  sale,
transfer, liquidation,  dissolution, or winding up is to take place and the date
of  participation  therein by the holders of the Common Shares and/or  Preferred
Shares,  if any such date is to be fixed,  and such notice  shall be so given in
the case of any action covered by clause or (ii) above at least 10 days prior to
the record date for determining  holders of the Preferred Shares for purposes of
such action, and in the case of any such other action, at least 10 days prior to
the date of the  taking of such  proposed  action  or the date of  participation
therein by the holders of the Common Shares and/or Preferred  Shares,  whichever
shall be the earlier.

(b) In case the event set forth in Section  11(a)(ii)  hereof shall occur,  then
the Company  shall as soon as  practicable  thereafter  give to each holder of a
Right  Certificate,  in  accordance  with  Section  26  hereof,  a notice of the
occurrence  of such  event,  which  notice  shall  describe  such  event and the
consequences of such event to holders of Rights under Section 11(a)(ii) hereof.

Section 26. Notices.
- --------------------

Notices  or  demands  authorized  by this  Agreement  to be given or made by the
Rights  Agent or by the  holder of any Right  Certificate  to or on the  Company
shall  be  sufficiently  given  or made if sent  by  first-class  mail,  postage
prepaid,  addressed  (until another  address is filed in writing with the Rights
Agent) as follows:

                           USG Corporation
                           125 South Franklin Street
                           Chicago, Illinois   60606-4678
                           Attention:  Corporate Secretary


Subject to the provisions of Section 21 hereof,  any notice or demand authorized
by this  Agreement  to be given or made by the  Company  or by the holder of any
Right  Certificate  to or on the Rights  Agent  shall be sent by  registered  or
certified  mail and shall be deemed  given upon  receipt  and  addressed  (until
another address is filed in writing with the Company) as follows:


                           Harris Trust and Savings Bank
                           311 West Monroe Street
                           P.  O. Box 755
                           Chicago, Illinois   60690
                           Attention: Kenneth W. Penn

Notices  or  demands  authorized  by this  Agreement  to be given or made by the
Company or the  Rights  Agent to the  holder of any Right  Certificate  shall be
sufficiently  given  or  made  if sent by  first-class  mail,  postage  prepaid,
addressed  to such holder at the address of such holder as shown on the registry
books of the Company.

Section 27. Supplements and Amendments.
- ---------------------------------------

The Company may from time to time supplement or amend this Agreement without the
approval of any holders of Right Certificates in order to cure any ambiguity, to
correct or supplement any provision  contained  herein which may be defective or
inconsistent  with any other provisions  herein, or to make any other provisions
with  respect to the Rights which the Company may deem  necessary or  desirable,
any such  supplement  or amendment  to be  evidenced by a writing  signed by the
Company and the Rights Agent;  provided,  however, that from and after such time
as any Person becomes an Acquiring  Person,  this Agreement shall not be amended
in any manner  which  would  adversely  affect the  interests  of the holders of
Rights.  Without  limiting the  foregoing,  the Company may at any time prior to
such time as any Person  becomes an  Acquiring  Person  amend this  Agreement to
lower the  thresholds  set forth in Sections  1(a) and 3(a) to not less than the
greater of the sum of .001% and the largest percentage of the outstanding Common
Shares then known by the Company to be  beneficially  owned by any Person (other
than the Company,  any Subsidiary of the Company,  any employee  benefit plan of
the Company or any  Subsidiary  of the  Company,  or any entity  holding  Common
Shares for or pursuant to the terms of any such plan) and (ii) 10%.

Notwithstanding  anything in this  Agreement to the  contrary,  no supplement or
amendment  that  changes  the rights and duties of the Rights  Agent  under this
Agreement  will be effective  against the Rights Agent  without the execution of
such supplement or amendment by the Rights Agent.

Section 28. Successors.
- -----------------------

All the covenants and  provisions of this Agreement by or for the benefit of the
Company  or the  Rights  Agent  shall  bind and  inure to the  benefit  of their
respective successors and assigns hereunder.

Section 29. Benefits of this Agreement.
- ---------------------------------------

Nothing  in  this  Agreement  shall  be  construed  to  give  to any  person  or
corporation other than the Company,  the Rights Agent and the registered holders
of the Right  Certificates  (and,  prior to the  Distribution  Date,  the Common
Shares) any legal or equitable right, remedy or claim under this Agreement;  but
this Agreement shall be for the sole and exclusive  benefit of the Company,  the
Rights Agent and the registered holders of the Right Certificates (and, prior to
the Distribution Date, the Common Shares).

Section 30. Severability.
- -------------------------

If any term,  provision,  covenant or restriction of this Agreement is held by a
court of  competent  jurisdiction  or other  authority  to be  invalid,  void or
unenforceable,   the   remainder  of  the  terms,   provisions,   covenants  and
restrictions  of this Agreement  shall remain in full force and effect and shall
in no way be affected, impaired or invalidated.

Section 31. Governing Law.
- --------------------------

This Agreement and each Right Certificate issued hereunder shall be deemed to be
a contract  made under the laws of the State of  Delaware  and for all  purposes
shall be governed by and  construed  in  accordance  with the laws of such State
applicable  to contracts to be made and  performed  entirely  within such State,
except as to the rights and  obligations  of the Rights  Agent,  which  shall be
governed by and construed in accordance with the laws of the State of Illinois.

Section 32. Counterparts.
- -------------------------

This  Agreement may be executed in any number of  counterparts  and each of such
counterparts  shall for all purposes be deemed to be an  original,  and all such
counterparts shall together constitute but one and the same instrument.

Section 33. Descriptive Headings.
- ---------------------------------

Descriptive  headings of the several Sections of this Agreement are inserted for
convenience  only and shall not control or affect the meaning or construction of
any of the provisions hereof.


IN WITNESS  WHEREOF,  the parties  hereto have caused this  Agreement to be duly
executed and attested, all as of the day and year first above written.


Attest:                                 USG CORPORATION


By --------------------                 By ---------------------
   Dean H. Goossen,                        William C. Foote,
   Corporate Secretary                     Chairman and Chief Executive Officer


Attest:                                  HARRIS TRUST AND SAVINGS BANK,
                                         as Rights Agent


By --------------------                  By --------------------
   Title:                                   Title:

<PAGE>



                                    Exhibit A


                                      FORM

                                       of

                           CERTIFICATE OF DESIGNATIONS

                                       of

                 JUNIOR PARTICIPATING PREFERRED STOCK, SERIES D

                                       of

                                 USG CORPORATION

                         (Pursuant to Section 151 of the
                        Delaware General Corporation Law)



     USG  Corporation,  a corporation  organized and existing  under the General
Corporation Law of the State of Delaware (hereinafter called the "Corporation"),
hereby  certifies  that the  following  resolution  was  adopted by the Board of
Directors  of the  Corporation  as  required  by  Section  151  of  the  General
Corporation Law at a meeting duly called and held on March 27, 1998:

     RESOLVED, that pursuant to the authority granted to and vested in the Board
of Directors of this Corporation (hereinafter called the "Board of Directors" or
the  "Board")  in  accordance   with  the  provisions  of  the   Certificate  of
Incorporation,  the Board of  Directors  hereby  creates  a series of  Preferred
Stock,  par value $1 per share (the "Preferred  Stock"),  of the Corporation and
hereby  states the  designation  and number of  shares,  and fixes the  relative
rights, preferences, and limitations thereof as follows:


Junior Participating Preferred Stock, Series D:

Section 1. Designation and Amount.

The shares of such series shall be designated as "Junior Participating Preferred
Stock,  Series D" (the  "Series D  Preferred  Stock")  and the  number of shares
constituting the Series D Preferred Stock shall be two million (2,000,000). Such
number of shares may be increased or  decreased  by  resolution  of the Board of
Directors;  provided,  that no  decrease  shall  reduce  the number of shares of
Series D  Preferred  Stock to a number  less  than the  number  of  shares  then
outstanding plus the number of shares reserved for issuance upon the exercise of
outstanding  options,   rights  or  warrants  or  upon  the  conversion  of  any
outstanding  securities  issued by the  Corporation  convertible  into  Series D
Preferred Stock.

Section 2. Dividends and Distributions.

(A)  Subject  to the  rights  of the  holders  of any  shares  of any  series of
Preferred  Stock (or any similar stock) ranking prior and superior to the Series
D Preferred  Stock with respect to dividends,  the holders of shares of Series D
Preferred  Stock, in preference to the holders of Common Stock,  par value $0.10
per share (the  "Common  Stock"),  of the  Corporation,  and of any other junior
stock,  shall be entitled to receive,  when,  as and if declared by the Board of
Directors out of funds legally  available for the purpose,  quarterly  dividends
payable in cash on the first day of March, June,  September and December in each
year (each such date being referred to herein as a "Quarterly  Dividend  Payment
Date"),  commencing on the first Quarterly Dividend Payment Date after the first
issuance of a share or fraction  of a share of Series D Preferred  Stock,  in an
amount per share  (rounded to the nearest  cent) equal to the greater of (a) $25
or (b) subject to the provision for adjustment  hereinafter set forth, 100 times
the  aggregate  per  share  amount  of all cash  dividends,  and 100  times  the
aggregate per share amount (payable in kind) of all non-cash  dividends or other
distributions,  other  than a dividend  payable  in shares of Common  Stock or a
subdivision of the outstanding  shares of Common Stock (by  reclassification  or
otherwise),  declared  on the  Common  Stock  since  the  immediately  preceding
Quarterly Dividend Payment Date or, with respect to the first Quarterly Dividend
Payment  Date,  since the first  issuance of any share or fraction of a share of
Series D Preferred Stock. In the event the Corporation shall at any time declare
or pay any dividend on the Common Stock  payable in shares of Common  Stock,  or
effect a subdivision or combination or consolidation  of the outstanding  shares
of Common Stock (by  reclassification or otherwise than by payment of a dividend
in shares of Common  Stock) into a greater or lesser  number of shares of Common
Stock on or after  April 15,  1998,  then in each such case the  amount to which
holders of shares of Series D Preferred Stock were entitled immediately prior to
such event  under  clause (b) of the  preceding  sentence  shall be  adjusted by
multiplying  such amount by a fraction,  the numerator of which is the number of
shares  of  Common  Stock  outstanding  immediately  after  such  event  and the
denominator  of  which is the  number  of  shares  of  Common  Stock  that  were
outstanding immediately prior to such event.

(B) The  Corporation  shall declare a dividend or  distribution  on the Series D
Preferred Stock as provided in paragraph (A) of this Section  immediately  after
it  declares a  dividend  or  distribution  on the Common  Stock  (other  than a
dividend  payable in shares of Common  Stock);  provided  that,  in the event no
dividend or distribution shall have been declared on the Common Stock during the
period  between any  Quarterly  Dividend  Payment  Date and the next  subsequent
Quarterly  Dividend  Payment  Date,  a dividend of $25 per share on the Series D
Preferred  Stock  shall  nevertheless  be payable on such  subsequent  Quarterly
Dividend Payment Date.

(C) Dividends  shall begin to accrue and be cumulative on outstanding  shares of
Series D Preferred Stock from the Quarterly Dividend Payment Date next preceding
the date of issue of such  shares,  unless  the date of issue of such  shares is
prior to the record date for the first Quarterly Dividend Payment Date, in which
case  dividends  on such shares  shall begin to accrue from the date of issue of
such shares, or unless the date of issue is a Quarterly Dividend Payment Date or
is a date after the record  date for the  determination  of holders of shares of
Series D Preferred  Stock  entitled to receive a quarterly  dividend  and before
such Quarterly  Dividend  Payment Date, in either of which events such dividends
shall begin to accrue and be cumulative  from such  Quarterly  Dividend  Payment
Date.  Accrued but unpaid  dividends shall not bear interest.  Dividends paid on
the shares of Series D Preferred  Stock in an amount less than the total  amount
of such  dividends  at the time  accrued  and  payable on such  shares  shall be
allocated pro rata on a  share-by-share  basis among all such shares at the time
outstanding.  The Board of Directors may fix a record date for the determination
of holders of shares of Series D Preferred  Stock entitled to receive payment of
a dividend or distribution declared thereon, which record date shall be not more
than 60 days prior to the date fixed for the payment thereof.  Section 3. Voting
Rights.  The  holders  of shares  of Series D  Preferred  Stock  shall  have the
following voting rights:

(A) Subject to the provision for adjustment hereinafter set forth, each share of
Series D Preferred  Stock shall  entitle the holder  thereof to 100 votes on all
matters submitted to a vote of the stockholders of the Corporation. In the event
the  Corporation  shall at any time  declare or pay any  dividend  on the Common
Stock payable in shares of Common Stock,  or effect a subdivision or combination
or consolidation of the outstanding shares of Common Stock (by  reclassification
or  otherwise  than by payment of a dividend  in shares of Common  Stock) into a
greater or lesser  number of shares of Common  Stock on or after April 15, 1998,
then in each such case the number of votes per share to which  holders of shares
of Series D Preferred Stock were entitled  immediately prior to such event shall
be adjusted by multiplying such number by a fraction,  the numerator of which is
the number of shares of Common Stock  outstanding  immediately  after such event
and the  denominator  of which is the number of shares of Common Stock that were
outstanding immediately prior to such event.

(B)  Except  as  otherwise   provided  herein,   in  any  other  Certificate  of
Designations  creating a series of Preferred  Stock or any similar stock,  or by
law, the holders of shares of Series D Preferred Stock and the holders of shares
of Common Stock and any other capital stock of the  Corporation  having  general
voting  rights  shall vote  together as one class on all matters  submitted to a
vote of stockholders of the Corporation.

(C) Except as set forth  herein,  or as  otherwise  provided by law,  holders of
Series D Preferred  Stock shall have no special  voting rights and their consent
shall not be  required  (except to the  extent  they are  entitled  to vote with
holders of Common Stock as set forth herein) for taking any corporate action.

Section 4. Certain Restrictions.

(A) Whenever quarterly dividends or other dividends or distributions  payable on
the Series D Preferred Stock as provided in Section 2 are in arrears, thereafter
and until all accrued and unpaid  dividends  and  distributions,  whether or not
declared, on shares of Series D Preferred Stock outstanding shall have been paid
in full, the Corporation shall not:

(i) declare or pay dividends, or make any other distributions,  on any shares of
stock ranking junior (either as to dividends or upon liquidation, dissolution or
winding up) to the Series D Preferred Stock;

(ii) declare or pay dividends, or make any other distributions, on any shares of
stock  ranking  on a  parity  (either  as  to  dividends  or  upon  liquidation,
dissolution or winding up) with the Series D Preferred  Stock,  except dividends
paid ratably on the Series D Preferred  Stock and all such parity stock on which
dividends  are payable or in arrears in proportion to the total amounts to which
the holders of all such shares are then entitled;

(iii) redeem or purchase or otherwise  acquire for  consideration  shares of any
stock ranking junior (either as to dividends or upon liquidation, dissolution or
winding up) to the Series D Preferred  Stock,  provided that the Corporation may
at any time  redeem,  purchase or  otherwise  acquire  shares of any such junior
stock in  exchange  for shares of any stock of the  Corporation  ranking  junior
(either as to dividends or upon  dissolution,  liquidation or winding up) to the
Series D Preferred Stock; or

(iv) redeem or purchase or  otherwise  acquire for  consideration  any shares of
Series D Preferred  Stock,  or any shares of stock  ranking on a parity with the
Series D Preferred  Stock,  except in accordance  with a purchase  offer made in
writing or by  publication  (as  determined  by the Board of  Directors)  to all
holders  of such  shares  upon  such  terms  as the  Board of  Directors,  after
consideration of the respective  annual dividend rates and other relative rights
and  preferences of the respective  Series and classes,  shall determine in good
faith will result in fair and equitable treatment among the respective series or
classes.

(B) The  Corporation  shall not  permit any  subsidiary  of the  Corporation  to
purchase  or  otherwise  acquire  for  consideration  any shares of stock of the
Corporation unless the Corporation could, under paragraph (A) of this Section 4,
purchase or otherwise acquire such shares at such time and in such manner.

Section 5. Reacquired Shares.

Any shares of Series D Preferred  Stock  purchased or otherwise  acquired by the
Corporation  in any manner  whatsoever  shall be retired and  canceled  promptly
after the  acquisition  thereof.  All such shares shall upon their  cancellation
become  authorized but unissued shares of Preferred Stock and may be reissued as
part  of a  new  series  of  Preferred  Stock  subject  to  the  conditions  and
restrictions on issuance set forth herein,  in the Certificate of Incorporation,
or in any other Certificate of Designations creating a series of Preferred Stock
or any similar stock or as otherwise required by law.

Section 6. Liquidation, Dissolution or Winding Up.

Upon  any  liquidation,  dissolution  or  winding  up  of  the  Corporation,  no
distribution  shall be made (1) to the holders of shares of stock ranking junior
(either as to dividends or upon  liquidation,  dissolution or winding up) to the
Series D Preferred Stock unless,  prior thereto, the holders of shares of Series
D Preferred  Stock shall have received  $100 per share,  plus an amount equal to
accrued and unpaid dividends and distributions thereon, whether or not declared,
to the date of such  payment,  provided  that the  holders of shares of Series D
Preferred  Stock  shall be entitled  to receive an  aggregate  amount per share,
subject to the  provision for  adjustment  hereinafter  set forth,  equal to 100
times the aggregate  amount to be distributed  per share to holders of shares of
Common  Stock,  or (2) to the  holders  of shares of stock  ranking  on a parity
(either as to dividends or upon liquidation, dissolution or winding up) with the
Series D Preferred  Stock,  except  distributions  made  ratably on the Series D
Preferred  Stock and all such parity stock in proportion to the total amounts to
which the  holders  of all such  shares  are  entitled  upon  such  liquidation,
dissolution  or  winding  up.  In the event  the  Corporation  shall at any time
declare  or pay any  dividend  on the Common  Stock  payable in shares of Common
Stock,  or  effect  a  subdivision  or  combination  or   consolidation  of  the
outstanding  shares of Common Stock (by  reclassification  or otherwise  than by
payment of a dividend in shares of Common Stock) into a greater or lesser number
of shares of Common Stock on or after April 15, 1998, then in each such case the
aggregate  amount to which  holders of shares of Series D  Preferred  Stock were
entitled  immediately prior to such event under the proviso in clause (1) of the
preceding  sentence shall be adjusted by  multiplying  such amount by a fraction
the  numerator  of which is the  number of shares  of Common  Stock  outstanding
immediately  after  such  event and the  denominator  of which is the  number of
shares of Common Stock that were outstanding immediately prior to such event.

Section 7. Consolidation,  Merger, etc.

In case the Corporation shall enter into any consolidation,  merger, combination
or other  transaction  in which the shares of Common Stock are  exchanged for or
changed into other stock or securities,  cash and/or any other property, then in
any such case each share of Series D  Preferred  Stock shall at the same time be
similarly  exchanged  or  changed  into an  amount  per  share,  subject  to the
provision for adjustment hereinafter set forth, equal to 100 times the aggregate
amount of stock,  securities,  cash and/or any other property (payable in kind),
as the case may be,  into  which or for  which  each  share of  Common  Stock is
changed or exchanged.  In the event the Corporation shall at any time declare or
pay any  dividend  on the Common  Stock  payable in shares of Common  Stock,  or
effect a subdivision or combination or consolidation  of the outstanding  shares
of Common Stock (by  reclassification or otherwise than by payment of a dividend
in shares of Common  Stock) into a greater or lesser  number of shares of Common
Stock,  then in each such case the  amount set forth in the  preceding  sentence
with  respect to the  exchange or change of shares of Series D  Preferred  Stock
shall be adjusted by  multiplying  such amount by a fraction,  the  numerator of
which is the number of shares of Common Stock outstanding immediately after such
event and the  denominator of which is the number of shares of Common Stock that
were outstanding immediately prior to such event.

Section 8.   No Redemption.

The shares of Series D Preferred Stock shall not be redeemable.

Section 9. Rank.

The  Series D  Preferred  Stock  shall  rank,  with  respect  to the  payment of
dividends  and the  distribution  of  assets,  junior to all series of any other
class of the Corporation's Preferred Stock.

Section 10. Amendment.

The Restated Certificate of Incorporation,  as amended, of the Corporation shall
not be amended in any manner which would  materially alter or change the powers,
preferences  or special  rights of the Series D Preferred  Stock so as to affect
them  adversely  without  the  affirmative  vote  of  the  holders  of at  least
two-thirds  of the  outstanding  shares  of  Series D  Preferred  Stock,  voting
together as a single class.

IN WITNESS  WHEREOF,  this  Certificate of Designations is executed on behalf of
the Corporation by its Chairman and Chief Executive  Officer and attested by its
Corporate Secretary this 27th day of March, 1998.

                                      USG Corporation



                                      ------------------------------
                                      William C. Foote,
                                      Chairman and Chief Executive Officer



Attest:

- ----------------------------
Dean H. Goossen,
Corporate Secretary

<PAGE>


                                   Exhibit B


                            Form of Right Certificate

Certificate No. R-                                              Rights


               NOT EXERCISABLE AFTER MARCH 27, 2008, OR EARLIER IF
              REDEMPTION OR EXCHANGE OCCURS. THE RIGHTS ARE SUBJECT
                 TO REDEMPTION AT $.01 PER RIGHT AND TO EXCHANGE
                 ON THE TERMS SET FORTH IN THE RIGHTS AGREEMENT.


                                Right Certificate

                                 USG CORPORATION


         This certifies that , or registered assigns, is the registered owner of
the number of Rights set forth above,  each of which entitles the owner thereof,
subject to the terms,  provisions and conditions of the Rights Agreement,  dated
as of March 28,  1998 (the  "Rights  Agreement"),  between  USG  Corporation,  a
Delaware  corporation  (the  "Company"),  and Harris Trust and Savings Bank (the
"Rights Agent"), to purchase from the Company at any time after the Distribution
Date (as such term is defined in the Rights  Agreement)  and prior to 5:00 P.M.,
Chicago time, on March 27, 2008 at the principal  office of the Rights Agent, or
at the office of its successor as Rights  Agent,  one  one-hundredth  of a fully
paid  non-assessable  share of Series D Junior  Participating  Preferred  Stock,
Series D, par value $1 per share (the "Preferred Shares"),  of the Company, at a
purchase price of $200 per one one-hundredth of a Preferred Share (the "Purchase
Price"), upon presentation and surrender of this Right Certificate with the Form
of Election to Purchase duly  executed.  The number of Rights  evidenced by this
Right Certificate (and the number of one one-hundredths of a Preferred Share
which may be purchased upon exercise  hereof) set forth above,  and the Purchase
Price set forth above,  are the number and Purchase  Price as of March 27, 1998,
based on the Preferred  Shares as  constituted  at such date. As provided in the
Rights Agreement,  the Purchase Price and the number of one  one-hundredths of a
Preferred Share which may be purchased upon the exercise of the Rights evidenced
by this Right  Certificate are subject to  modification  and adjustment upon the
happening of certain events.

This Right Certificate is subject to all of the terms, provisions and conditions
of the Rights  Agreement,  which terms,  provisions  and  conditions  are hereby
incorporated  herein by  reference  and made a part  hereof and to which  Rights
Agreement  reference  is  hereby  made  for a full  description  of the  rights,
limitations  of rights,  obligations,  duties and  immunities  hereunder  of the
Rights Agent, the Company and the holders of the Right  Certificates.  Copies of
the  Rights  Agreement  are on file at the  principal  executive  offices of the
Company and the above-mentioned offices of the Rights Agent.

This Right Certificate, with or without other Right Certificates, upon surrender
at the principal  office of the Rights Agent, may be exchanged for another Right
Certificate  or Right  Certificates  of like  tenor and date  evidencing  Rights
entitling the holder to purchase a like aggregate  number of Preferred Shares as
the Rights evidenced by the Right Certificate or Right Certificates  surrendered
shall have entitled such holder to purchase.  If this Right Certificate shall be
exercised in part, the holder shall be entitled to receive upon surrender hereof
another Right  Certificate or Right  Certificates for the number of whole Rights
not exercised.

Subject to the provisions of the Rights Agreement,  the Rights evidenced by this
Certificate  may be redeemed by the  Company at a  redemption  price of $.01 per
Right or (ii) may be  exchanged  in whole  or in part for  Preferred  Shares  or
shares of the Company's Common Stock, par value $0.10 per share.

No fractional  Preferred Shares will be issued upon the exercise of any Right or
Rights  evidenced  hereby (other than fractions which are integral  multiples of
one  one-hundredth  of a  Preferred  Share,  which may,  at the  election of the
Company,  be  evidenced  by  depositary  receipts),  but in lieu  thereof a cash
payment will be made, as provided in the Rights Agreement.

No  holder  of this  Right  Certificate  shall be  entitled  to vote or  receive
dividends or be deemed for any purpose the holder of the Preferred  Shares or of
any other  securities  of the  Company  which may at any time be issuable on the
exercise hereof,  nor shall anything contained in the Rights Agreement or herein
be construed to confer upon the holder  hereof,  as such, any of the rights of a
stockholder of the Company or any right to vote for the election of directors or
upon any matter submitted to stockholders at any meeting thereof,  or to give or
withhold  consent to any corporate  action,  or to receive notice of meetings or
other  actions  affecting   stockholders  (except  as  provided  in  the  Rights
Agreement), or to receive dividends or subscription rights, or otherwise,  until
the  Right or  Rights  evidenced  by this  Right  Certificate  shall  have  been
exercised as provided in the Rights Agreement.

This Right Certificate shall not be valid or obligatory for any purpose until it
shall have been countersigned by the Rights Agent.



WITNESS the  facsimile  signature of the proper  officers of the Company and its
corporate




Seal.  Dated:_________________


ATTEST:                                           USG Corporation



- ------------------------------                    By ---------------------------




Countersigned:


Harris Trust and Savings Bank



By ___________________________
       Authorized Signature

<PAGE>



                    Form of Reverse Side of Right Certificate

                               FORM OF ASSIGNMENT

                (To be executed by the registered holder if such
               holder desires to transfer the Right Certificate.)


         FOR VALUE RECEIVED _____________________________ hereby sells,

assigns and transfers unto _____________________________________________

                  (Please print name and address of transferee)


________________________________________________________________________________
this Right Certificate, together with all right, title and interest therein, and
does hereby irrevocably  constitute and appoint Attorney, to transfer the within
Right Certificate on the books of the within-named  Company,  with full power of
substitution.


Dated: __________________________ , ____________


_________________________________
Signature


Signature Guaranteed:

Signatures  must be  guaranteed  by an eligible  guarantor  institution  (banks,
stockbrokers, savings and loan associations and credit unions with membership in
an  approved  signature  guarantee  Medallion  program),  pursuant  to SEC  Rule
17AD-15.

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


The  undersigned  hereby  certifies  that the  Rights  evidenced  by this  Right
Certificate are not beneficially owned by an Acquiring Person or an Affiliate or
Associate thereof (as defined in the Rights Agreement).


_______________________________
Signature

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

<PAGE>



              Form of Reverse Side of Right Certificate - continued

                          FORM OF ELECTION TO PURCHASE

                  (To be executed if holder desires to exercise
                  Rights represented by the Right Certificate.)


TO:      USG Corporation


The  undersigned   hereby   irrevocably  elects  to  exercise  _________  Rights
represented by this Right  Certificate to purchase the Preferred Shares issuable
upon the  exercise  of such  Rights  and  requests  that  certificates  for such
Preferred Shares be issued in the name of:

Please insert social security
or other identifying number


________________________________________________________________________________
                         (Please print name and address)


________________________________________________________________________________


If such  number of Rights  shall not be all the Rights  evidenced  by this Right
Certificate,  a new Right  Certificate for the balance  remaining of such Rights
shall be registered in the name of and delivered to:

Please insert social security
or other identifying number


________________________________________________________________________________
                         (Please print name and address)


________________________________________________________________________________


Dated:         /      /
         -----  -----  -----
          (mm)  (dd)    (y)

                                                    ____________________________
                                                    Signature


Signature Guaranteed:

<PAGE>



              Form of Reverse Side of Right Certificate - continued

Signatures  must be  guaranteed  by an eligible  guarantor  institution  (banks,
stockbrokers, savings and loan associations and credit unions with membership in
an  approved  signature  guarantee  Medallion  program),  pursuant  to SEC  Rule
17Ad-15.

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


The  undersigned  hereby  certifies  that the  Rights  evidenced  by this  Right
Certificate are not beneficially owned by an Acquiring Person or an Affiliate or
Associate thereof (as defined in the Rights Agreement).


                                                  ______________________________
                                                  Signature

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




                                     NOTICE

The signature in the Form of Assignment or Form of Election to Purchase,  as the
case may be,  must  conform to the name as  written  upon the face of this Right
Certificate in every particular, without alteration or enlargement or any change
whatsoever.

In the event the  certification set forth above in the Form of Assignment or the
Form of Election to Purchase, as the case may be, is not completed,  the Company
and the Rights Agent will deem the beneficial  owner of the Rights  evidenced by
this Right  Certificate  to be an Acquiring  Person or an Affiliate or Associate
thereof (as defined in the Rights  Agreement) and such Assignment or Election to
Purchase will not be honored.

<PAGE>



                                    Exhibit C


                          SUMMARY OF RIGHTS TO PURCHASE
                                PREFERRED SHARES

On March 27, 1998,  the Board of Directors of USG  Corporation  (the  "Company")
declared a dividend of one preferred  share  purchase right (a "Right") for each
outstanding  share of common  stock,  par value  $0.10  per share  (the  "Common
Shares"), of the Company. The dividend is payable on April 15, 1998 (the "Record
Date"),  to the  stockholders  of record on that date.  Each Right  entitles the
registered  holder to purchase from the Company one  one-hundredth of a share of
Series D Junior Participating  Preferred Stock, Series D, par value $1 per share
(the  "Preferred  Shares"),   of  the  Company  at  a  price  of  $200  per  one
one-hundredth  of  a  Preferred  Share  (the  "Purchase   Price"),   subject  to
adjustment.  The  description  and terms of the Rights are set forth in a Rights
Agreement  (the  "Rights  Agreement")  between the Company and Harris  Trust and
Savings  Bank,  an Illinois  banking  corporation,  as Rights Agent (the "Rights
Agent").

Until the  earlier to occur of 10 days  following a public  announcement  that a
person or group of affiliated or associated persons (an "Acquiring Person") have
acquired beneficial ownership of 15% or more of the outstanding Common Shares or
(ii) 10 business  days (or such later date as may be determined by action of the
Board of  Directors  prior to such  time as any  person  or group of  affiliated
persons  becomes  an  Acquiring   Person)  following  the  commencement  of,  or
announcement  of an  intention  to make,  a tender  offer or exchange  offer the
consummation  of which would result in the  beneficial  ownership by a person or
group of 15% or more of the outstanding Common Shares (the earlier of such dates
being  called the  "Distribution  Date"),  the Rights  will be  evidenced,  with
respect to any of the Common  Share  certificates  outstanding  as of the Record
Date, by such Common Share certificate.

The Rights  Agreement  provides that,  until the  Distribution  Date (or earlier
redemption or expiration of the Rights), the Rights will be transferred with and
only with the Common Shares.  Until the Distribution Date (or earlier redemption
or expiration  of the Rights),  new Common Share  certificates  issued after the
Record Date upon  transfer  or new  issuance  of Common  Shares  will  contain a
notation incorporating the Rights Agreement by reference. Until the Distribution
Date (or earlier  redemption  or  expiration  of the Rights),  the surrender for
transfer of any  certificates  for Common  Shares  outstanding  as of the Record
Date,  even  without  such  notation or a copy of this  Summary of Rights  being
attached  thereto,  will also  constitute the transfer of the Rights  associated
with the Common Shares  represented by such certificate.  As soon as practicable
following the Distribution  Date,  separate  certificates  evidencing the Rights
("Right  Certificates") will be mailed to holders of record of the Common Shares
as of the close of business on the  Distribution  Date and such  separate  Right
Certificates alone will evidence the Rights.

The Rights are not  exercisable  until the  Distribution  Date.  The Rights will
expire on March  27,  2008  (the  "Final  Expiration  Date"),  unless  the Final
Expiration  Date is  extended  or unless  the  Rights are  earlier  redeemed  or
exchanged by the Company, in each case, as described below.

The  Purchase  Price  payable,  and the  number  of  Preferred  Shares  or other
securities  or  property  issuable,  upon  exercise of the Rights are subject to
adjustment  from  time to time  to  prevent  dilution  in the  event  of a stock
dividend on, or a subdivision, combination or reclassification of, the Preferred
Shares, (ii) upon the grant to holders of the Preferred Shares of certain rights
or  warrants  to  subscribe  for or  purchase  Preferred  Shares at a price,  or
securities  convertible into Preferred Shares with a conversion price, less than
the  then-current  market  price  of the  Preferred  Shares  or  (iii)  upon the
distribution to holders of the Preferred  Shares of evidences of indebtedness or
assets  (excluding  regular  periodic  cash  dividends  paid out of  earnings or
retained  earnings or dividends  payable in Preferred Shares) or of subscription
rights or warrants (other than those referred to above).

The  number of  outstanding  Rights and the  number of one  one-hundredths  of a
Preferred  Share  issuable  upon  exercise  of each  Right are also  subject  to
adjustment  in the  event  of a stock  split  of the  Common  Shares  or a stock
dividend  on the  Common  Shares  payable  in  Common  Shares  or  subdivisions,
consolidations or combinations of the Common Shares occurring, in any such case,
prior to the Distribution Date.

Preferred Shares purchasable upon exercise of the Rights will not be redeemable.
Each  Preferred  Share  will be  entitled  to a minimum  preferential  quarterly
dividend payment of $25 per share but will be entitled to an aggregate  dividend
of  100  times  the  dividend  declared  per  Common  Share.  In  the  event  of
liquidation,  the holders of the Preferred  Shares will be entitled to a minimum
preferential  liquidation  payment of $100 per share but will be  entitled to an
aggregate payment of 100 times the payment made per Common Share. Each Preferred
Share will have 100 votes,  voting together with the Common Shares.  Finally, in
the event of any merger,  consolidation  or other  transaction  in which  Common
Shares are exchanged, each Preferred Share will be entitled to receive 100 times
the amount  received per Common  Share.  These rights are protected by customary
anti-dilution provisions.

Because of the nature of the Preferred Shares' dividend,  liquidation and voting
rights,  the  value  of the one  one-hundredth  interest  in a  Preferred  Share
purchasable  upon  exercise of each Right  should  approximate  the value of one
Common Share.

In the  event  that  the  Company  is  acquired  in a merger  or other  business
combination  transaction  or 50% or more of its  consolidated  assets or earning
power are sold after a person or group has become an  Acquiring  Person,  proper
provision will be made so that each holder of a Right will  thereafter  have the
right to receive,  upon the exercise  thereof at the then current exercise price
of the Right,  that number of shares of common  stock of the  acquiring  company
which at the time of such  transaction will have a market value of two times the
exercise price of the Right. In the event that any person or group of affiliated
or associated  persons becomes an Acquiring  Person,  proper  provision shall be
made so that each holder of a Right, other than Rights beneficially owned by the
Acquiring Person (which will thereafter be void), will thereafter have the right
to receive upon  exercise  that number of Common Shares having a market value of
two times the exercise price of the Right.

At any time after any person or group  becomes an Acquiring  Person and prior to
the acquisition by such person or group of 50% or more of the outstanding Common
Shares,  the Board of Directors  of the Company may  exchange the Rights  (other
than Rights owned by such person or group which will have become void), in whole
or in part, at an exchange ratio of one Common Share, or one  one-hundredth of a
Preferred  Share (or of a share of a class or series of the Company's  preferred
stock having equivalent rights, preferences and privileges),  per Right (subject
to adjustment).

With certain  exceptions,  no adjustment in the Purchase  Price will be required
until  cumulative  adjustments  require  an  adjustment  of at  least 1% in such
Purchase  Price.  No  fractional  Preferred  Shares  will be issued  (other than
fractions  which are  integral  multiples  of one  one-hundredth  of a Preferred
Share,  which may, at the  election of the Company,  be evidenced by  depositary
receipts) and in lieu  thereof,  an adjustment in cash will be made based on the
market price of the  Preferred  Shares on the last trading day prior to the date
of exercise.

At any time  prior to the  acquisition  by a person  or group of  affiliated  or
associated  persons of  beneficial  ownership of 15% or more of the  outstanding
Common  Shares,  the Board of  Directors of the Company may redeem the Rights in
whole, but not in part, at a price of $.01 per Right (the  "Redemption  Price").
The  redemption  of the Rights may be made  effective at such time on such basis
with  such  conditions  as the Board of  Directors  in its sole  discretion  may
establish.  Immediately upon any redemption of the Rights, the right to exercise
the Rights will terminate and the only right of the holders of Rights will be to
receive the Redemption Price.

The terms of the Rights may be amended by the Board of  Directors of the Company
without  the consent of the holders of the Rights,  including  an  amendment  to
lower certain thresholds described above to not less than the greater of the sum
of .001% and the largest  percentage of the outstanding Common Shares then known
to the Company to be beneficially  owned by any person or group of affiliated or
associated  persons  and (ii) 10%,  except  that from and after such time as any
person or group of affiliated or associated  persons becomes an Acquiring Person
no such  amendment  may  adversely  affect the  interests  of the holders of the
Rights.

Until a Right is exercised,  the holder thereof, as such, will have no rights as
a stockholder of the Company,  including,  without limitation, the right to vote
or to receive  dividends.  A copy of the Rights Agreement will be filed with the
Securities and Exchange Commission as an Exhibit to a Registration Statement.
        
 A copy of the Rights  Agreement  is  available  free of charge from the
Company.  This summary description of the Rights does not purport to be complete
and is qualified in its entirety by reference to the Rights Agreement,  which is
hereby incorporated herein by reference.







                                                     News Release
                                                     USG Corporation
                                                     For Immediate Release
Corporate Communications
(312) 606-5635
Investor Relations Department
(312) 606-4125
PR #98-04

               USG CORPORATION UPDATES SHARE PURCHASE RIGHTS PLAN

CHICAGO,  March 27,  1998 -- USG  Corporation  (NYSE:  USG) today  approved  the
redemption of its current share purchase rights and adopted a new share purchase
rights  plan  that is  designed  to  continue  the  assurance  of fair and equal
treatment of all  shareholders in the event of any proposed  takeover.  The plan
involves  the  distribution  of one  purchase  right for a new  series of junior
preferred stock for each outstanding share of the company's common stock.

USG will redeem the current  preferred  share purchase  rights  declared under a
10-year rights agreement adopted in May 1993. A redemption  payment of $0.01 per
share of USG  Corporation  common stock will be  distributed  on May 1, 1998, to
holders of record as of April 15,  1998.  According  to William C. Foote,  USG's
chairman and chief  executive  officer,  "The old rights plan is being  replaced
because it no longer  adequately  reflects the prospects and market value of the
company."

"The new rights plan is designed to strengthen previous provisions aimed at fair
and equal treatment for all  shareholders in the event of any proposed  takeover
of your company and to help maximize shareholders' long-term investment in USG,"
continued  Foote. "It guards against partial tender offers,  squeeze-outs,  open
market  accumulations  and other tactics to gain control of the company  without
paying all shareholders an adequate premium value."

Foote added,  "The rights are not being distributed in response to any effort to
acquire the company, and the board is not aware of any such effort. However, if
at any point in the future  another  party became  interested in such an effort,
the plan would  encourage it to negotiate with USG's board of directors prior to
attempting a takeover."

As a response to unwelcome  takeover tactics,  the rights plan allows holders of
rights to purchase  shares in either USG  Corporation  or an acquiring  party at
discounts  from market  value,  or permits USG to exchange  common stock for the
rights. The plan has four basic provisions.

First,  if an acquiror  buys 15 percent or more of USG's stock,  the plan allows
other  shareholders  to buy,  with each  right,  additional  USG  shares at a 50
percent  discount.  Second,  if USG is  acquired  in a merger or other  business
combination  transaction,  rights  holders will be entitled to buy shares of the
acquiring company at a 50 percent  discount.  Third, if an acquiror buys between
15 percent and 50 percent of USG's  outstanding  common  stock,  the company can
exchange  part or all of the rights of other holders for shares of the company's
stock on a one-for-one  basis, or shares of the new junior  preferred stock on a
one-for-one-hundredth  basis. Fourth, before an acquiror buys 15 percent or more
of USG's common stock,  the rights are  redeemable for one cent per right at the
option of the board of directors. This provision permits the board to enter into
an  acquisition  transaction  that is  determined  to be in the best interest of
shareholders.  The Board is authorized to reduce the 15 percent threshold to not
less than 10 percent.

The new rights plan will become  effective on April 15, 1998, and will expire on
March 27, 2008. The rights distribution is not taxable to shareholders.

USG  Corporation  is a Fortune 500  company  with  subsidiaries  that are market
leaders in their key  product  groups:  gypsum  wallboard,  joint  compound  and
related  gypsum  products;   ceiling  tile  and  grid;  and  building   products
distribution.  For more information  about USG  Corporation,  visit the USG home
page at http://www.usg.com.

Linda M. Novak, Manager, Corporate Communications
James R. Bencomo, Director, Investor Relations

                                      * * *


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