CAIRN ENERGY USA, INC.
                             1993 STOCK OPTION PLAN
                        INCENTIVE STOCK OPTION AGREEMENT


         THIS  AGREEMENT  is made and  entered  into this day     of     , 199 ,
between Cairn  Energy USA, Inc., a Delaware corporation (the "Corporation"), and
                     (the "Holder") in connection with the grant of an Incentive
Option  (defined  below) under the Cairn Energy USA, Inc. 1993 Stock Option Plan
(the "Plan"), as amended.


                              W I T N E S S E T H:

         WHEREAS,  the Holder  is  employed  by the  Corporation or  one of  its
Affiliates (defined below) in a key position; and

         WHEREAS,  the Corporation  desires to encourage the Holder to own Stock
(defined  below) and to give him added incentive to advance the interests of the
Corporation through the Plan; and

         WHEREAS,  the Corporation adopted the Plan, as approved and ratified by
stockholders,  effective April 8, 1993, and subsequently  adopted  amendments to
the Plan; and

         WHEREAS,  on , 19 (the "Date of Grant"),  the  Corporation  granted the
Holder an Incentive Option to purchase shares of Stock of the Corporation  under
terms and conditions established by the Board of Directors (defined below);

         NOW, THEREFORE,  in consideration of these premises,  the parties agree
that the following  shall  constitute the Agreement  between the Corporation and
the Holder:

         1.       DEFINITIONS.  For purposes  of this  Agreement,  defined terms
shall have the meanings given to them by the Plan except as specified below:

         1.1  "AFFILIATE"  shall  mean  (a)  any  corporation,  other  than  the
Corporation, in an unbroken chain of corporations ending with the Corporation if
each of the  corporations,  other than the  Corporation,  owns stock  possessing
fifty percent (50%) or more of the total combined voting power of all classes of
stock in one of the other  corporations  in such chain and (b) any  corporation,
other than the Corporation,  in an unbroken chain of corporations beginning with
the Corporation if each of the corporations,  other than the last corporation in
the unbroken  chain,  owns stock  possessing  fifty percent (50%) or more of the
total  combined  voting  power  of all  classes  of  stock  in one of the  other
corporations in such chain.



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                                                         1





         1.2 "AGREEMENT" shall mean this document as executed by the Corporation
and the Holder, and as it may be subsequently amended.

         1.3 "EXCHANGE ACT" shall mean the  Securities  Exchange Act of 1934, as
amended, or any similar or superseding statute or statutes.

         1.4  "INCENTIVE  OPTION" and "OPTION" shall mean a stock option granted
pursuant to this  Agreement  that is intended  to satisfy  the  requirements  of
section 422 of the Code.

         1.5 "SECURITIES ACT" shall mean the Securities Act of 1933, as amended,
or any similar or superseding statute or statutes.

         2. GRANT OF INCENTIVE  OPTION.  Subject to the terms and conditions set
forth in this  Agreement,  the  Corporation  grants to the  Holder an  Incentive
Option to purchase from the Corporation  during the period ending ten (10) years
from the Date of Grant  shares of Stock at a price of $ per  share,  subject  to
adjustment,  if any,  as  provided  in this  Agreement.  In no event  shall  the
exercise  price per share of this Option be less than the greater of (a) the par
value per share of Stock or (b) 100% of the Fair Market Value per share of Stock
on the date of grant of this Option.

         This  Incentive  Option is  exercisable  with  respect to the shares of
Stock indicated above on or after the following dates:

    -----------------             --------------------shares of Stock
    -----------------             --------------------additional shares of Stock
    -----------------             --------------------additional shares of Stock

In no event shall the Option be  exercisable  within the first six months of its
Date of Grant. In addition,  the number of shares  exercisable under this Option
shall be reduced to the extent necessary so that the sum of:

         (a)      the aggregate  Fair Market Value of shares of Stock subject to
                  this  Incentive  Option  that first  become  purchasable  in a
                  calendar year under this Incentive Option, and

         (b)      the aggregate Fair Market Value of shares of Stock or stock of
                  any  Affiliate  (or a  predecessor  of the  Corporation  or an
                  Affiliate) subject to any other incentive stock option (within
                  the meaning of section 422 of the Code) of the  Corporation or
                  its  Affiliates  (or a  predecessor  corporation  of any  such
                  corporation), that first become purchasable in a calendar year
                  under such incentive stock option

does not (with  respect to the Holder)  exceed  $100,000,  with such Fair Market
Value to be  determined  as of the date  this  Incentive  Option  or such  other
incentive stock option is granted.



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         For purposes of this Paragraph,  "predecessor  corporation" means (i) a
corporation that was a party to a transaction described in section 425(a) of the
Code (or that would be so described if a substitution  or assumption  under such
section had been effected) with the Corporation,  (ii) a corporation that at the
time the new  incentive  stock option  (within the meaning of section 422 of the
Code)  is  granted,  is  an  Affiliate  of  the  Corporation  or  a  predecessor
corporation of any such corporations,  or (iii) a predecessor corporation of any
such corporations.

         3.       NOTICE OF EXERCISE.  This Incentive Option may be exercised in
whole or in part,  from time to time, in accordance with PARAGRAPH 2, by written
notice to the  Corporation  at the  address  provided in this  Agreement,  which
notice shall:

                  (a) specify the number of whole shares of Stock to be 
purchased and the exercise price to be paid for such shares;

                  (b) if the person  exercising this Incentive Option is not the
Holder  himself,  contain or be  accompanied  by  evidence  satisfactory  to the
Committee of such person's right to exercise this Incentive Option; and

                  (c) be accompanied by payment in full of the purchase price in
the  form  of  cash,  a  certified  or  cashier's  check  to  the  order  of the
Corporation, or a wire transfer of immediately available funds.

         This  Incentive  Option may be exercised  only in  increments  at least
equal to the lesser of one  hundred  (100)  shares or ten  percent  (10%) of the
number of whole shares as to which it is exercisable.

                  4.  INVESTMENT  LETTER.  The Holder  agrees that the shares of
Stock  acquired on exercise of this  Incentive  Option shall be acquired for his
own  account  for  investment  only  and not with a view to,  or for  resale  in
connection  with, any distribution or public offering thereof within the meaning
of the Securities Act or other  applicable  securities laws. If the Committee so
determines, any Stock certificates issued upon exercise of this Incentive Option
shall bear a legend to the effect  that the shares  have been so  acquired.  The
Corporation  may,  but in no event  shall be required  to, bear any  expenses of
complying with the Securities Act, other applicable securities laws or the rules
and  regulations  of  any  national  securities  exchange  or  other  regulatory
authority in connection with the registration,  qualification,  or transfer,  as
the case may be, of this  Incentive  Option or any shares of Stock acquired upon
the exercise thereof.  The foregoing  restrictions on the transfer of the shares
of Stock shall be inoperative if (a) the Corporation  previously shall have been
furnished  with an opinion of  counsel,  satisfactory  to it, to the effect that
such transfer will not require  registration  under the  Securities Act or other
applicable  securities  laws or (b) the  shares  of Stock  shall  have been duly
registered in compliance with the Securities Act and other applicable securities
laws.

         5.    TRANSFER AND EXERCISE OF INCENTIVE OPTION.  This Incentive Option
shall  not be  transferable  except  by  will  or by the  laws  of  descent  and
distribution or pursuant to a qualified  domestic  relations order as defined in
the Code or Title I of the Employee Retirement Income

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Security Act  ("ERISA") or the rules  thereunder.  No  assignment or transfer of
this Incentive Option, whether voluntary or involuntary,  by operation of law or
otherwise,  except a transfer by will or by the laws of descent or  distribution
or pursuant to a qualified  domestic  relations  order as defined in the Code or
Title  I of  ERISA  or the  rules  thereunder,  shall  vest in the  assignee  or
transferee any interest or right whatsoever in this Incentive Option.

         During the Holder's  lifetime,  this Incentive  Option may be exercised
only by him,  his  guardian or legal  representative  or the  recipient  of this
Incentive Option pursuant to a qualified  domestic relations order as defined in
the Code or Title I of ERISA or the rules thereunder.

         6. STATUS OF HOLDER.  The Holder shall not be deemed a  stockholder  of
the  Corporation  with  respect  to any of the  shares of Stock  subject to this
Incentive  Option,  except  to the  extent  that  such  shares  shall  have been
purchased and transferred to him. The Corporation shall not be required to issue
or transfer any certificates for shares of Stock purchased upon exercise of this
Incentive  Option until all  applicable  requirements  of law have been complied
with and such shares shall have been duly listed on any  securities  exchange on
which the Stock may then be listed.

         7. NO EFFECT ON CAPITAL  STRUCTURE.  This  Incentive  Option  shall not
affect the right of the Corporation or any Affiliate to reclassify, recapitalize
or  otherwise  change its capital or debt  structure  or to merge,  consolidate,
convey any or all of its  assets,  dissolve,  liquidate,  windup,  or  otherwise
reorganize.

         8.       EXPIRATION OF INCENTIVE OPTION UPON TERMINATION OF EMPLOYMENT.

         Except as  otherwise  specifically  provided  in this  Agreement,  if a
Holder ceases to be an Eligible  Individual,  the portion, if any, of the Option
that is exercisable  but remains  unexercised on the date the Holder stops being
an Eligible Individual shall terminate twenty-four (24) months after such Holder
ceases to be an Eligible Individual.

         The  portion  of the  Option  that is not  exercisable  on the date the
Holder ceases to be an Eligible  Individual  shall terminate and be forfeited to
the  Corporation  on the date of such  cessation.  Notwithstanding  the previous
sentence,  if (i) a Change in  Control of the  Corporation  occurs  and,  within
twenty-four months from the date of the Change in Control of the Corporation,  a
Holder ceases to be an Eligible  Individual  either because (A) the  Corporation
terminates the Holder's  employment with the Corporation for a reason other than
Due Cause or (B) the Holder  terminates his employment  with the Corporation due
to a Severance  Termination by the Holder of the Holder's Employment  Agreement,
or (ii) a Holder ceases to be an Eligible  Individual  by reason of death,  then
any Options  held by such Holder shall be  exercisable  in full on the date such
Holder ceases to be an Eligible Individual,  and no portion of an Option held by
such Holder shall  terminate or forfeit on the date such Holder  ceases to be an
Eligible  Individual.  The  provisions of this paragraph of PARAGRAPH 8 shall be
applied  before  the  provisions  of  the  immediately  preceding  paragraph  of
PARAGRAPH 8.



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         9.       ADJUSTMENTS UPON CHANGES IN CAPITALIZATION, MERGER, ETC.   
Notwithstanding  any  other  provision  of this  Agreement,  in the event of any
change in the number of outstanding shares of Stock

         (a)      effected  without receipt of consideration by the Corporation,
                  by reason of a stock dividend, or split, combination, exchange
                  of shares or other recapitalization,  merger, or otherwise, in
                  which the Corporation is the surviving corporation, or

         (b)      by reason of a spin-off of a part of the Corporation into a 
                  separate entity, or assumptions and conversions of outstanding
                  grants due to an acquisition by the Corporation of a separate 
                  entity,

(1) the aggregate  number and class of shares subject to this  Incentive  Option
and (2) the  exercise  price of this  Incentive  Option  shall be  automatically
adjusted to accurately and equitably reflect the effect of such changes.  In the
event of a dispute  concerning  such  adjustment,  the Committee shall have full
discretion  to  resolve  the  dispute.  The  number  of shares  subject  to this
Incentive  Option shall be  automatically  reduced by any fraction which results
from any adjustment made pursuant to this Paragraph.

         In the event of:

(a)  a dissolution or liquidation of the Corporation,

(b)  a merger or consolidation  (other than a merger effecting a reincorporation
     of the  Corporation in another state or any other merger or a consolidation
     in  which  the   stockholders  of  the  surviving   corporation  and  their
     proportionate  interests in the surviving corporation immediately after the
     merger or consolidation are substantially  identical to the stockholders of
     the  Corporation  and  their  proportionate  interests  in the  Corporation
     immediately  prior to the merger or consolidation) in which the Corporation
     is not the  surviving  corporation  (or survives  only as a  subsidiary  of
     another  corporation  in a  transaction  in which the  stockholders  of the
     parent of the Corporation and their  proportionate  interests in the parent
     immediately  after the transaction are not  substantially  identical to the
     stockholders of the Corporation and their  proportionate  interests therein
     immediately prior to the transaction;  provided that the Board of Directors
     may at any  time  prior  to  such a  merger  or  consolidation  provide  by
     resolution that the foregoing  provisions of this  parenthetical  shall not
     apply if a majority of the board of  directors  of such parent  immediately
     after the transaction consists of individuals who constituted a majority of
     the Board of Directors immediately prior to the transaction), or

(c)  a transaction in which any person (other than Cairn Energy PLC) becomes the
     owner of 50% or more of the total  combined  voting power of all classes of
     stock of the Corporation (provided, however, that the Board of Directors


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     may at any time prior to such  transaction  provide by resolution that this
     Subparagraph  (c) shall not apply if such acquiring person is a corporation
     and a  majority  of the board of  directors  of the  acquiring  corporation
     immediately after the transaction consists of individuals who constituted a
     majority of the Board of Directors  immediately prior to the acquisition of
     such 50% or more total combined voting power)

the Board of Directors  may, at its election,  as of the effective  time of such
transaction, either (1) change the number and kind of shares of stock (including
substitution of shares of another  corporation) and exercise price in the manner
it deems appropriate, provided, however, that in no event may any change be made
under this Paragraph which would constitute a "modification"  within the meaning
of section  425(h)(3) of the Code, or (2) purchase the Option from the Holder by
tendering  cash equal to the Fair Market Value of the Stock  represented  by the
Option  less the  exercise  price of the  Option  specified  in this  Agreement,
without  regard to the  determination  as to the  periods  and  installments  of
exercisability made pursuant to this Agreement,  if (and only if) the Option has
not at that time expired or been terminated.

         10.    COMMITTEE AUTHORITY.  Any question concerning the interpretation
     of  this  Agreement,  any  adjustments  required  to  be  made  under  this
     Agreement,  and any controversy  which may arise under this Agreement shall
     be determined by the Committee in its sole discretion.

         11.  NOTICE  OF  DISQUALIFYING  DISPOSITION.  In  order to  enable  the
Corporation  to avail  itself of any  income  tax  deduction  to which it may be
entitled,  the Holder shall notify the  Corporation  of his intent to dispose of
any of the shares of Stock  purchased  pursuant to this Incentive  Option within
two (2) years  from the date of the grant of the  Incentive  Option  and one (1)
year from the date of exercise of the Incentive Option,  and promptly after such
disposition  the Holder shall notify the  Corporation of the number of shares of
Stock disposed of, the dates of acquisition and disposition of such shares,  and
the  consideration,  if any,  received  on  such  disposition.  Nothing  in this
Paragraph,  however,  shall  give the  Holder  any right to dispose of shares of
Stock in a manner that is  inconsistent  with any  provision  of the Plan or any
Paragraph of this  Agreement.  If in connection  with any such  disposition  the
Corporation  becomes liable for  withholding  taxes and has no amounts owing the
Holder with which to  discharge  its  withholding  obligation,  the Holder shall
provide the  Corporation  with the amount needed to discharge the  Corporation's
withholding obligation and shall indemnify the Corporation against any penalties
it may  incur  through  its  inability  to apply  amounts  owing  the  Holder in
discharge of its withholding obligation.

         12. INCENTIVE OPTION  QUALIFICATION.  This Incentive Option is intended
to qualify as an "incentive  stock option"  within the meaning of section 422 of
the  Internal  Revenue  Code of 1986,  as  amended,  and shall be so  construed;
provided,  however,  that nothing in this  Agreement  shall be  interpreted as a
representation,  guarantee or other  undertaking on the part of the  Corporation
that this  Incentive  Option is or will be determined to be an "incentive  stock
option" within such section or any other section of the Internal Revenue Code.



LABDAL:49156.2   15467-6
                                                         6


         13. PLAN  CONTROLS.  The terms of this  Agreement  are  governed by the
terms of the Plan,  a copy of which is  attached as Exhibit A and made a part of
this Agreement as if fully set forth in this  Agreement,  and in the case of any
inconsistency between the terms of this Agreement and the terms of the Plan, the
terms of the Plan shall control.

         14. NOTICE. Whenever any notice is required or permitted under the Plan
or this  Agreement,  such notice must be in writing  and  personally  delivered,
telecopied (if confirmed),  or sent by mail. Any notice required or permitted to
be delivered under the Plan or this Agreement shall be deemed to be delivered on
the date which it is personally delivered, or, whether actually received or not,
on the third  business  day after it is  deposited  in the United  States  mail,
certified  or  registered,  postage  prepaid,  addressed to the person who is to
receive it at the address which such person has previously  specified by written
notice  delivered in accordance with this  Paragraph.  The Corporation or Holder
may change,  at any time and from time to time, by written  notice to the other,
the  address  previously  specified  for  receiving  notices.  Until  changed in
accordance  with this  paragraph,  the  Corporation and the Holder specify their
respective addresses as set forth below:

         Corporation:         Cairn Energy USA, Inc.
                              8115 Preston Road, Suite 500
                              Dallas, Texas 75225
                              Attention: Secretary

         Holder:              -----------------------
                              -----------------------
                              -----------------------

         15. INFORMATION CONFIDENTIAL. As partial consideration for the granting
of this Incentive  Option,  the Holder agrees that he will keep confidential all
information  and knowledge  that he has relating to the manner and amount of his
participation  in the Plan;  provided,  however,  that such  information  may be
disclosed  as required  by law and may be given in  confidence  to the  Holder's
spouse, tax and financial advisors,  or to a financial institution to the extent
that such information is necessary to secure a loan.


         IN WITNESS  WHEREOF,  the  Corporation  has caused this Agreement to be
executed  and the Holder has executed  this  Agreement on the day and year first
above written.

                                          "CORPORATION"

                                           CAIRN ENERGY USA, INC.

                                       By:
                                          -----------------------
                                          -----------------------

                                  "HOLDER"
                                          -----------------------
                                          -----------------------

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