MESA OPERATING CO
S-3, 1997-01-27
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1
    As filed with the Securities and Exchange Commission on January 27, 1997
                                                           REGISTRATION NO. 333-
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                             --------------------
                                      
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     Under
                           THE SECURITIES ACT OF 1933
                             --------------------

                                   MESA INC.
                               MESA OPERATING CO.
             (Exact name of registrant as specified in its charter)
<TABLE>
<S>                                                            <C>
                  TEXAS                                                     75-2394500
                DELAWARE                                                    75-2516853
     (State or other jurisdiction of                                     (I.R.S. Employer
     incorporation or organization)                                    Identification No.)

        1400 WILLIAMS SQUARE WEST                                       STEPHEN K. GARDNER
      5205 NORTH O'CONNOR BOULEVARD                                 1400 WILLIAMS SQUARE WEST
           IRVING, TEXAS 75039                                    5205 NORTH O'CONNOR BOULEVARD
             (972) 444-9001                                            IRVING, TEXAS 75039
    (Address, including zip code, and                                     (972) 444-9001
telephone number, including area code, of                      (Name, address, including zip code,
registrant's principal executive offices)                      and telephone number, including area
                                                                   code, of agent for service)
</TABLE>
                                   Copy to:
                               ----------------
                               CARLOS A. FIERRO
                            BAKER & BOTTS, L.L.P.
                               2001 ROSS AVENUE
                             DALLAS, TEXAS 75201
                                (214) 953-6818

         APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:  As
soon as practicable after the effective date of this Registration Statement.

         If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box.  [ ]

         If any of the securities being registered on this Form are to be
offered on a delayed or continuous basis pursuant to Rule 415 under the
Securities Act of 1933, other than securities offered only in connection with
dividend or interest reinvestment plans, check the following box.  [x]

         If this Form is filed to register additional securities for an
offering pursuant to Rule 462(b) under the Securities Act, please check the
following box and list the Securities Act registration statement number of the
earlier effective registration statement for the same offering. [ ]

         If this Form is a post-effective amendment filed pursuant to Rule
462(c) under the Securities Act, check the following box and list the
Securities Act registration statement number of the earlier effective
registration statement for the same offering.  [ ]

         If delivery of the prospectus is expected to be made pursuant to Rule
434, please check the following box.  [ ]

                                REGISTRATION FEE

<TABLE>
<CAPTION>
======================================================================================================================
    TITLE OF EACH CLASS OF       AMOUNT TO BE  Proposed Maximum Offering  PROPOSED MAXIMUM AGGREGATE      AMOUNT OF
  SECURITIES TO BE REGISTERED     REGISTERED       Price Per Unit (1)         OFFERING PRICE (2)      REGISTRATION FEE
- ----------------------------------------------------------------------------------------------------------------------
<S>                              <C>                      <C>                    <C>                      <C>
Debt Securities (3) . . . . .
- ----------------------------------------------------------------------------------------------------------------------
Guarantee (4) . . . . . . . .
- ----------------------------------------------------------------------------------------------------------------------
Common Stock, par value $.01
  per share(5)  . . . . . . .
- ----------------------------------------------------------------------------------------------------------------------
         Total  . . . . . . .    $500,000,000             100%                   $500,000,000             $151,516
======================================================================================================================
</TABLE>
(1)      The proposed maximum initial offering price per unit will be
         determined, from time to time, by the Registrant.

(2)      Estimated solely for the purpose of calculating the registration fee
         pursuant to Rule 457(o).  In no event will the aggregate initial
         offering price of all securities issued from time to time pursuant to
         this Registration Statement exceed $500,000,000.  Any securities
         registered hereunder may be sold separately or as units with other
         securities registered hereunder.

(3)      Subject to Footnote (2), there are being registered hereunder an
         indeterminate principal amount of Debt Securities as may be sold from
         time to time by Mesa Operating Co.  If any such Debt Securities are
         issued at an original issue discount, then the offering price shall be
         in such greater principal amount as shall result in an aggregate
         initial offering price of up to $500,000,000.

(4)      MESA Inc., the parent of Mesa Operating Co., is registering a
         guarantee of the payment of the principal of, premium, if any, and
         interest on the Debt Securities being registered hereby.  Pursuant to
         Rule 457(n), no separate registration fee is required with respect to
         such guarantees.

(5)      Subject to Footnote (2), there are being registered hereunder an
         indeterminate number of shares of Common Stock as may be sold from
         time to time by MESA Inc.

         THE REGISTRANTS HEREBY AMEND THIS REGISTRATION STATEMENT ON SUCH DATE
OR DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANTS
SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933, AS AMENDED, OR UNTIL THE REGISTRATION STATEMENT
SHALL BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID
SECTION 8(A), MAY DETERMINE.

================================================================================
<PAGE>   2
                 SUBJECT TO COMPLETION DATED JANUARY 27, 1997

PROSPECTUS

                                  $500,000,000

                                      MESA
                                DEBT SECURITIES
                                  COMMON STOCK

         Mesa Operating Co. ("MOC") may offer from time to time unsecured debt
securities consisting of notes, debentures or other evidences of indebtedness
(collectively, the "Debt Securities").  The Debt Securities will be guaranteed
on an unsecured basis by MESA Inc. (the "Company" and together with MOC, the
"Issuers"), of which MOC is a wholly owned subsidiary.  The Company may also
offer and sell from time to time shares of Common Stock, par value $0.01 per
share (the "Common Stock"), of the Company.  The aggregate initial offering
price of the Debt Securities and the Common Stock to be offered hereby (the
"Securities") will not exceed $500,000,000 or, if applicable, the equivalent
thereof in any other currency or currency unit.  The Securities may be offered
as separate series in amounts, at prices and on terms to be determined in light
of market conditions at the time of sale and set forth in a Prospectus
Supplement.

         The terms of each series of Debt Securities, including, where
applicable, the specific designation, aggregate principal amount, authorized
denominations, maturity, rate or rates and time or times of payment of any
interest, any terms for optional or mandatory redemption, which may include
redemption at the option of holders upon the occurrence of certain events, or
payment of additional amounts or any sinking fund provisions, any initial
public offering price, the net proceeds to MOC and any other specific terms in
connection with the offering and sale of such series will be set forth in a
Prospectus Supplement.  As used herein, the Debt Securities shall include
securities denominated in United States dollars, or, at the option of MOC if so
specified in an applicable Prospectus Supplement, in any other currency or
currency unit, or in amounts determined by reference to an index.

         The Securities may be sold directly by the Issuers to investors,
through agents designated from time to time or to or through underwriters or
dealers.  See "Plan of Distribution."  If any agents of the Issuers or any
underwriters are involved in the sale of any Securities in respect of which
this Prospectus is being delivered, the names of such agents or underwriters
and any applicable commissions or discounts will be set forth in a Prospectus
Supplement.  The net proceeds to the Issuers from such sale also will be set
forth in a Prospectus Supplement.

         The Common Stock is listed on the New York Stock Exchange under the
Symbol MXP.  Any Common Stock offered will be listed, subject to notice of
issuance, on such exchange.

         SEE "RISK FACTORS" BEGINNING ON PAGE 3 FOR A DISCUSSION OF CERTAIN
FACTORS THAT SHOULD BE CONSIDERED BY PROSPECTIVE INVESTORS IN EVALUATING AN
INVESTMENT IN THE SECURITIES.

     This Prospectus may not be used to consummate sales of Securities unless
accompanied by a Prospectus Supplement.

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

   THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
      AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS
        THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
           COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
               PROSPECTUS.  ANY REPRESENTATION TO THE CONTRARY
                            IS A CRIMINAL OFFENSE.

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

             THE DATE OF THIS PROSPECTUS IS                  1997.
<PAGE>   3
NO DEALERS, SALESPERSON OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATION NOT CONTAINED IN THIS PROSPECTUS OR
THE ACCOMPANYING PROSPECTUS SUPPLEMENT IN CONNECTION WITH THE OFFERING COVERED
BY THIS PROSPECTUS AND THE ACCOMPANYING PROSPECTUS SUPPLEMENT.  IF GIVEN OR
MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING
BEEN AUTHORIZED BY THE ISSUERS.  NEITHER THIS PROSPECTUS NOR THE ACCOMPANYING
PROSPECTUS SUPPLEMENT CONSTITUTES AN OFFER TO SELL, OR A SOLICITATION OF ANY
OFFER TO BUY, ANY OF THE SECURITIES OFFERED HEREBY IN ANY JURISDICTION WHERE,
OR TO ANY PERSON WHOM, IT IS UNLAWFUL TO MAKE SUCH OFFER OR SOLICITATION.
NEITHER THE DELIVERY OF THIS PROSPECTUS OR THE ACCOMPANYING PROSPECTUS
SUPPLEMENT NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE
ANY IMPLICATION THAT THERE HAS NOT BEEN ANY CHANGE IN THE FACTS SET FORTH IN
THIS PROSPECTUS OR THE AFFAIRS OF THE COMPANY SINCE THE DATE HEREOF.

                             AVAILABLE INFORMATION

         The Company is subject to the informational requirements of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in
accordance therewith files reports, proxy statements and other information with
the Securities and Exchange Commission (the "Commission").  Such reports, proxy
statements and other information filed by the Company may be inspected and
copied at the public reference facilities maintained by the Commission, 450
Fifth Street, NW, Judiciary Plaza, Washington, D.C. 20549; and at the following
regional offices of the Commission: 7 World Trade Center, New York, New York
10048 and Northwestern Atrium Center, 500 West Madison Street, Chicago,
Illinois 60661 and through the Commission's Internet site at www.sec.gov.
Copies of such material can also be obtained from the Public Reference Section
of the Commission at 450 Fifth Street, N.W., Judiciary Plaza, Washington, D.C.
20549, at prescribed rates.  The Company's Common Stock and its Series A
Preferred Stock are listed on the New York Stock Exchange and such reports,
proxy statements and other information may be inspected at the offices of the
New York Stock Exchange, 20 Broad Street, New York, New York 10005.

         This Prospectus constitutes a part of a registration statement on Form
S-3 (together with all amendments and exhibits thereto, the "Registration
Statement") filed by the Issuers with the Commission under the Securities Act
with respect to the securities offered hereby.  As permitted by the rules and
regulations of the Commission, this Prospectus omits certain information
contained in the Registration Statement, and reference is made to the
Registration Statement for further information with respect to the Issuers and
the securities offered hereby.  Statements contained herein concerning the
provisions of any contract, agreement or any other document or exhibit to the
Registration Statement or otherwise filed with the Commission are not
necessarily complete; with respect to each such contract, agreement or document
filed as an exhibit to the Registration Statement, reference is made to the
exhibit for a more complete description of the matter involved, and each such
statement shall be deemed qualified in its entirety by such reference.

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

         Incorporated by reference in this Prospectus, and subject in each case
to information contained in this Prospectus, are the following documents filed
by the Company with the Commission pursuant to the Exchange Act: (1) the
Company's Annual Report on Form 10-K for the fiscal year ended December 31,
1995; (2) the Company's Quarterly Reports on Form 10-Q for the quarters ended
March 31, 1996, June 30, 1996 and September 30, 1996; (3) the Company's Current
Reports on Form 8-K filed March 1, 1996, April 29, 1996, June 26, 1996 and
September 30, 1996; (4) the description of the Company's Common Stock contained
in the Company's Registration Statement on Form 8-A (File No. 1-10874), dated
September 27, 1991; and (5) the description of the Company's Series A Preferred
Stock contained in the Company's Registration Statement on Form 8-A (File No.
1-10874), filed May 20, 1996.

         Each document filed by the Company pursuant to Section 13(a), 13(c),
14 or 15(d) of the Exchange Act subsequent to the date of this Prospectus and
prior to the termination of the offering of the Securities shall be deemed to
be incorporated by reference in this Prospectus and to be a part of this
Prospectus from the date of filing of such document.  Any statement contained
in a document incorporated or deemed to be incorporated by reference herein
shall be deemed to be modified or superseded for purposes of this Prospectus to
the extent that a statement contained herein or in any other subsequently filed
document which also is or is deemed to be incorporated by reference herein
modifies or supersedes such statement.  Any such statements as modified or
superseded shall not be deemed, except as so modified or superseded, to
constitute a part of this Prospectus.





                                       2
<PAGE>   4
         The Company will provide without charge to each person, including any
beneficial owner, to whom this Prospectus is delivered, upon the written or
oral request of such person, a copy of any and all of the documents
incorporated by reference herein (other than exhibits to such documents unless
such exhibits are specifically incorporated by reference in such documents).
Such request should be directed to Investor Relations, MESA Inc., 1400 Williams
Square West, 5205 North O'Connor Boulevard, Irving, Texas 75039 (telephone
(972) 444-9001).

                                  THE ISSUERS

         The Company is a holding company and conducts its operations through
its wholly-owned subsidiary, MOC.  The Issuers maintain their principal
executive offices at 1400 Williams Square West, 5205 North O'Connor Boulevard,
Irving, Texas 75039, where their telephone number is (972) 444-9001.  Unless
the context otherwise requires, the term "Mesa" means the Company and its
subsidiaries taken as a whole and includes the Company's predecessors.

         Mesa is one of the largest independent oil and gas companies in the
United States and considers itself one of the most efficient operators of
domestic natural gas properties.

                                  RISK FACTORS

         Prospective Investors should consider carefully the following factors
together with the information and financial data set forth elsewhere in this
Prospectus and any accompanying Prospectus Supplement prior to making an
investment decision.

DISCLOSURE REGARDING FORWARD-LOOKING STATEMENTS

         This Prospectus includes and any Prospectus Supplement may include
"forward-looking statements" within the meaning of Section 27A of the
Securities Act and Section 21E of the Exchange Act.  All statements other than
statements of historical fact included in this Prospectus or in any Prospectus
Supplement, including without limitation those regarding Mesa's financial
position and liquidity, the amount of and its ability to make debt service
payments and payments of dividends, its strategic plans, cost reduction efforts
and other matters, are forward-looking statements.  Although Mesa believes that
the expectations reflected in such forward-looking statements are reasonable,
it can give no assurance that such expectations will prove to be correct.
Important factors that could cause actual results to differ materially from
Mesa's expectations are disclosed in this Prospectus and may be disclosed in
any Prospectus Supplement, including without limitation in conjunction with the
forward-looking statements included in this Prospectus or in any Prospectus
Supplement.  All subsequent written and oral forward-looking statements
attributable to Mesa or persons acting on its behalf are expressly qualified in
their entirety by the Cautionary Statements.

SUBSTANTIAL INDEBTEDNESS

         Mesa had long term indebtedness (including current maturities) of
approximately $839.7 million and stockholders' equity of approximately $249.2
million at September 30, 1996.  Mesa's level of indebtedness will have several
important effects on its future operations, including that (i) a portion of
Mesa's cash flow from operations will be dedicated to the payment of interest
on its indebtedness and will not be available for other purposes, (ii) the
covenants contained in Mesa's bank credit facility (the "Credit Facility") and
in the indentures governing Mesa's 10 5/8% Senior Subordinated Notes due 2006
(the "Senior Subordinated Notes") and Mesa's 11 5/8% Senior Subordinated
Discount Notes due 2006 (the "Discount Notes" and, together with the Senior
Subordinated Notes, the "Notes") require Mesa to meet certain financial tests
and other restrictions, will limit its ability to borrow additional funds, to
grant liens and to dispose of assets and will affect Mesa's flexibility in
planning for and reacting to changes in its business, including possible
acquisition activities, and (iii) Mesa's ability to obtain additional financing
in the future for working capital, capital expenditures, acquisitions, general
corporate purposes or other purposes may be impaired.  At December 31, 1996,
Mesa had outstanding $325 million in Senior Subordinated Notes, $159 million in
Discount Notes and $319 million under the Credit Facility (with $195 million of
additional borrowing capacity, net of letter of credit obligations).

         Mesa's ability to meet its debt service obligations and to reduce its
total indebtedness will be dependent upon Mesa's future performance, which will
be subject to oil and gas prices, Mesa's level of production and to general
economic conditions and financial, business and other factors affecting the
operations of Mesa, many of which are





                                       3
<PAGE>   5
beyond its control.  There can be no assurance that Mesa's future performance
will not be adversely affected by such changes in oil and gas prices and/or
production nor by such economic conditions and/or financial, business and other
factors.

HISTORY OF LOSSES

         Mesa had a net loss of $67.3 million for the nine months ended
September 30, 1996 and had net losses of $79.2 million, $89.2 million, $102.4
million, $83.4 million and $57.6 million for the years ended December 31, 1991,
1992, 1993, 1994 and 1995, respectively.  Mesa was profitable in the first two
fiscal quarters of 1996, with net income of $1.1 million and $4.5 million in
the first and second quarters of 1996, respectively.  In the third quarter of
1996, Mesa had a net loss of $72.9 million, which included an extraordinary
loss totaling approximately $59.4 million related to the early extinguishment
of long-term debt associated with the completion of a recapitalization of its
balance sheet (the "Recapitalization").  During 1997, and assuming no change in
its capitalization, Mesa's annual interest expense is expected to be
approximately $85 million, with approximately $65 million payable in cash,
which amounts are expected to vary in subsequent years based on outstanding
borrowings and interest rates under the Credit Facility and the accretion of
interest on the Discount Notes.  The 8% dividend on the Company's Series A 8%
Cumulative Convertible Preferred Stock (the "Series A Preferred Stock") and the
Company's Series B Cumulative Convertible Preferred Stock (the "Series B
Preferred Stock" and, together with the Series A Preferred Stock, the
"Preferred Stock") will be paid in kind (with additional shares of Preferred
Stock) rather than in cash until at least September 2000.  Mesa may continue to
incur net losses and, to the extent that natural gas prices are low, such
losses may be substantial.  See "--Volatility of Natural Gas and NGL Prices."

CONTROL BY SIGNIFICANT SHAREHOLDER

         DNR-MESA Holdings L.P., a Texas limited partnership ("DNR"), whose
sole general partner is Rainwater Inc., a Texas corporation owned by Richard E.
Rainwater, owned approximately 61.2 million shares of Series B Preferred Stock,
which represented approximately 32.9% of Mesa's fully diluted common shares
(excluding outstanding stock options) as of December 31, 1996.  Additionally,
DNR has special voting rights granted to it as holder of the Series B Preferred
Stock which allows it to elect a majority of the directors on Mesa's board.
Accordingly, DNR's board representatives have significant power and authority
over the management and affairs of Mesa and, consequently, DNR has significant
control over Mesa.

VOLATILITY OF NATURAL GAS AND NGL PRICES

         Revenues generated from Mesa's operations are highly dependent upon
the sales prices of, and demand for, natural gas and natural gas liquids
("NGLs").  Historically, the markets for natural gas and NGLs have been
volatile and are likely to continue to be volatile in the future.  Prices for
natural gas and NGLs are subject to wide fluctuation in response to market
uncertainty, changes in supply and demand and a variety of additional factors,
all of which are beyond the control of Mesa.  These factors include domestic
and foreign political conditions, the overall level of supply of and demand for
oil, natural gas and NGLs, the price of imports of oil and natural gas, weather
conditions, the price and availability of alternative fuels and overall
economic conditions.  Mesa's future financial condition and results of
operations will be dependent, in part, upon the prices received for Mesa's
natural gas and NGL production, as well as the costs of acquiring, finding,
developing and producing reserves.

         As of December 31, 1995, approximately 65% of Mesa's proved reserves,
calculated on an energy-equivalent basis, were natural gas and substantially
all of its other reserves were NGLs.  Substantially all of Mesa's sales of
natural gas and NGLs are made in the spot market, or pursuant to contracts
based on spot market prices, and not pursuant to long term, fixed price
contracts.  Any significant decline in prices for natural gas and NGLs could
have a material adverse effect on Mesa's financial condition, results of
operations and quantities of reserves recoverable on an economic basis.  Should
the industry experience significant price declines from current levels or other
adverse market conditions, Mesa may not be able to generate sufficient cash
flows from operations to meet its obligations and make planned capital
expenditures.





                                       4
<PAGE>   6
         The availability of a ready market for Mesa's natural gas and NGL
production also depends on a number of factors, including the demand for and
supply of natural gas and NGLs and the proximity of reserves to, and the
capacity of, oil and gas gathering systems, pipelines or trucking and terminal
facilities.

USE AND RISKS OF HEDGING TRANSACTIONS AND SPECULATIVE INVESTMENTS

         In order to manage its exposure to price risks in the marketing of its
oil and natural gas, Mesa has in the past and may in the future enter into oil
and natural gas futures contracts on the New York Mercantile Exchange
("NYMEX"), fixed price delivery contracts and financial swaps as hedging
devices.  While intended to reduce the effects of volatility of the price of
oil and natural gas, such transactions may limit potential gains by Mesa if oil
and natural gas prices were to rise substantially over the price established by
the hedge.  In addition, such transactions may expose Mesa to the risk of
financial loss in certain circumstances, including instances in which (i)
production is less than expected, (ii) there is a widening of price
differentials between delivery points for Mesa's production and Henry Hub (in
the case of NYMEX futures contracts) or delivery points required by fixed price
delivery contracts to the extent they differ from those of Mesa's production or
to the extent Mesa has not otherwise fixed such price differential, (iii)
Mesa's customers or the counter parties to its futures contracts fail to
purchase or deliver the contracted quantities of oil or natural gas or (iv) a
sudden, unexpected event materially impacts oil or natural gas prices.  Mesa
also invests from time to time in oil and gas or other futures contracts which
are not intended to be hedges of its oil and gas production.  However, such
speculative investments in energy futures contracts, which in prior periods
have been profitable, are expected to be limited in the future.

RESERVES AND FUTURE NET CASH FLOWS

         Information relating to Mesa's proved oil and gas reserves is based
upon engineering estimates.  Reserve engineering is a subjective process of
estimating the recovery from underground accumulations of oil and natural gas
that cannot be measured in an exact manner, and the accuracy of any reserve
estimate is a function of the quality of available data and of engineering and
geological interpretation and judgment.  Estimates of economically recoverable
oil and gas reserves and of future net cash flows necessarily depend upon a
number of variable factors and assumptions, such as historical production from
the area compared with production from other producing areas, the assumed
effects of regulations by governmental agencies and assumptions concerning
future oil and gas prices, future operating costs, severance and excise taxes,
development costs and workover and remedial costs, all of which may in fact
vary considerably from actual results.  Because all reserve estimates are to
some degree speculative, the quantities of oil and natural gas that are
ultimately recovered, production and operation costs, the amount and timing of
future development expenditures and future oil and natural gas sales prices may
all vary from those assumed in these estimates and such variances may be
material.  In addition, different reserve engineers may make different
estimates of reserve quantities and cash flows based upon the same available
data.

         The present values of estimated future net cash flows should not be
construed as the current market value of the estimated proved oil and gas
reserves attributable to Mesa's properties.  In accordance with applicable
requirements of the Commission, the estimated discounted future net cash flows
from proved reserves are generally based on prices and costs as of the date of
the estimate, whereas actual future prices and costs may be materially higher
or lower.  Actual future net cash flows also will be affected by factors such
as the amount and timing of actual production, supply and demand for oil and
gas, curtailments or increases in consumption by gas purchasers and changes in
governmental regulations or taxation.  Mesa's producing properties in the
Hugoton field and the West Panhandle field are subject to production
limitations imposed by state regulatory authorities, by contracts or both, and
any future limitation on production would affect the expected decline in
reserves.  The timing of actual future net cash flows from proved reserves, and
thus their actual present value, will be affected by the timing of both the
production and the incurrence of expenses in connection with development and
production of oil and gas properties.  In addition, the 10% discount factor,
which is required by the Commission to be used to calculate discounted future
net cash flows for reporting purposes, is not necessarily the most appropriate
discount factor based on interest rates in effect from time to time and risks
associated with Mesa's business or the oil and gas industry in general.

         Estimates of Mesa's oil and gas reserves include revisions of certain
reserve estimates attributable to proved properties included in the preceding
year's estimates.  Such revisions reflect additional information from
subsequent activities, production history of the properties involved and any
adjustments in the projected economic life of such





                                       5
<PAGE>   7
properties resulting from changes in product prices.  In addition, the upward
revisions at year end 1994 reflect a change by Mesa to the use of reserve
estimates prepared by Mesa's internal reserve engineers instead of estimates
prepared by an independent petroleum engineering firm.  Any downward revisions
in the future could adversely affect Mesa's financial condition, borrowing base
under the Credit Facility, future prospects and the market value of its
securities.

REPLACEMENT OF RESERVES

         Mesa's future performance depends in part upon its ability to acquire,
find and develop additional oil and gas reserves that are economically
recoverable.  Without successful acquisition, development or exploration
activities, Mesa's reserves will decline.  No assurances can be given that Mesa
will be able to acquire or find and develop additional reserves on an economic
basis.

         Mesa's business is capital intensive and, to maintain its asset base
of proved oil and gas reserves, a significant amount of cash flow from
operations must be reinvested in property acquisitions, development or
exploration activities.  To the extent cash flow from operations is reduced and
external sources of capital become limited or unavailable, Mesa's ability to
make the necessary capital investments to maintain or expand its asset base
would be impaired.  Without such investment, Mesa's oil and gas reserves would
decline.

         In recent years, the majority of Mesa's capital expenditures have been
dedicated to developing and upgrading its existing long lived reserve base
through infill drilling of its Hugoton reserves, additions to its compression
and gathering system and pipeline interconnects, and the construction and
expansion of gas processing plants.  Relatively modest expenditures have been
made to explore for, develop or acquire new reserve additions.  In order to
increase reserves and production, Mesa must continue its development and
exploration drilling program or undertake other replacement activities.  Mesa's
strategy includes increasing its reserve base through acquisitions and
exploitation of producing properties and continued exploitation of its existing
properties.  The successful acquisition of producing properties requires an
assessment of recoverable reserves, future oil and gas prices and operating
costs, potential environmental and other liabilities and other factors.  Such
assessments are necessarily inexact and their accuracy inherently uncertain.
There can be no assurance that Mesa's acquisition activities and exploration
and development projects will result in increases in reserves.  Mesa's
operations may be curtailed, delayed or canceled as a result of lack of
adequate capital and other factors, such as title problems, weather, compliance
with governmental regulations or price controls, mechanical difficulties or
shortages or delays in the delivery of equipment.  Furthermore, while Mesa's
revenues may increase if prevailing gas and oil prices increase significantly,
Mesa's finding costs for additional reserves could also increase.  In addition,
the costs of exploration and development may materially exceed initial
estimates.

OPERATING HAZARDS; LIMITED INSURANCE COVERAGE

         Mesa's operations are subject to hazards and risks inherent in
drilling for and production and transportation of natural gas and oil, such as
fires, natural disasters, explosions, encountering formations with abnormal
pressures, blowouts, cratering, pipeline ruptures and spills, any of which can
result in loss of hydrocarbons, environmental pollution, personal injury claims
and other damage to properties of Mesa and others.  These risks could result in
substantial losses to Mesa due to injury and loss of life, severe damage to and
destruction of property and equipment, pollution and other environmental damage
and suspension of operations.  Moreover, Mesa's Gulf of Mexico offshore
operations are subject to a variety of operating risks peculiar to the marine
environment, such as hurricanes or other adverse weather conditions, to more
extensive governmental regulation, including regulations that may, in certain
circumstances, impose strict liability for pollution damage, and to
interruption or termination of operations by governmental authorities based on
environmental or other considerations.

         As protection against operating hazards, Mesa maintains insurance
coverage against some, but not all, potential losses.  Mesa's coverages
include, but are not limited to, operator's extra expense, physical damage on
certain assets, employer's liability, comprehensive general liability,
automobile, workers' compensation and loss of production income insurance and
limited coverage for sudden environmental damages, but Mesa does not believe
that insurance coverage for environmental damages that occur over time is
available at a reasonable cost.  Moreover, Mesa does not believe that insurance
coverage for the full potential liability that could be caused by sudden
environmental damages is available at a reasonable cost.  Accordingly, Mesa may
be subject to liability or may lose substantial portions of its properties in





                                       6
<PAGE>   8
the event of environmental damages.  The occurrence of an event that is not
fully covered by insurance could have an adverse impact on Mesa's financial
condition and results of operations.

GOVERNMENTAL REGULATION

         General.  Mesa's operations are affected from time to time in varying
degrees by political developments and federal and state laws and regulations.
In particular, oil and natural gas production, operations and economics are or
have been affected by price controls, taxes and other laws relating to the oil
and natural gas industry, by changes in such laws and by changes in
administrative regulations.  Mesa cannot predict how existing laws and
regulations may be interpreted by enforcement agencies or court rulings,
whether additional laws and regulations will be adopted, or the effect such
changes may have on its business or financial condition.

         Environmental.  Mesa's operations are subject to numerous laws and
regulations governing the discharge of materials into the environment or
otherwise relating to environmental protection.  These laws and regulations
require the acquisition of a permit before drilling commences, restrict the
types, quantities and concentration of various substances that can be released
into the environment in connection with drilling and production activities,
limit or prohibit drilling activities on certain lands lying within wilderness,
wetlands and other protected areas, and impose substantial liabilities for
pollution which might result from Mesa's operations.  Moreover, the recent
trend toward stricter standards in environmental legislation and regulation is
likely to continue.  For instance, legislation has been proposed in Congress
from time to time that would reclassify certain crude oil and natural gas
exploration and production wastes as "hazardous wastes" which would make the
reclassified wastes subject to much more stringent handling, disposal and
clean-up requirements.  If such legislation were to be enacted, it could have a
significant impact on the operating costs of Mesa, as well as the oil and gas
industry in general.  Initiatives to further regulate the disposal of crude oil
and natural gas wastes are also pending in certain states, and these various
initiatives could have a similar impact on Mesa.  Mesa could incur substantial
costs to comply with environmental laws and regulations.  In addition to
compliance costs, government entities and other third parties may assert
substantial liabilities against owners and operators of oil and gas properties
for oil spills, discharge of hazardous materials, remediation and clean- up
costs and other environmental damages, including damages caused by previous
property owners.  The imposition of any such liabilities on Mesa could have a
material adverse effect on Mesa's financial condition and results of
operations.

         The Oil Pollution Act of 1990 imposes a variety of regulations on
"responsible parties" related to the prevention of oil spills.  The
implementation of new, or the modification of existing, environmental laws or
regulations, including regulations promulgated pursuant to the Oil Pollution
Act of 1990, could have a material adverse impact on Mesa.

COMPETITION

         Mesa operates in the highly competitive areas of natural gas and oil
production, development and exploration with other companies.  Mesa also
competes with companies for the acquisition of desirable natural gas and oil
properties, as well as for the equipment and labor required to develop and
operate such properties.  Factors affecting Mesa's ability to compete in the
marketplace include the availability of funds and information relating to a
property, the standards established by Mesa for the minimum projected return on
investment, the availability of alternate fuel sources and the intermediate
transportation of gas.  Mesa's competitors include major integrated oil
companies and a substantial number of independent energy companies, many of
which may have substantially larger financial resources, staffs and facilities
than Mesa.


                                USE OF PROCEEDS

         Except as otherwise described in any Prospectus Supplement, the net
proceeds from the sale of Securities will be used for general corporate
purposes, which may include acquisitions, working capital, capital
expenditures, repayment of indebtedness and repurchases and redemptions of
securities.





                                       7
<PAGE>   9
                       RATIO OF EARNINGS TO FIXED CHARGES

         The following table sets forth the consolidated fixed charges in
excess of earnings for the Company for the indicated periods.


<TABLE>
<CAPTION>
                                                                     Year Ended December 31,                 
                            Nine Months Ended      ----------------------------------------------------------
                            September 30, 1996        1995         1994        1993        1992        1991  
                            ------------------     ----------   ---------   ----------   --------   ---------
 <S>                               <C>               <C>          <C>        <C>          <C>         <C>
 Fixed charges in excess
 of earnings(a)  . . . .           67,441            58,476       83,460     109,650      95,451      82,582
</TABLE>

- -------------- 
(a)    For purposes of calculating fixed charges in excess of earnings,
       earnings consist of net income (loss) after depreciation, depletion and
       amortization, but before fixed charges, income taxes, minority interest
       and the loss of an investment accounted for under the equity method.
       Fixed charges consist of interest expense and capitalized interest.
       Earnings were not adequate to cover fixed charges in the indicated
       periods.


                         DESCRIPTION OF DEBT SECURITIES

       The following description sets forth certain provisions of the Debt
Securities to which any Prospectus Supplement may relate.  The particular terms
of the Debt Securities offered by any Prospectus Supplement and the extent, if
any, to which such general provisions may apply to the Debt Securities so
offered will be described in the Prospectus Supplement relating to such Debt
Securities.  The Debt Securities constitute either Senior Debt Securities or
Subordinated Debt Securities.  The Senior Debt Securities are to be issued
under a Senior Indenture dated as of           , 1997 (the "Senior Indenture")
among MOC, the Company and Bankers Trust Company, as trustee, to be entered
into prior to the issuance of any Senior Debt Securities.  The Subordinated
Debt Securities are to be issued under a Subordinated Indenture dated as of
, 1997 (the "Subordinated Indenture") among MOC, the Company and Bankers Trust
Company, as trustee, to be entered into prior to the issuance of any
Subordinated Debt Securities.  Each of the Senior Indenture and the
Subordinated Indenture is referenced herein as an "Indenture" and both of such
indentures are referenced herein collectively as the "Indentures." A form of
each of the Indentures is filed as an exhibit to the Registration Statement.

       The terms of the Debt Securities include those stated in the applicable
Indentures and those made part of such Indentures by reference to the Trust
Indenture Act of 1939, as amended (the "Trust Indenture Act").  The Debt
Securities are subject to all such terms, and prospective purchasers are
referred to the applicable Indentures and the Trust Indenture Act for a
statement of those terms.  The following summaries of certain provisions of
each of the Indentures do not purport to be complete, and are subject to and
are qualified in their entirety by reference to all of the provisions of the
respective Indenture, including the definitions of certain terms used therein.
Wherever particular defined terms of the Indentures are referenced, it is
intended that such defined terms shall be incorporated herein by reference in
their entirety.  Unless otherwise noted, such references to particular defined
terms refer to such defined terms in each of the Indentures.  Capitalized terms
used but not defined in this section captioned "Description of Debt Securities"
shall have the respective meanings given to them in the Indentures.  Further
terms of the Debt Securities in respect of which this Prospectus is being
delivered will be set forth in the applicable Prospectus Supplement.

RANKING OF THE DEBT SECURITIES

         The Senior Debt Securities will rank pari passu with all other debt of
MOC that is unsecured and unsubordinated.  The Subordinated Debt Securities
will rank junior to all Senior Debt (as hereinafter defined) of MOC that may be
outstanding from time to time.  See "--Provisions Applicable to the
Subordinated Indenture."





                                       8
<PAGE>   10
GUARANTEES

         MOC's payment obligations under the Debt Securities will be
unconditionally guaranteed (the "Guarantees") by the Company.  The Guarantees
relating to any Subordinated Debt Securities will be subordinated to
indebtedness of the Company to the same extent and in the same manner as the
Subordinated Debt Securities are subordinated to Senior Debt.  See
"--Provisions Applicable to the Subordinated Debt Indenture."

         Each Indenture will provide that the Company may not consolidate with
or merge into or sell, assign, transfer or lease all or substantially all of
its assets to another corporation or other person other than MOC, unless (i)
the person is a corporation organized under the laws of the United States of
America or any state thereof, (ii) the person assumes by supplemental indenture
all the obligations of the Company relating to such Indenture and the Debt
Securities issued thereunder, (iii) immediately after the transaction, no
Default or Event of Default exists.

GENERAL PROVISIONS APPLICABLE TO BOTH OF THE INDENTURES

         Debt Securities consisting of unsecured debentures, notes and other
evidences of indebtedness may be issued from time to time in series under each
of the Indentures.  The Indentures do not limit the aggregate principal amount
of Debt Securities or of any particular series of Debt Securities that may be
issued thereunder nor do they, unless otherwise stated in the applicable
Prospectus Supplement, restrict transactions between MOC and its Affiliates,
the payment of dividends by MOC or the transfer of assets by MOC to the Company
or any subsidiaries of the Company.

         Reference is made to the applicable Prospectus Supplement for the
following terms and other information with respect to the Debt Securities being
offered hereby: (i) the title of such Debt Securities; (ii) any limit on the
aggregate principal amount of such Debt Securities; (iii) the date or dates (or
manner of determining the same) on which such Debt Securities will mature; (iv)
the rate or rates (or manner of determining the same) at which such Debt
Securities will bear interest, if any, and the date or dates from which such
interest will accrue; (v) the dates (or manner of determining the same) on
which such interest will be payable and the Regular Record Dates for such
Interest Payment Dates; (vi) the place or places where the principal of and
premium, if any, and interest, if any, on such Debt Securities will be payable;
(vii) the obligation of MOC, if any, to redeem or purchase Debt Securities
pursuant to any mandatory or optional sinking fund or analogous provisions;
(viii) the date, if any, after which, and the price or prices at which, such
Debt Securities are payable pursuant to any optional or mandatory redemption
provisions; (ix) the denominations in which such Debt Securities will be
issuable, if other than denominations of $1,000 and any integral multiple
thereof; (x) whether such Debt Securities are to be issued as discounted Debt
Securities; (xi) any "Events of Default" with respect to such Debt Securities
in addition to those described herein; (xii) whether such Debt Securities are
to be issued, in whole or in part, in the form of one or more global securities
("Global Securities") and, if so, the identity of the depositary, if any, for
such Global Securities; (xiii) the identity of any trustee, authenticating
agent, paying agent or registrar with respect to such Debt Securities, if other
than the Trustee under such Indenture; (xiv) the period or periods within
which, the price or prices at which, and the terms and conditions upon which
Debt Securities of such series may be converted into other Debt Securities of
MOC; and (xv) any other specific terms of such Debt Securities.

         Pursuant to each Indenture, and unless otherwise indicated in the
applicable Prospectus Supplement, principal of and premium, if any, and
interest, if any, on the Debt Securities issued pursuant to such Indenture will
be payable, and the transfer of such Debt Securities will be registrable, at
the office or agency of the Trustee under such Indenture in New York City,
except that, at the option of MOC, interest may be paid by mailing a check on
or before the due date to the person entitled thereto as it appears on the
Security Register for such Debt Securities.  No service charge will be made to
any Holder for any transfer or exchange of Debt Securities, except that MOC may
require payment of a sum sufficient to cover any tax or other governmental
charge that may be imposed in relation thereto.

         Some or all of the Debt Securities may be issued as discounted Debt
Securities (bearing no interest or bearing interest at a rate that at the time
of issuance is below market rates) to be sold at a substantial discount below
their stated principal amount.  Federal income tax consequences and other
special considerations applicable to any such discounted Debt Securities will
be described in the applicable Prospectus Supplement.





                                       9
<PAGE>   11
         Unless otherwise stated in the applicable Prospectus Supplement, there
are no covenants or provisions contained in the Indentures that may afford
Holders of Debt Securities protection in the event of a change of control of
the Company or MOC or a restructuring or other highly leveraged transactions
involving the Company or MOC.

         Global Securities

         The Debt Securities of a series may be issued, in whole or in part, in
the form of one or more Global Securities that will be deposited with or on
behalf of a depositary (a "Depositary") identified in the Prospectus Supplement
relating to such series.

         Book-Entry Securities

         Unless otherwise indicated in the applicable Prospectus Supplement,
Debt Securities that are to be represented by a Global Security to be deposited
with or on behalf of a Depositary will be represented by a Global Security
registered in the name of such Depositary or its nominee.  Upon the issuance of
a Global Security in registered form, the Depositary for such Global Security
will credit, on its book-entry registration and transfer system, the respective
principal amounts of the Debt Securities represented by such Global Security to
the accounts of institutions that have accounts with such Depositary or its
nominee ("participants").  The accounts to be credited shall be designated by
the underwriters or agents of such Debt Securities or by MOC, if such Debt
Securities are offered and sold directly by MOC.  Ownership of beneficial
interests in such Global Securities will be limited to participants or persons
that may hold interests through participants.  Ownership of beneficial
interests by participants in such Global Securities will be shown on, and the
transfer of such ownership interests will be effected only through, records
maintained by the Depositary or its nominee for such Global Security.
Ownership of beneficial interests in Global Securities by persons that hold
through participants will be shown on, and the transfer of such ownership
interests within such participant will be effected only through, records
maintained by such participant.  The laws of some jurisdictions require that
certain purchasers of Debt Securities take physical delivery of such Debt
Securities in definitive form.  Such laws may impair the ability to transfer
beneficial interests in a Global Security.

         So long as the Depositary for a Global Security in registered form, or
its nominee, is the registered owner of such Global Security, such Depositary
or such nominee, as the case may be, will be considered the sole owner or
holder of the Debt Securities represented by such Global Security for all
purposes under the Indenture governing such Debt Securities.  Except as set
forth below, owners of beneficial interests in such Global Securities will not
be entitled to have Securities of the series represented by such Global Debt
Security registered in their names, will not receive or be entitled to receive
physical delivery of Securities of such series in definitive form and will not
be considered the owners or holders thereof under the applicable Indenture.

         Payment of principal of and premium, if any, and interest, if any, on
Debt Securities registered in the name of or held by a Depositary or its
nominee will be made to the Depositary or its nominee, as the case may be, as
the registered owner or holder of the Global Security representing such Debt
Securities.  None of MOC or the Trustee, the Paying Agent or the Registrar for
such Debt Securities will have any responsibility or liability for any aspect
of the records relating to or payments made on account of beneficial ownership
interests in a Global Security for such Debt Securities or for maintaining,
supervising or reviewing any records relating to such beneficial ownership
interests.

         MOC expects that the Depositary for Debt Securities of a particular
series, upon receipt of any payment of principal of and premium, if any, and
interest, if any, on a Global Security, will immediately credit participants'
accounts with payments in amounts proportionate to their respective beneficial
interests in the principal amount of such Global Security as shown on the
records of such Depositary.  MOC also expects that payments by participants to
owners of beneficial interests in such Global Security held through such
participants will be governed by standing instructions and customary practices,
as is now the case with Debt Securities held for the accounts of customers in
bearer form or registered in "street name," and will be the responsibility of
such participants.  However, MOC has no control over the practices of the
Depositary or the participants and there can be no assurance that these
practices will not be changed.

         A Global Security may not be transferred except as a whole by the
Depositary for such Global Security to a nominee of such Depositary or by a
nominee of such Depositary to such Depositary or another nominee of such
Depositary or by such Depositary or any such nominee to a successor of such
Depositary or a nominee of such





                                       10
<PAGE>   12
successor.  If a Depositary for Debt Securities of a particular series is at
any time unwilling or unable to continue as Depositary and a successor
Depositary is not appointed by MOC within 90 days, MOC will issue Debt
Securities in definitive registered form in exchange for the Global Security or
Debt Securities representing such Debt Securities.  In addition, MOC may at any
time and in its sole discretion determine not to have any Debt Securities
represented by one or more Global Securities and, in such event, will issue
Debt Securities in definitive form in exchange for the Global Securities
representing such Debt Securities.  In any such instance, an owner of a
beneficial interest in a Global Security will be entitled to physical delivery
in definitive form of Debt Securities of the series represented by such Global
Security equal in principal amount to such beneficial interest and to have such
Debt Securities registered in its name.

         Restrictions on Mergers, Consolidations and Transfers of Assets

         Each of the Indentures provides that MOC will not consolidate or merge
into or sell, assign, transfer or lease all or substantially all of its assets
to another person unless (i) the person is a corporation organized under the
laws of the United States of America or any state thereof, (ii) the person
assumes by supplemental indenture all the obligations of MOC relating to such
Indenture and the Debt Securities issued thereunder and (iii) immediately after
the transaction no Default or Event of Default exists.  Upon any such
consolidation, merger, sale, assignment or transfer, the successor corporation
will be substituted for MOC under such Indenture and MOC may thereafter
liquidate and dissolve.  The successor corporation may then exercise every
power and right of MOC under such Indenture, and MOC will be released from all
of its liabilities and obligations in respect of such Debt Securities and such
Indenture.  Each Indenture also provides that in the event MOC leases all or
substantially all of its assets, the lessee corporation will be the successor
to MOC and may exercise every power and right of MOC such Issuer under such
Indenture, but MOC will not be released from its obligations to pay the
principal of and premium, if any, and interest, if any, on the Debt Securities
issued under such Indenture.

         Amendments of the Indentures

         Amendments of each of the Indentures or the Debt Securities of any
series issued thereunder may be made by MOC and the Trustee thereunder without
the consent of the Holders of such Debt Securities (i) to cure any ambiguity,
defect or inconsistency or to make such provisions with respect to matters or
questions arising under such Indenture as may be necessary or desirable and not
inconsistent with such Indenture or with any indenture supplemental thereto or
any Board Resolution establishing any series of such Debt Securities, provided
that such amendment does not adversely affect the rights of the Holders
thereof, (ii) to comply with the merger or sale of assets provision in such
Indenture, (iii) to add additional covenants to such Indenture, (iv) to
establish the form or terms of Debt Securities of any additional series to be
issued thereunder, (v) to provide for the acceptance of appointment of a
successor Trustee under such Indenture or (vi) to provide for the exchange of
Global Securities for Debt Securities issued in definitive form and to make a
appropriate changes for such purpose.

         Each of the Indentures provides that amendments of such Indenture
affecting the Debt Securities of any series issued under such Indenture or
amendments of the Debt Securities of such series issued under such Indenture
may be made by MOC and the Trustee under such Indenture with the consent of the
Holders of a majority in aggregate principal amount of the Debt Securities of
such series; provided that, without the consent of each Holder affected, no
such amendment shall be made that will (i) reduce the percentage in principal
amount of the Debt Securities issued under such Indenture whose Holders must
consent to an amendment, (ii) reduce the rate of or change the time for payment
of interest on any Debt Security issued under such Indenture, (iii) reduce the
principal of, change the Stated Maturity of, reduce the amount payable on
redemption of or alter the requirements with respect to the mandatory
redemption, if any, of any Debt Security issued under such Indenture, (iv) make
any such Debt Security payable in money other than that stated in such Debt
Security, (v) make any change in the provisions of such Indenture with respect
to waiver of existing Defaults, rights of Holders to receive payment and to
bring suit for the enforcement of such rights, or the requirement of obtaining
the written consent of each affected Holder to certain amendments of such
Indenture or any Debt Security issued thereunder or (vi) in the case of the
Subordinated Indenture, modify the subordination provisions thereof in a manner
adverse to the Holders.





                                       11
<PAGE>   13
         Events of Default

         Each of the Indentures will provide that each of the following
constitutes an Event of Default with respect to any series of Debt Securities
issued under such Indenture: (i) a default for 30 consecutive days in the
payment when due of interest on any Debt Security of such series (in the case
of Subordinated Debt Securities, whether or not prohibited by the subordination
provisions of the Subordinated Indenture); (ii) a default in the payment when
due of the principal of or premium, if any, on any Debt Security of any series
(in the case of Subordinated Debt Securities, whether or not prohibited by the
subordination provisions of the Subordinated Indenture); (iii) the failure by
MOC to comply with its obligations under "Restrictions on Mergers,
Consolidations and Transfers of Assets" above; (iv) the failure by MOC for 60
consecutive days after notice from the applicable Trustee or the Holders of at
least 25% in aggregate principal amount of any Debt Security of such series
then outstanding to comply with any of its other agreements in the applicable
Indenture or applicable Debt Securities for the benefit of such Debt Securities
of such series; (v) except as permitted by the Indentures, the Guarantee of the
Debt Securities of such series shall be held in any judicial proceeding to be
unenforceable or invalid or shall cease for any reason to be in full force and
effect or the Company, or any person acting on behalf of the Company, shall
deny or disaffirm its obligations under such guarantee; (vi) a default under
any mortgage, indenture or instrument under which there may be issued or by
which there may be secured or evidenced any indebtedness for money borrowed by
MOC thereunder, whether such indebtedness now exists or is created after the
date of the Indentures, which default (a) is caused by a failure to pay such
indebtedness within any applicable grace period after final maturity (a
"Payment Default") or (b) results in the acceleration of such indebtedness
prior to its final maturity and, in each case, the principal amount of such
indebtedness, together with the principal amount of any other such indebtedness
under which there is then existing a Payment Default or the maturity of which
has been so accelerated, aggregates $10,000,000 or more; provided, that if any
such default is cured or waived or any such acceleration rescinded, or such
indebtedness is repaid, within a period of 10 days from the continuation of
such default beyond the applicable grace period or the occurrence of such
acceleration, as the case may be, such Event of Default under the Indentures
and any consequential acceleration of the Debt Securities shall be
automatically rescinded; (vii) final judgments or orders rendered against MOC
that are unsatisfied and that require the payment in money, either individually
or in an aggregate amount, that is more than $10,000,000 over the coverage
under applicable insurance policies and either (a) commencement by any creditor
of an enforcement proceeding upon such judgment (other than a judgment that is
stayed by reason of pending appeal or otherwise) or (b) the occurrence of a
60-day period during which a stay of such judgment or order, by reason of
pending appeal or otherwise, was not in effect; (viii) certain events of
bankruptcy or insolvency with respect to MOC or the Company; and (ix) any other
event established as an event of default in accordance with such Indenture with
respect to Debt Securities of such series.

         If any Event of Default occurs and is continuing with respect to any
series of Debt Securities, the applicable Trustee or the Holders of at least
25% in principal amount of any Debt Securities of such series then outstanding
may declare the principal of and accrued but unpaid interest on all the Debt
Securities of such series to be due and payable immediately.  MOC may not pay
the Debt Securities of such series until five business days after such holders
receive such notice of acceleration and, in the case of Subordinated Debt
Securities, thereafter, may pay the Debt Securities of such series only to the
extent the subordination provisions of the Subordinated Indenture permit such
payment.  Notwithstanding the foregoing, in the case of an Event of Default
arising from certain events of bankruptcy or insolvency with respect to MOC,
all outstanding Debt Securities will become due and payable without further
action or notice.  Holders any series of Debt Securities may not enforce the
applicable Indenture of such Debt Securities except as provided in the
applicable Indenture.  Subject to certain limitations, Holders of a majority in
principal amount outstanding of the Debt Securities of such series may direct
the relevant Trustee in its exercise of any trust or power.  Each Trustee may
withhold from Holders of the Debt Securities of such series notice of any
continuing Default or Event of Default (except a Default or Event of Default
relating to the payment of principal or interest) if it determines that
withholding notice is in the interest of the Holders of the Debt Securities of
such series.

         After a declaration of acceleration under an Indenture, but before a
judgment or decree for payment of the money due has been obtained by the
applicable Trustee, Holders of a majority in principal amount outstanding of
the Debt Securities of such series, by written notice to MOC and the applicable
Trustee, may rescind such declaration if (i) MOC has paid or deposited with the
applicable Trustee a sum sufficient to pay (a) all sums paid or advanced by
such Trustee under the applicable Indenture and the reasonable compensation,
expenses, disbursements and advances of such Trustee, its agents and counsel
and (b) all overdue interest on the Debt Securities of such series, if any,
(ii) the rescission would not conflict with any judgment or decree of a court
of competent jurisdiction and (iii) all Events of Default, other





                                       12
<PAGE>   14
than the nonpayment of principal of, premium, if any, and interest on the Debt
Securities of such series that has become due solely by such declaration of
acceleration, have been cured or waived.

         The Holders of a majority in aggregate principal amount outstanding of
the Debt Securities of such series by notice to the relevant Trustee may on
behalf of the Holders of all of the Debt Securities of such series waive any
existing Default or Event of Default and its consequences under the relevant
Indenture except a continuing Default or Event of Default in the payment of
interest or premium on, or the principal of, the Debt Securities of such
series.

         MOC is required to deliver to each Trustee annually a statement
regarding compliance with the relevant Indenture, and MOC is required, within
five business days after becoming aware of any Default or Event of Default, to
deliver to the Trustees a statement specifying such Default or Event of
Default.

         Defeasance of the Indentures and Securities

         Each of the Indentures provides that MOC may at any time satisfy its
obligations with respect to payments of principal of and premium, if any, and
interest, if any, on the Debt Securities of any series issued under such
Indenture by irrevocably depositing in trust with the Trustee under such
Indenture money or U.S. Government Obligations or a combination thereof
sufficient to make such payments when due without reinvestment thereof.  If
such a deposit is sufficient to make all payments of (i) interest, if any, on
the Debt Securities of such series prior to and on their redemption or
maturity, as the case may be, and (ii) principal of and premium, if any, on the
Debt Securities of such series when due upon redemption or at Stated Maturity,
as the case may be, then all the obligations of MOC with respect to the Debt
Securities of such series and such Indenture insofar as it relates to the Debt
Securities of such series will be satisfied and discharged (except as otherwise
provided in such Indenture).  In the event of any such defeasance, Holders of
the Debt Securities of such series would be able to look only to such trust
fund for payment of principal of and premium, if any, and interest, if any, on
the Debt Securities of such series until Stated Maturity or redemption.

         Each of the Indentures also provides that such a trust may only be
established if, among other things, (i) MOC has obtained an opinion of legal
counsel (which may be based on a ruling from, or published by, the Internal
Revenue Service) to the effect that Holders of the Debt Securities of such
series will not recognize income, gain or loss for federal income tax purposes
as a result of such deposit, defeasance and discharge and will be subject to
federal income tax on the same amounts and in the same manner and at the same
times as would have been the case if such deposit, defeasance and discharge had
not occurred and (ii) at that time, with respect to any series of Debt
Securities issued under such Indenture and then listed on The New York Stock
Exchange, the rules of The New York Stock Exchange do not prohibit such deposit
with such Trustee.

         Annual Reports by the Trustee

         To the extent required by the Trust Indenture Act, the Trustee under
each Indenture shall, within 60 days after May 15 in each year, furnish to each
Holder of Debt Securities issued under such Indenture an annual report that
complies with Section 313 of the Trust Indenture Act.  The Indentures do not
require that MOC or the respective Trustee thereunder furnish any other
reports, documents or information to the Holders of Debt Securities.

         Notices and Communications

         Notices or communications to Holders of Debt Securities will be given
by first-class mail to the addresses of such Holders as they appear in the Debt
Security Register.

         Holders of Debt Securities may communicate with other Holders of such
Debt Securities with respect to their rights under such Debt Securities or the
Indenture governing such Debt Securities pursuant to the provisions of Section
312(b) of the Trust Indenture Act, which require a trustee to provide
securityholders access to information regarding the addresses of other
securityholders in certain situations.





                                       13
<PAGE>   15
         Governing Law

         The Indentures and the Debt Securities will be governed by and
construed in accordance with the laws of the State of New York.

         Information Concerning the Trustee

         The Trustee under each of the Indentures is Bankers Trust Company.
Pursuant to the Trust Indenture Act, if a default occurs under either of the
Indentures, Bankers Trust Company would be required to resign as Trustee under
one of the Indentures within 90 days of such default unless such default is
cured, duly waived or otherwise eliminated.

PROVISIONS APPLICABLE TO THE SUBORDINATED INDENTURE

         The payment of principal of, premium, if any, and interest on the
Subordinated Debt Securities and any other payment obligations of MOC in
respect of any Subordinated Debt Securities (including any obligation to
repurchase the Subordinated Debt Securities) will be subordinated in right of
payment, as set forth in the Subordinated Indenture, to the prior payment in
full in cash of all Senior Debt (as defined below), whether outstanding on the
date of the Indentures or thereafter incurred.

         Upon any payment or distribution of property or securities to
creditors of MOC of any Subordinated Debt Securities in a liquidation or
dissolution of MOC or in a bankruptcy, reorganization, insolvency, receivership
or similar proceeding relating to MOC or its property, or in an assignment for
the benefit of creditors or any marshaling of MOC's assets and liabilities, the
holders of Senior Debt will be entitled to receive payment in full in cash of
all obligations due in respect of such Senior Debt (including interest after
the commencement of any such proceeding at the rate specified in the applicable
Senior Debt, whether or not a claim for such interest would be allowed in such
proceeding) before the Holders of the Subordinated Debt Securities will be
entitled to receive any payment with respect to the Subordinated Debt
Securities and, until all obligations with respect to Senior Debt are paid in
full in cash, any distribution to which the Holders of the Subordinated Debt
Securities would be entitled shall be made to the holders of Senior Debt
(except that Holders of the Subordinated Debt Securities may receive payments
made from the trust described under "--Defeasance of the Indentures and
Securities" if the deposit into such trust was permitted to be made under the
terms of the applicable Indenture).

         MOC also may not make any payment (whether by redemption, purchase,
retirement, defeasance or otherwise) upon or in respect of such Subordinated
Debt Securities (except from the trust described under "-- Defeasance of the
Indentures and Securities") if (i) a default in the payment of the principal
of, premium, if any, or interest on Designated Senior Debt (as defined below)
occurs or (ii) any other default occurs and is continuing with respect to
Designated Senior Debt that permits, or with the giving of notice or passage of
time or both (unless cured or waived) will permit, holders of the Designated
Senior Debt as to which such default relates to accelerate its maturity and the
Trustees receive a notice of such default (a "Payment Blockage Notice") from a
representative of the holders of any Designated Senior Debt.  Cash payments on
any Subordinated Debt Securities shall be resumed (a) in the case of a payment
default, upon the date on which such default is cured or waived and (b) in case
of a nonpayment default, the earliest of (1) the date on which such nonpayment
default is cured or waived, (2) the date the applicable Payment Blockage Notice
is retracted by written notice to the Trustees from a representative or the
holders of the Designated Senior Debt that have given such Payment Blockage
Notice and (3) 179 days after the date on which the applicable Payment Blockage
Notice is received, unless any of the events described in clause (i) of this
paragraph has then occurred and is continuing or a default of the type
described in clause (ix) under the caption "Events of Default" has occurred.
No new period of payment blockage may be commenced unless and until 360 days
have elapsed since the date of commencement of the payment blockage period
resulting from the immediately prior Payment Blockage Notice.  No nonpayment
default in respect of Designated Senior Debt that existed or was continuing on
the date of delivery of any Payment Blockage Notice to the Trustees shall be,
or be made, the basis for a subsequent Payment Blockage Notice.

         The Subordinated Indenture will further require that MOC promptly
notify Holders of Senior Debt if payment of such Subordinated Debt Securities
is accelerated because of an Event of Default.  As a result of the
subordination provisions described above, in the event of a liquidation or
insolvency of MOC.  Holders of such Subordinated Debt





                                       14
<PAGE>   16
Securities may recover less ratably than creditors of MOC who are holders of
Senior Debt.  The principal amount of Senior Debt of Mesa outstanding at
September 30, 1996 would have been approximately $355 million.

         The terms "Senior Debt" and "Designated Senior Debt" are defined in
the Subordinated Indenture to have the meaning given to such term in the Board
Resolution or supplemental indenture pursuant to which Debt Securities may be
issued in accordance with such Subordinated Indenture.  The definition of such
terms will be set forth in the Prospectus Supplement respecting any such Debt
Securities.


                          DESCRIPTION OF CAPITAL STOCK

AUTHORIZED CAPITAL STOCK

         The authorized capital stock of the Company consists of 600 million
shares of Common Stock, par value $.01 per share, and 500 million shares of
Preferred Stock, par value $.01 per share, of which 140 million shares have
been designated as Series A Preferred Stock, 140 million shares have been
designated as Series B Preferred Stock and 1,000,000 shares have been
designated as Series A Junior Participating Preferred Stock.  As of December
31, 1996, 64,279,568 shares of Common Stock, 60,443,259 shares of Series A
Preferred Stock and 61,200,427 shares of Series B Preferred Stock were issued
and outstanding.

COMMON STOCK

         Holders of Common Stock have no preemptive rights to purchase or
subscribe for securities of the Company, and the Common Stock is not
convertible into any other securities or subject to redemption by the Company.

         Subject to the rights of the holders of any class of capital stock of
the Company having any preference or priority over the Common Stock, the
holders of the Common Stock are entitled to dividends in such amounts as may be
declared by the Board of Directors of the Company from time to time out of
funds legally available for such payments and, in the event of liquidation, to
share ratably in any assets of the Company remaining after payment in full of
all creditors and provision for any liquidation preferences on any outstanding
Preferred Stock ranking prior to the Common Stock.

         American Stock Transfer & Trust Company serves as registrar and
transfer agent for the Common Stock.

PREFERRED STOCK

         The Board of Directors, without further action by the shareholders, is
authorized to issue up to 500 million shares of preferred stock in one or more
series and to fix and determine as to any series all the relative rights and
preferences of shares in such series, including, without limitation,
preferences, limitations or relative rights with respect to redemption rights,
conversion rights, if any, voting rights, if any, dividend rights and
preferences on liquidation.

         The terms of the Series A Preferred Stock and Series B Preferred Stock
are identical in all respects, except as described below under "Voting Rights"
and "Transferability; Conversion of Series B to Series A Preferred Stock."

         Voting Rights.  Subject to certain special voting rights of the
holders of Series B Preferred Stock (described below), holders of Series A and
Series B Preferred Stock will generally have the right to vote (on an
as-converted basis) as a single class with the holders of Common Stock on all
other matters coming before the Company's stockholders, except matters for
which class voting is required under the Company's Articles of Incorporation,
including the Statement of Resolution establishing the Preferred Stock, or the
Texas Business Corporation Act (the "TBCA").

         With respect to any matter for which class voting is required by the
TBCA, except as otherwise described herein or required by law, the holders of
Series A and Series B Preferred Stock will vote together as a single class and
not as separate classes or series apart from each other, including any vote to
approve or adopt (i) any plan of merger, consolidation or share exchange for
which the TBCA requires a stockholder vote; (ii) any disposition of assets for
which





                                       15
<PAGE>   17
the TBCA requires a stockholder vote; and (iii) any dissolution of the Company
for which the TBCA requires a stockholder vote.

         The following matters will require the approval of the holders of at
least a majority of the outstanding Series A and Series B Preferred Stock,
voting together as a single class:

                 (i)      the authorization, creation or issuance, or any
         increase in the authorized or issued amount, of any class or series of
         stock ranking senior to or in parity with the Series A or Series B
         Preferred Stock or any security convertible into or exchangeable for
         any such class or series (provided that, if the holders of Series A
         and Series B are affected differently, each series will vote as a
         separate class); or

                 (ii)     any amendment of the Company's Articles of
         Incorporation to eliminate cumulative voting.

         Without the affirmative vote or consent of the holders of two-thirds
of the shares of Series A Preferred Stock voting as a separate class, the
Company may not adopt any amendment to the Articles of Incorporation or the
Bylaws that would materially affect the terms of the Series A Preferred Stock.
Without the affirmative vote or consent of the holders of at least a majority
of the shares of Series B Preferred Stock voting as a separate class, the
Company may not adopt any amendment to the Articles of Incorporation or the
Bylaws that would materially affect the terms of the Series B Preferred Stock.

         For so long as any shares of Series B Preferred Stock remain
outstanding, the affirmative vote or consent of the holders of at least a
majority of such shares will be required in order to permit, affect or validate
the amendment, alteration or repeal of any provisions of the Articles of
Incorporation (including the Statement of Resolution relating to the Series A
and Series B Preferred Stock) or Bylaws of the Company that would limit the
authority of the Board to amend or repeal any provision of The Company's
Bylaws, or that would adversely affect any rights, preferences, privileges or
voting power of the Series B Preferred Stock differently from the rights,
preferences, privileges or voting power of the Series A Preferred Stock (to the
extent such rights, preferences, privileges or voting power of such two series
are the same prior to such amendment).

         For so long as the Minimum Ownership Condition is satisfied, the
holders of the Series B Preferred Stock will be entitled, voting separately as
a class, to elect a majority of the members of the Company's Board (excluding
any Series A Directors, as defined below).  The directors elected by the
holders of Series B Preferred Stock (the "Series B Directors") may be removed
with or without cause, and may only be removed by a vote or consent of the
holders of a majority of the outstanding shares of Series B Preferred Stock,
voting separately as a class.  Vacancies among the Series B Directors will be
filled by a majority vote of the remaining Series B Directors or by the holders
of Series B Preferred Stock.  Upon any termination of the right of the holders
of Series B Preferred Stock to elect Series B Directors, (i) the Series B
Directors then serving may continue to hold office for the remainder of their
term, subject to the right of the majority of the other directors (other than
any Series A Directors) to request their prior resignation, and (ii) upon the
expiration of the term of office or earlier resignation of each Series B
Director, the size of the Board will automatically be reduced accordingly
unless a majority of the non-Series B Directors by resolution determine
otherwise and elect additional directors to fill any resulting vacancies.

         If the Company is in arrears in the payment of dividends (whether
payable in cash or in kind) on the shares of Series A and Series B Preferred
Stock for a total of six quarters, then the size of the Board will
automatically be increased by two additional directors and the holders of
Series A Preferred Stock, voting as a separate class, will have the exclusive
right to elect two directors (the "Series A Directors") immediately and at the
next and every subsequent annual meeting of shareholders called for the
election of directors.  The right of the Series A Preferred holders to elect
the Series A Directors will terminate when all dividends accumulated on the
Series A Preferred Stock have been paid in full, subject to revesting at such
time as the Company is again in arrears in the payment of dividends.

         During any period in which the holders of Series A Preferred Stock are
entitled to elect Series A Directors, or the holders of Series B Preferred
Stock are entitled to elect Series B Directors, the holders of Series A and
Series B Preferred Stock will have certain special rights to call a special
meeting of the Company in lieu of the Company's annual meeting or for the
purpose of electing Series A or Series B Directors.  At a meeting held for the
purpose of electing a





                                       16
<PAGE>   18
Series A or Series B Director, at least one-third of the outstanding shares of
Series A Preferred Stock or Series B Preferred Stock, as applicable, present in
person or by proxy, will be required to constitute a quorum.

         During any period in which the holders of Series B Preferred Stock are
entitled to elect Series B Directors, (i) the holders of Series B Preferred
Stock will not be entitled to vote in the election of any directors other than
the Series B Directors, (ii) no Series B Director will have the right to vote
in the election of any person to fill any vacancy on the Board, other than a
vacancy of a Series B Director, and all such rights with respect to non-Series
A and Series B Directors will be exercised for and on behalf of the Board by a
majority of the non-Series A and Series B Directors, and (iii) only the
non-Series A and Series B Directors will have the right to vote in any action
by or on behalf of the Board with respect to nominating persons to serve as
non-Series A and Series B Directors to be elected at any meeting of
shareholders that is held after the 1996 annual meeting of shareholders.  The
persons to be nominated by or on behalf of the Board for election as non-Series
A and B Directors at the 1996 annual meeting will be the persons most recently
designated as such nominees by action of the Board prior to the date of the
First Closing (or, if any of such nominees shall be unable or unwilling to
serve, such other person or persons as shall be designated by the other such
nominee or nominees), unless otherwise agreed after such date by the unanimous
vote of all non-Series A and B Directors then in office.  Nothing in clause
(ii) or (iii) above shall limit or restrict the right of holders of shares of
Common Stock and Series A Preferred Stock to nominate and to elect, subject to
and in accordance with applicable law, the other provisions of the Articles of
Incorporation and the Bylaws, persons to serve as non-Series A and Series B
Directors.  The foregoing provision may not be amended without (x) the
affirmative vote of the holders of a majority of the outstanding shares of
Common Stock and (y) the affirmative vote of the holders of a majority of the
outstanding shares of Series A Preferred Stock.

         Dividends.  Subject to the satisfaction of certain conditions
described below, holders of Preferred Stock will be entitled to receive, as and
when declared by the Company out of funds legally available therefor,
cumulative dividends at the rate of 8.0% per annum of the stated value (the
"Stated Value") of such shares (initial stated value of $2.26), compounded
quarterly.  Dividends will be payable quarterly in arrears on the last business
day of each March, June, September and December, beginning September 30, 1996.
Prior to the fourth anniversary of the issuance of the Preferred Stock,
dividends will be payable in additional shares of Preferred Stock, based upon
their Stated Value.  On and after the fourth anniversary of the issue date, the
Company may elect to pay dividends in cash rather than shares of Preferred
Stock for any quarter in which any of the following conditions is satisfied as
of the record date for such dividend:

                 Fixed Charge Coverage Ratio.  The Company's average Fixed
         Charge Coverage Ratio at the end of the four preceding quarters is in
         excess of 2.5.  "Fixed Charge Coverage Ratio" means the ratio of (i)
         the sum of (A) Consolidated EBITDA plus (B) one-third of gross
         operating rents paid before sublease income (as defined by Standard &
         Poors Corporation), if any ("Gross Rents") to (ii) the sum of (A)
         interest expense, both expensed and capitalized, of the Company and
         its consolidated subsidiaries, plus (B) one-third of Gross Rents plus
         (C) scheduled principal amortization of indebtedness (including
         borrowed money and capitalized leases) of the Company and its
         consolidated subsidiaries.  "Consolidated EBITDA" means the
         consolidated net income or loss of the Company for the period,
         excluding gains and losses not arising from operations (including
         interest income, gains and losses from investments, gains and losses
         from dispositions of oil and gas properties, collections and
         settlements of claims and litigation, adjustments of contingency
         reserves and other extraordinary gains and losses), plus, to the
         extent the following have been deducted in determining such income or
         loss, interest expense, income taxes, depreciation, depletion and
         amortization expense and impairment expense.

                 Gas Price Realization.  The Average Gas Equivalent Price
         realized by the Company on an Mcf equivalent basis (using a 6:1
         conversion ratio) during the four preceding quarters as reported in
         the Company's financial statements is in excess of $2.95.  "Average
         Gas Equivalent Price" means the average price received by the Company
         from sales of oil and gas production, to be calculated as follows:

                 (i)      the aggregate revenues of the Company and its
         consolidated subsidiaries during such period from sales of natural
         gas, natural gas liquids and oil and condensate produced (other than
         that used for fuel, and shrinkage) and sold by the Company and its
         consolidated subsidiaries, as reported in the Company's consolidated
         financial statements, divided by





                                       17
<PAGE>   19
                 (ii)     the sum of (A) the total volume, on an Mcf basis, of
         natural gas produced (other than that used for fuel, and shrinkage)
         and sold by the Company and its consolidated subsidiaries during such
         period plus (B) the product of 6 times the total number of barrels of
         natural gas liquids, oil and condensate produced (other than that used
         for fuel, and shrinkage) and sold by the Company and its consolidated
         subsidiaries during such period, as derived from the Company's
         consolidated financial statements.

                 Stock Price Threshold.  The average closing price of the
         Common Stock during any 90 consecutive trading days preceding the
         tenth day prior to the record date for any dividend payment date after
         the fourth anniversary of the issue date is more than three times the
         conversion price then in effect.

         If the stock price threshold described above is met, the Company will
thereafter have the option to pay dividends either in kind or in cash on any
subsequent dividend payment date, regardless of any subsequent changes in the
price of the Common Stock.  However, the indentures governing the Notes and the
Credit Facility may limit the Company's ability to pay cash dividends even if
permitted by the terms of the Preferred Stock.

         To the extent dividends are not paid in cash or in kind on a scheduled
dividend payment date, all accrued but unpaid dividends will be added to the
Stated Value of each share of Preferred Stock outstanding and shall remain a
part thereof until paid, and dividends will accrue and be paid thereafter on
the basis of the Stated Value, as adjusted.

         Conversion.  Shares of Series A and Series B Preferred Stock are
convertible into shares of Common Stock at any time at the option of the
holder, at an initial conversion ratio of one share of Common Stock per share
of Preferred Stock.  The conversion ratio is subject to customary anti-dilution
adjustment in the event the Company (a) subdivides the outstanding shares of
Common Stock into a greater number of shares; (b) combines the outstanding
shares of Common Stock into a smaller number of shares; (c) declares, orders,
pays or makes any dividend or other distribution to holders of Common Stock
payable in Common Stock; (d) declares, orders, pays or makes any dividend or
other distribution to all holders of Common Stock, other than a dividend
payable in shares of Common Stock (including dividends or distributions payable
in cash, evidences of indebtedness, rights, options or warrants to subscribe
for or purchase shares of Common Stock or other securities, or any other
securities or other property, but excluding any rights to purchase stock or
other securities if such rights are not separable from the Common Stock except
upon occurrence of a contingency beyond the control of the Company); or (e)
issues or sells any shares of Common Stock or any rights, options, warrants to
subscribe for or purchase shares of Common Stock or shares having the same
rights, privileges and preferences as the Common Stock or securities
convertible into Common Stock or equivalent common stock, at a price per share
of Common Stock or equivalent common stock (or having a conversion price per
share, in the case of a security convertible into shares of Common Stock or
equivalent common stock) less than the market price of the Common Stock on the
date of such issue or sale, other than (i) the conversion or redemption of
shares of Series A or Series B Preferred Stock, (ii) the payment of any stock
dividend on the Series A or Series B Preferred Stock, (iii) the issuance of
options to officers, directors and employees of the Company and its
subsidiaries to purchase shares of Common Stock, including any such options as
are issued and outstanding as of the original issue of the Series B Preferred
Stock, (iv) the issuance and sale of Common Stock upon exercise of any rights,
options or warrants described in the foregoing clause (iii) or in clause (d)
above or (v) the issuance and sale of Common Stock in an underwritten public
offering at a price of not less than 95% of the closing price of the Common
Stock on the date of pricing such offering.

         If, at any time after the original issue date, the Company is a party
to any transaction (including a merger, consolidation, statutory share
exchange, sale of all or substantially all of the Company's assets or
recapitalization of the Common Stock), as a result of which shares of Common
Stock (or any other securities of the Company then issuable upon conversion of
the Series A or Series B Preferred Stock) will be converted into the right to
receive stock, securities or other property (including cash) or any combination
thereof (a "Fundamental Change Transaction"), then the shares of Series A and
Series B Preferred Stock remaining outstanding will thereafter no longer be
convertible into Common Stock (or such other securities), but instead each
share will be convertible into the kind and amount of stock and other
securities and property receivable upon the consummation of such Fundamental
Change Transaction by a holder of that number of shares of Common Stock (or
such other securities) into which one share of Series A or Series B Preferred
Stock was convertible immediately prior to such Fundamental Change Transaction
(assuming such holder of Common Stock or other securities failed to exercise
any right of election as to the kind of consideration to be received in such
Fundamental Change Transaction).  The Company is prohibited from being a party
to any Fundamental Change





                                       18
<PAGE>   20
Transaction after which shares of Series A and Series B Preferred Stock will
remain outstanding unless the terms of such Fundamental Change Transaction are
consistent with the foregoing, and it may not consent or agree to the
occurrence of any such Fundamental Change Transaction until it has entered into
an agreement with the successor or purchasing entity, as the case may be, for
the benefit of the holders of the Series A and Series B Preferred Stock
containing provisions enabling such holders to convert such shares into the
consideration received by holders of Common Stock (or other securities of the
Company then issuable upon conversion of Series A or Series B Preferred Stock),
at the conversion ratio then in effect, after such Fundamental Change
Transaction.  In the event that, as a result of an adjustment pursuant to a
Fundamental Change Transaction, the Series A and Series B Preferred Stock
become convertible into any securities other than shares of Common Stock, the
number of such other securities issuable upon conversion will be subject to
adjustment to prevent dilution and adjustment in the event of a successive
Fundamental Change Transaction in a manner and on terms as nearly equivalent as
practicable to those described herein.

         Redemption.  Subject to any restrictions imposed by the terms of the
New Credit Facility or the indentures governing the Notes, the Company may, at
its option, redeem all or part of the outstanding shares of Series A and Series
B Preferred Stock (pro rata or by lot among the outstanding shares of both
series) on any dividend payment date after the thirtieth day following the
tenth anniversary of the original date of issue of the Series B Preferred
Stock.  All outstanding shares of Series A and Series B Preferred Stock are
subject to mandatory redemption on June 30, 2008.  The redemption price upon
any optional or mandatory redemption will be equal to the Stated Value per
share of the shares to be redeemed, plus an amount equal to the dollar amount
of all accrued and unpaid dividends through the redemption date that have not
been added to the Stated Value of such shares.  The redemption price may be
paid either in cash or in shares of Common Stock, at the option of the Company
as announced 30 days prior to the redemption date, with the number of shares of
Common Stock used to pay the redemption price to be determined based upon the
average trading price during the 20 day period ending five days before the
redemption date.

         Liquidation.  Each share of Series A Preferred Stock and Series B
Preferred Stock will rank prior to each share of Common Stock with respect to
the distribution of assets upon a liquidation, dissolution or winding-up of the
Company.  The Series A Preferred Stock and Series B Preferred Stock will be
pari passu as to liquidation rights.  In the event of any such liquidation,
dissolution or winding-up, each holder of a share of Series A Preferred Stock
or Series B Preferred Stock will be entitled to receive, before any
distribution to the holder of Common Stock, a liquidation preference equal to
the Stated Value of such shares, plus all accrued and unpaid dividends thereon.

         Ranking.  The Series A Preferred Stock and the Series B Preferred
Stock rank on a parity with each other as to payment of dividends and
distributions and upon liquidation, dissolution or winding-up of the Company.
In the event that the Company is a party to any merger, consolidation or share
exchange in which the Series A Preferred Stock or Series B Preferred Stock is
converted or exchanged into any other securities, property, cash or other
consideration, the securities, property, cash or other consideration into which
the Series A and Series B Preferred Stock may be converted or exchanged must be
identical in kind and amount per share, and no shares of Series A or Series B
Preferred Stock may be converted or exchanged into any securities, property,
cash or other consideration unless all shares of Series A and Series B
Preferred Stock may be converted or exchanged into the same kind and amount per
share of securities, property, cash or other consideration.  The Common Stock
and the Series A Junior Participating Preferred Stock will rank junior to the
Series A and Series B Preferred Stock with respect to the payments required or
permitted to made to the holders of such securities pursuant to their
respective governing instruments.

         Authorization by Non-Series A and Series B Directors.  A majority of
the Company's directors, other than Series A Directors and Series B Directors,
is required to make the determinations required or permitted (i) as to whether
to make payment of the redemption price of Series A and Series B Preferred
Stock in cash or in kind, (ii) as to whether to exercise the Company's option
to redeem outstanding shares of Series A or Series B Preferred Stock and (iii)
as to whether to make payment of any dividends declared by the Board on the
Series A and Series B Preferred Stock in cash or in kind on or after the fourth
anniversary of the issue date (subject to the requirement that the Company have
sufficient cash legally available to make any cash dividend payment).

         Certain Covenants of the Company.  For so long as any shares of Series
A or Series B Preferred Stock are outstanding, the Company must at all times
reserve and keep available for issuance upon the conversion of such shares such
number of its authorized but unissued shares of Common Stock as will be
sufficient to permit the conversion of all outstanding shares of Series A and
Series B Preferred Stock and all other securities and instruments convertible
into





                                       19
<PAGE>   21
shares of Common Stock.  The Company must endeavor to make the shares of stock
that may be issued upon redemption or conversion of Series A or Series B
Preferred Stock eligible for trading on any national securities exchange or
automated quotation system upon or through which the Common Stock is then
traded.  Prior to the delivery of any securities upon redemption or conversion
of Series A or Series B Preferred Stock, the Company must endeavor to comply
with all federal and state securities laws and regulations requiring the
registration of such securities with, or the approval of or consent to the
delivery of such securities by, any governmental authority.  The Company must
pay all taxes and other governmental charges (other than income or franchise
taxes) that may be imposed with respect to the issue or delivery of shares of
Common Stock upon conversion or redemption of shares of Series A or Series B
Preferred Stock, but will not be required to pay any transfer taxes incurred as
a result of the issuance of shares of Common Stock in a name other than that of
the registered holder of the converted or redeemed shares of Preferred Stock.

         Transferability; Conversation of Series B to Series A Preferred Stock.
The Series A Preferred Stock offered hereby, and the shares of Common Stock
issuable upon conversion thereof, have been registered under the Securities Act
and the Exchange Act.  Accordingly, shares of Series A Preferred Stock and
shares of Common Stock issuable upon conversion thereof will generally be
freely transferrable by the holders thereof.  The Series A Preferred Stock is
listed for trading on the New York Stock Exchange under the symbol "MXPPrA."

         Upon any transfer of shares of Series B Preferred Stock, or the
beneficial ownership thereof, to any person other than DNR, its partners and
their respective affiliates, such shares will automatically convert to an equal
number of shares of Series A Preferred Stock.  In addition, at such time as the
Minimum Ownership Condition is no longer met, all shares of Series B Preferred
Stock then outstanding will automatically convert into an equal number of
shares of Series A Preferred Stock.

         The Company has entered into a Registration Rights Agreement with DNR
which gives DNR certain demand and "piggyback" registration rights.

CONFIDENTIAL VOTE

         The Company's Bylaws provide for an independent third party to collect
and tabulate shareholders' proxies so as to keep the votes of shareholders
confidential from the Company and other persons soliciting proxies, except to
the extent otherwise required by law or to resolve any dispute with respect
thereto.

SPECIAL MEETINGS

         Special meetings of the shareholders of the Company may be called by
the chief executive officer, the Board of Directors or by shareholders holding
not less than 20% of the outstanding voting stock of the Company.  Except as
otherwise provided in the resolutions of the Board of Directors establishing
any class or series of preferred stock, shareholders may not act by written
consent without a meeting.

VOTING

         Holders of Common Stock and Series B Preferred Stock are, and holders
of Series A Preferred Stock will be, entitled to cast one vote per share on
matters submitted to a vote of shareholders, other than election or removal of
directors, which is subject to cumulative voting.  In cumulative voting for
directors, each shareholder is entitled to a number of votes equal to the
number of shares held multiplied by the number of directors to be elected; the
shareholder may cast all such votes for a single director or may cast them for
any or all of the nominees in any manner the shareholder chooses.  Each
director will be elected annually.  Any director may be removed, with or
without cause, at any meeting of shareholders called expressly for that
purpose, by a vote of the holders of a majority of the outstanding shares
entitled to vote in the election of such director, except that, if less than
the entire board is to be removed, no director may be removed if the votes cast
against his removal would be sufficient to elect him if then cumulatively voted
at an election of the entire board.

         Subject to the rights of the holders of the Series A Preferred Stock
and the Series B Preferred Stock and any additional voting rights that may be
granted to holders of future classes or series of stock and to the additional
voting requirements described in the next paragraph, the Company's Articles of
Incorporation require the affirmative vote of





                                       20
<PAGE>   22
holders of a majority of the outstanding shares entitled to vote thereon to
approve any amendment to the Articles of Incorporation, dissolution of the
Company, sale of all or substantially all the assets of the Company, share
exchange or merger for which a vote is required by the Texas Business
Corporation Act.

         The Articles of Incorporation of the Company contain an "equal price"
provision that applies to certain business combination transactions involving
any person or group that beneficially owns 20% or more of the aggregate voting
power of all of the outstanding stock of the Company (a "Related Person").  The
provision requires the affirmative vote of holders of at least 80% of the
voting stock of the Company to approve any merger, consolidation, sale or lease
of all or substantially all of the assets of the Company, issuance or transfer
of the Company's securities or certain other transactions involving the Related
Person.  This voting requirement is not applicable to certain transactions,
including (i) any transaction in which the consideration to be received by the
holders of each class of stock is the same in form and amount as that paid in a
tender offer in which the Related Person acquired at least 50% of the
outstanding shares of each such class and which was consummated not more than
one year earlier, (ii) any other transaction that meets certain other specified
pricing criteria or (iii) any other transaction approved by the Company's
continuing directors (as defined in the Articles of Incorporation).  This
provision could have the effect of delaying or preventing a change of control
of the Company in a transaction or series of transactions that did not satisfy
the "equal price" criteria.

         Approval of any other matter not described above that is submitted to
the shareholders requires the affirmative vote of the holders of a majority of
the shares entitled to vote represented at the meeting.  The holders of a
majority of the shares entitled to vote shall constitute a quorum at meetings
of shareholders.

         The Company's Bylaws provide that shareholders who wish to nominate
directors or to bring business before a shareholders' meeting must notify the
Company and provide certain pertinent information at least 80 days before the
meeting date (or within ten days after public announcement pursuant to the
Bylaws of the meeting date, if the meeting date has not been publicly announced
at least 90 days in advance).

LIMITATION OF DIRECTOR LIABILITY

         The Articles of Incorporation of the Company contain a provision that
limits the liability of the Company's directors as permitted by the Texas
Business Corporation Act.  The provision eliminates the personal liability of
directors to the Company, and its shareholders may be unable to recover
monetary damages against directors for negligent or grossly negligent acts or
omissions in violation of their duty of care.  The provision does not change
the liability of a director for breach of his duty of loyalty to the Company or
to shareholders, acts or omissions not in good faith or which involve
intentional misconduct or a knowing violation of law, an act or omission for
which the liability of a director is expressly provided for by an applicable
statute, or in respect of any transaction from which a director received an
improper personal benefit.  Pursuant to the Articles of Incorporation, the
liability of directors will be further limited or eliminated without action by
shareholders if Texas law is amended to further limit or eliminate the personal
liability of directors.

                              PLAN OF DISTRIBUTION

         The Issuers may sell the Securities in and/or outside the United
States:  (i) through underwriters or dealers; (ii) directly to a limited number
of purchasers or to a single purchaser; or (iii) through agents.  The
Prospectus Supplement with respect to the Securities will set forth the terms
of the offering of the Securities, including the name or names of any
underwriters or agents, the purchase price of the Securities and the proceeds
to the Company from such sale, any delayed delivery arrangements, any
underwriting discounts and other items constituting underwriters' compensation,
any initial public offering price and any discounts or concessions allowed or
reallowed or paid to dealers.  Any initial public offering price and any
discounts or concessions allowed or reallowed or paid to dealers may be changed
from time to time.

         If underwriters are used in the sale, the Securities will be acquired
by the underwriters for their own account and may be resold from time to time
in one or more transactions, including negotiated transactions, at a fixed
public offering price or at varying prices determined at the time of sale.  The
Securities may be offered to the public either through underwriting syndicates
represented by one or more managing underwriters or directly by one or more
firms acting as underwriters.  The underwriter or underwriters with respect to
a particular underwritten offering of Securities





                                       21
<PAGE>   23
to be named in the Prospectus Supplement relating to such offering and, if an
underwriting syndicate is used, the managing underwriter or underwriters will
be set forth on the cover of such Prospectus Supplement.  Unless otherwise set
forth in the Prospectus Supplement relating thereto, the obligations of the
underwriters to purchase the Securities will be subject to conditions precedent
and the underwriters will be obligated to purchase all the Securities if any
are purchased.

         If dealers are utilized in the sale of Securities in respect of which
this Prospectus is delivered, the Issuers will sell such Securities to dealers
as principals.  The dealers may then resell such Securities to the public at
varying prices to be determined by such dealers at the time of resale.  The
names of the dealers and the terms of the transaction will be set forth in the
Prospectus Supplement relating thereto.

         The Securities may be sold directly by the Issuers or through agents
designated by the Company from time to time.  Any agent involved in the offer
or sale of the Securities in respect to which this Prospectus is delivered will
be named, and any commissions payable by the Company to such agent will be set
forth, in the Prospectus Supplement arising thereto.  Unless otherwise
indicated in the Prospectus Supplement, any such agent will be acting on a best
efforts basis for the period of its appointment.

         The Securities may be sold directly by the Issuers to institutional
investors or others, who may be deemed to be underwriters within the meaning of
the Securities Act with respect to any sale thereof.  The terms of any such
sales will be described in the Prospectus Supplement relating thereto.

         If so indicated in the Prospectus Supplement, the Issuers will
authorize agents, underwriters or dealers to solicit offers from certain types
of institutions to purchase Securities from the Issuers at the public offering
price set forth in the Prospectus Supplement pursuant to delayed delivery
contracts providing for payment and delivery on a specified date in the future.
Such contracts will be subject only to those conditions set forth in the
Prospectus Supplement, and the Prospectus Supplement will set forth the
commission payable for solicitation of such contracts.

         Agents, dealers and underwriters may be entitled under agreements
entered into with the Issuers to indemnification by the Issuers against certain
civil liabilities, including liabilities under the Securities Act, or to
contribution with respect to payments which such agents, dealers or
underwriters may be required to make in respect thereof.  Agents, dealers and
underwriters may be customers of, engage in transactions with, or perform
services for the Issuers in the ordinary course of business.

         The Securities may or may not be listed on a national securities
exchange.  No assurances can be given that there will be a market for the
Securities.

                                 LEGAL MATTERS

         Certain legal matters in connection with the Securities offered hereby
will be passed upon for the Issuers by Baker & Botts, L.L.P. Robert L.
Stillwell, a partner of Baker & Botts, L.L.P., is a director of the Company.


                                    EXPERTS

         The consolidated financial statements and schedules of the Company
included in the Company's Annual Report on Form 10-K for the year ended
December 31, 1995 have been audited by Arthur Andersen LLP, independent public
accountants, as indicated in their report with respect thereto, and are
incorporated by reference herein in reliance upon the authority of said firm as
experts in giving said report.





                                       22
<PAGE>   24
                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

         The following are the estimated expenses (other than underwriting
discounts and commissions) of the issuance and distribution of the securities
being registered payable by the Company.


<TABLE>
 <S>                                                                                <C>
 Securities and Exchange Commission registration fee . . . . . . . . . . . . . .    $151,516
 Printing and engraving expenses . . . . . . . . . . . . . . . . . . . . . . . .         *
 Accounting fees and expenses  . . . . . . . . . . . . . . . . . . . . . . . . .         *
 Blue Sky fees and expenses  . . . . . . . . . . . . . . . . . . . . . . . . . .         *
 Listing fees  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         *
 Counsel fees  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         *
 Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         *    
                                                                                    ----------
                  Total  . . . . . . . . . . . . . . . . . . . . . . . . . . . .         *    
                                                                                    ==========
</TABLE>

* To be provided by amendment.

ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         Article 2.02-1 of the Texas Business Corporation Act provides that a
corporation may indemnify any director or officer who was, is or is threatened
to be made a named defendant or respondent in a proceeding because he is or was
a director or officer, provided that the director or officer (i) conducted
himself in good faith, (ii) reasonably believed (a) in the case of conduct in
his official capacity, that his conduct was in the corporation's best
interests, (b) in all other cases, that his conduct was at least not opposed to
the corporation's best interests and (iii) in the case of any criminal
proceeding, had no reasonable cause to believe his conduct was unlawful.
Subject to certain exceptions, a director or officer may not be indemnified if
the person is found liable to the corporation or if the person is found liable
on the basis that he improperly received a personal benefit.  Under Texas law,
reasonable expenses incurred by a director or officer may be paid or reimbursed
by the corporation in advance of a final disposition of the proceeding after
the corporation receives a written affirmation by the director of his good
faith belief that he has met the standard of conduct necessary for
indemnification and a written undertaking by or on behalf of the director to
repay the amount if it is ultimately determined that the director or officer is
not entitled to indemnification by the corporation.  Texas law requires a
corporation to indemnify an officer or director against reasonable expenses
incurred in connection with the proceeding in which he is named defendant or
respondent because he is or was a director or officer if he is wholly
successful in defense of the proceeding.

         Texas law also permits a corporation to purchase and maintain
insurance or another arrangement on behalf of any person who is or was a
director or officer against any liability asserted against him and incurred by
him in such a capacity or arising out of his status as such a person, whether
or not the corporation would have the power to indemnify him against that
liability under Article 2.02-1.

         The Company's Bylaws provide for the indemnification of its officers
and directors, and the advancement to them of expenses in connection with
proceedings and claims, to the fullest extent permitted by the Texas Business
Corporation Act.  The Company has also entered into indemnification agreements
with its executive officers and directors that contractually provide for
indemnification and expense advancement.  Both the Bylaws and the agreements
include related provisions meant to facilitate the indemnitees' receipt of such
benefits.  These provisions cover, among other things: (i) specification of the
method of determining entitlement to indemnification and the selection of
independent counsel that will in some cases make such determination, (ii)
specification of certain time periods by which certain payments or
determinations must be made and actions must be taken and (iii) the
establishment of certain presumptions in favor of an indemnitee.  The benefits
of certain of these provisions are available to an indemnitee only if there has
been a change in control (as defined).  In addition, the Company carries
customary directors' and officers' liability insurance policies for its
directors and officers.  Furthermore, the Bylaws and agreements with directors
and





                                      II-1
<PAGE>   25
officers provide for indemnification for amounts (i) in respect of the
deductibles for such insurance policies, (ii) that exceed the liability limits
of such insurance policies and (iii) that would have been covered by prior
insurance policies of the Company or its predecessors.  Such indemnification
may be made even though directors and officers would not otherwise be entitled
to indemnification under other provisions of the Bylaws or such agreements.

         The above discussion of the Company's Bylaws and of Article 2.01-1 of
the Texas Business Corporation Act is not intended to be exhaustive and is
respectively qualified in its entirety by such statute and the Bylaws.

         Section 145 of the Delaware General Corporation Law (the "DGCL")
permits a corporation to indemnify any director or officer of the corporation
against expenses (including attorneys' fees), judgments, fines and amounts paid
in settlement actually and reasonably incurred in connection with any action,
suit or proceeding brought by reason of the fact that such person is or was a
director or officer of the corporation, if such person acted in good faith and
in a manner that he reasonably believed to be in or not opposed to the best
interests of the corporation and, with respect to any criminal action or
proceeding, if he had no reason to believe his conduct was unlawful.  In a
derivative action (i.e., one brought by or on behalf of the corporation),
indemnification may be made only for expenses actually and reasonably incurred
by any director or officer in connection with the defense or settlement of such
an action or suit, if such person acted in good faith and in a manner that he
reasonably believed to be in or not opposed to the best interests of the
corporation, except that no indemnification shall be made if such person shall
have been adjudged to be liable to the corporation, unless and only to the
extent that the court in which the action or suit was brought shall determine
that the defendant is fairly and reasonably entitled to indemnity for such
expenses despite such adjudication of liability.

         Delaware law also permits a corporation to purchase and maintain
insurance on behalf of any person who is or was a director or officer against
any liability asserted against him and incurred by him in such capacity or
arising out of his status as such, whether or not the corporation has the power
to indemnify him against that liability under Section 145 of the DGCL.

         MOC's Bylaws provide that MOC may indemnify each person who is
involved in any litigation or other proceeding because such person is or was a
director or officer of MOC or its subsidiaries or is or was serving as an
officer or director of another entity at the request of MOC, against all
expenses reasonably incurred in connection therewith.  Such indemnification
shall be made upon a determination by the Board of Directors, independent legal
counsel or the stockholders of the corporation that such indemnification is
proper in the circumstances because such person has met the applicable standard
of conduct The Bylaws also provide that MOC shall indemnify a director or
officer against such expenses to the extent that he has been successful on the
merits or otherwise in defense of any such litigation or other proceeding.  The
Bylaws also provide that the right to indemnification includes the right to be
paid expenses incurred in defending any proceeding in advance of its final
disposition; provided, however, that such advance payment will only be made
upon the delivery to MOC of an undertaking, by or on behalf of the director or
officer, to repay all amounts so advanced if it is ultimately determined that
such director or officer is not entitled to indemnification.

         MOC's Certificate of Incorporation provides that the personal
liability of a director of the corporation shall be limited to the fullest
extent permitted by the DGCL.  Pursuant to Section 102(b) (7) of the DGCL,
Article Sixth of MOC's Certificate of Incorporation eliminates the personal
liability of a director to the corporation or its stockholders for monetary
damages for breach of fiduciary duty as a director, except for liabilities
arising (i) from any breach of the director's duty of loyalty to the
corporation or its stockholders, (ii) from acts or omissions not in good faith
or which involve intentional misconduct or a knowing violation of law, (iii)
under Section 174 of the DGCL or (iv) from any transaction from which the
director derived an improper personal benefit.

         The above discussion of MOC's Bylaws and Certificate of Incorporation
is not intended to be exhaustive and is respectively qualified in its entirety
by such documents.





                                      II-2
<PAGE>   26
         ITEM 16.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

(a)       Exhibits
<TABLE>
         <S>           <C>
           *4.1   --   Form of Senior Indenture among Mesa Operating Co., MESA Inc. and Bankers Trust Company, as
                       trustee.
                       
           *4.2   --   Form of Subordinated Indenture among Mesa Operating Co., MESA Inc. and Bankers Trust Company,
                       as trustee.
                       
             *5   --   Opinion of Baker & Botts, L.L.P.
                       
             12   --   Computation of Ratio of Earnings to Fixed Charges.
                       
           23.1   --   Consent of Independent Public Accountants.
                       
          *23.3   --   Consent of Baker & Botts, L.L.P. (included in Exhibit 5 to this Registration Statement).
                       
             24   --   Powers of Attorney of directors and officers of MESA Inc. (included on signature pages to this
                       Registration Statement).
                       
          *26.1   --   Form T-1 Statement of Eligibility and Qualification under the Trust Indenture Act of 1939 of
                       Bankers Trust Company relating to the Senior Indenture.
                       
          *26.2   --   Form T- I Statement of Eligibility and Qualification under the Trust Indenture Act of 1939 of
                       Bankers Trust Company relating to the Subordinated Indenture.
</TABLE>               

         * To be filed by amendment.

ITEM 17.  UNDERTAKINGS.

(a)      The undersigned registrant hereby undertakes:

         (1)     To file, during any period in which offers or sales are being
                 made, a post-effective amendment to this Registration
                 Statement:

                 (i)      To include any prospectus required by section
                          10(a)(3) of the Securities Act of 1933;

                 (ii)     To reflect in the prospectus any facts or events
                          arising after the effective date of the Registration
                          Statement (or the most recent post-effective
                          amendment thereof) which, individually or in the
                          aggregate, represent a fundamental change in the
                          information set forth in the Registration Statement.
                          Notwithstanding the foregoing, any increase or
                          decrease in volume of securities offered (if the
                          total dollar value of securities offered would not
                          exceed that which was registered) and any deviation
                          from the low or high end of the estimated maximum
                          offering range may be reflected in the form of
                          prospectus filed with the Commission pursuant to Rule
                          424(b) of the Securities Act if, in the aggregate,
                          the changes in volume and price represent no more
                          than a 20% change in the maximum aggregate offering
                          price set forth in the "Calculation of Registration
                          Fee" table in the effective Registration Statement;

                 (iii)    To include any material information with respect to
                          the plan of distribution not previously disclosed in
                          the Registration Statement or any material change to
                          such information in the Registration Statement;

                 Provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do
                 not apply if the information required to be included in a
                 post-effective amendment by those paragraphs is contained in
                 periodic reports





                                      II-3
<PAGE>   27
                 filed by the registrant pursuant to section 13 or section
                 15(d) of the Securities Exchange Act of 1934 that are
                 incorporated by reference in the Registration Statement.

         (2)     That, for the purpose of determining any liability under the
                 Securities Act of 1933, each such post- effective amendment
                 shall be deemed to be a new registration statement relating to
                 the securities offered therein, and the offering of such
                 securities at that time shall be deemed to be the initial bona
                 fide offering thereof.

         (3)     To remove from registration by means of a post-effective
                 amendment any of the securities being registered which remain
                 unsold at the termination of the offering.

(b)      The undersigned registrant hereby undertakes that, for purposes of
         determining any liability under the Securities Act of 1933, each
         filing of the registrant's annual report pursuant to section 13(a) or
         section 15(d) of the Securities Exchange Act of 1934 (and, where
         applicable, each filing of an employee benefit plan's annual report
         pursuant to section 15(d) of the Securities Exchange Act of 1934) that
         is incorporated by reference in the Registration Statement shall be
         deemed to be a new registration statement relating to the securities
         offered therein, and the offering of such securities at that time
         shall be deemed to be the initial bona fide offering thereof.

(c)      Insofar as indemnification for liabilities arising under the
         Securities Act of 1933 may be permitted to directors, officers and
         controlling persons of the registrant pursuant to the foregoing
         provisions, or otherwise, the registrant has been advised that in the
         opinion of the Securities and Exchange Commission such indemnification
         is against public policy as expressed in the Act and is, therefore,
         unenforceable.  In the event that a claim for indemnification against
         such liabilities (other than the payment by the registrant of expenses
         incurred or paid by a director, officer or controlling person of the
         registrant in the successful defense of any action, suit or
         proceeding) is asserted by such director, officer or controlling
         person in connection with the securities being registered, the
         registrant will, unless in the opinion of its counsel the matter has
         been settled by controlling precedent, submit to a court of
         appropriate jurisdiction the question whether such indemnification by
         it is against public policy as expressed in the Act and will be
         governed by the final adjudication of such issue.

         The undersigned registrant hereby undertakes to file an application
for the purpose of determining the eligibility of the trustee to act under
subsection (a) of Section 310 of the Trust Indenture Act ("Act") in accordance
with the rules and regulations prescribed by the Commission under Section 305
(b) (2) of the Act.





                                      II-4
<PAGE>   28
                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets
all of the requirements for filing on Form S-3 and has duly caused this
Registration Statement to be signed on its behalf by the undersigned, thereunto
duly authorized in the City of Dallas, State of Texas, on the 27th day of
January, 1997.

                                  MESA Inc.


                                  By:      /s/ Stephen K. Gardner               
                                     -------------------------------------------
                                           Stephen K. Gardner
                                           Senior Vice President and Chief
                                           Financial Officer

                                POWER OF ATTORNEY

         The undersigned directors and executive officers of MESA Inc. hereby
constitute and appoint Stephen K. Gardner and M. Garrett Smith, and each of
them, with full power to act without the other and with full power of
substitution and resubstitution, our true and lawful attorneys-in-fact with
full power to execute in our name and behalf in the capacities indicated below
any and all amendments (including post-effective amendments and amendments
thereto) to this Registration Statement and to file the same, with all exhibits
thereto and other documents in connection therewith with the Securities and
Exchange Commission and hereby ratify and confirm all that such attorneys-in-
fact, or either of them, or their substitutes shall lawfully do or cause to be
done by virtue hereof.

         Pursuant to the requirements of the Securities Act of 1933, this
registration statement or amendment has been signed by the following persons in
the capacities and on the date indicated.

<TABLE>
<CAPTION>
Signature                        Title                                              Date
- ---------                        -----                                              ----
<S>                              <C>                                                <C>
/s/ I. Jon Brumley               Chairman of the Board of Directors, Chief          January 27, 1997
- --------------------------       Executive Officer and President                                                                   
I. Jon Brumley                   

/s/ Stephen K. Gardner           Senior Vice President and Chief Financial Officer  January 27, 1997
- --------------------------       (Principal Financial Officer)                                                                   
Stephen K. Gardner               

/s/ Wayne A. Stoerner            Controller (Principal Accounting Officer)          January 27, 1997
- --------------------------                                                                          
Wayne A. Stoerner

/s/ John S. Herrington           Director                                           January 27, 1997
- --------------------------                                                                          
John S. Herrington

/s/ Kenneth A. Hersh             Director                                           January 27, 1997
- --------------------------                                                                          
Kenneth A. Hersh

/s/ Boone Pickens                Director                                           January 27, 1997
- --------------------------                                                                          
Boone Pickens

/s/ Richard E. Rainwater         Director                                           January 27, 1997
- --------------------------                                                                          
Richard E. Rainwater
                                                                                                      
/s/ Philip B. Smith              Director                                           January 27, 1997  
- --------------------------
Philip B. Smith

/s/ Robert L. Stillwell          Director                                           January 27, 1997
- --------------------------                                                                          
Robert L. Stillwell

</TABLE>




                                      II-5
<PAGE>   29
                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets
all of the requirements for filing on Form S-3 and has duly caused this
Registration Statement to be signed on its behalf by the undersigned, thereunto
duly authorized in the City of Dallas, State of Texas, on the 27th day of
January, 1997.

                                  MESA OPERATING CO.



                                  By:        /s/ Stephen K. Gardner           
                                     -----------------------------------------
                                           Stephen K. Gardner
                                           Senior Vice President and Chief 
                                           Financial Officer



                               POWER OF ATTORNEY

         The undersigned directors and executive officers of Mesa Operating Co.
hereby constitute and appoint Stephen K.  Gardner and M. Garrett Smith. and
each of them, with full power to act without the other and with full power of
substitution and resubstitution, our true and lawful attorneys-in-fact with
full power to execute in our name and behalf in the capacities indicated below
any and all amendments (including posteffective amendments and amendments
thereto) to this Registration Statement and to file the same, with all exhibits
thereto and other documents in connection therewith with the Securities and
Exchange Commission and hereby ratify and confirm all that such
attorneys-in-fact, or either of them, or their substitutes shall lawfully do or
cause to be done by virtue hereof.

         Pursuant to the requirements of the Securities Act of 1933, this
registration statement or amendment has been signed by the following persons in
the capacities and on the date indicated.

<TABLE>
<CAPTION>
SIGNATURE                   TITLE                              DATE
- ---------                   -----                              ----
<S>                         <C>                               <C>
/s/ I. Jon Brumley          Chairman of the Board of           January 27, 1997
- --------------------------  Directors, Chief Executive Officer                 
I. Jon Brumley              and President                     
                                                              

/s/ Dennis E. Fagerstone    Director, Senior Vice President    January 27, 1997
- --------------------------  and Chief Operating Officer                                                   
Dennis E. Fagerstone        

/s/ Stephen K. Gardner      Director, Senior Vice President    January 27, 1997
- --------------------------  and Chief Financial Officer                        
Stephen K. Gardner          (Principal Financial Officer)
                                                         

/s/ Wayne A. Stoerner       Controller (Principal Accounting   January 27, 1997
- --------------------------  Officer)                                                   
Wayne A. Stoerner           

</TABLE>





                                      II-6

<PAGE>   30
                                EXHIBIT INDEX


<TABLE>
         EXHIBIT
         NUMBER                   DESCRIPTION
         ------                   -----------
         <S>              <C>
           *4.1   --      Form of Senior Indenture among Mesa Operating Co., MESA Inc. and Bankers Trust Company, as
                          trustee.
                    
           *4.2   --      Form of Subordinated Indenture among Mesa Operating Co., MESA Inc. and Bankers Trust Company,
                          as trustee.
                    
             *5   --      Opinion of Baker & Botts, L.L.P.
                    
             12   --      Computation of Ratio of Earnings to Fixed Charges.
                    
           23.1   --      Consent of Independent Public Accountants.
                    
          *23.3   --      Consent of Baker & Botts, L.L.P. (included in Exhibit 5 to this Registration Statement).
                    
             24   --      Powers of Attorney of directors and officers of MESA Inc. (included on signature pages to this
                          Registration Statement).
                    
          *26.1   --      Form T-1 Statement of Eligibility and Qualification under the Trust Indenture Act of 1939 of
                          Bankers Trust Company relating to the Senior Indenture.
                    
          *26.2   --      Form T- I Statement of Eligibility and Qualification under the Trust Indenture Act of 1939 of
                          Bankers Trust Company relating to the Subordinated Indenture.
</TABLE>

<PAGE>   1
                                                                      EXHIBIT 12

                                   MESA INC.
               COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
                                 (IN THOUSANDS)

         The following computations of the ratio of earnings to fixed charges
for the nine months ended September 30, 1996 and for the years ended December
31, 1995, 1994, 1993, 1992 and 1991 represent the actual results of Mesa's
operations for those periods.


<TABLE>
<CAPTION>
                                                                           Year Ended December 31,                      
                               Nine Months Ended   -------------------------------------------------------------------
                               September 30, 1996     1995         1994          1993           1992          1991    
                               ------------------  ---------    ---------      ----------    ---------      --------- 
 <S>                                  <C>          <C>          <C>            <C>           <C>            <C>
 EARNINGS:
 Net loss                             $ (67,308)   $ (57,568)   $ (83,353)     $ (102,448)   $ (89,232)     $ (79,163)
 ADJUSTMENTS:

 Loss on investment
 accounted for under the                     --           --           --              --           --             --
 equity method

 Minority interest in loss                   --           --           (3)         (4,318)      (3,854)        (3,419)

 Interest expense                        99,697      148,630      144,757         142,002      143,392        150,770
                                      ---------    ---------    ---------      ----------    ---------      ---------
 Total earnings                       $  32,389    $  91,062    $  61,401      $   35,236    $  50,306      $  68,188
                                      =========    =========    =========      ==========    =========      =========

 Fixed charges
    Interest capitalized                    133          908          104           2,884        2,365             --

 Interest expense                        99,697      148,630      144,757         142,002      143,392        150,770
                                      ---------    ---------    ---------      ----------    ---------      ---------

 Total fixed charges                     99,830      149,538      144,861         144,886      145,757        150,770
                                      =========    =========    =========      ==========    =========      =========
 Ratio of earnings to fixed
 charges                                     (a)          (a)          (a)             (a)          (a)            (a)

 Amount by which fixed
 charges exceed earnings              $  67,441    $  58,476    $  83,460        $109,650     $ 95,451       $ 82,582
                                      =========    =========    =========      ==========    =========      =========
</TABLE>


(a)  Earnings were not adequate to cover fixed charges in the indicated
     periods.






<PAGE>   1

                                                                    EXHIBIT 23.1

                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


         As independent public accountants, we hereby consent to the
incorporation by reference in this registration statement, dated January 27,
1997, of our report on the financial statements of MESA, Inc. as of December
31, 1995 and 1994, and for each of the three years in the period ended December
31, 1995, and to all references to our Firm included in this registration
statement.


                                                             ARTHUR ANDERSEN LLP




Dallas, Texas
January 27, 1997



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