EXHIBIT 10.3

                              AMENDED AND RESTATED
                       STOCK PLEDGE AND SECURITY AGREEMENT


          THIS AMENDED AND RESTATED  STOCK PLEDGE AND SECURITY  AGREEMENT  (this
"Agreement")  is dated and  effective as of September  30, 2004 by Carrizo Oil &
Gas, Inc., a Texas corporation (hereinafter referred to as "Grantor"),  in favor
of Hibernia  National Bank, a national  banking  association  (the "Agent"),  as
Agent for itself and each of the financial  institutions  (the "Lenders")  which
now or hereafter  become a party to that certain  Credit  Agreement  (as defined
below), to secure the Indebtedness (as defined below) of the Grantor.

                                    Recitals

          A. The Grantor, CCBM, Inc., a Delaware corporation, the Agent, and the
Lenders are the parties to that  certain  Second  Amended  and  Restated  Credit
Agreement of even date herewith.

          B. Pursuant to the Second Amended and Restated Credit  Agreement,  the
Grantor has agreed to enter into and execute this Agreement.

          C. This  Agreement  constitutes  a  renewal  and  restatement  of that
certain  Stock  Pledge and Security  Agreement  dated May 24, 2002 by Grantor in
favor of Hibernia National Bank (the "Original  Pledge").  The security interest
created and perfected  pursuant to the Original  Pledge is renewed and extended,
without  impairment  by this  Agreement,  but the  terms and  conditions  of the
security  interest  shall  be as  stated  in  this  Agreement.  Novation  is not
intended.

                                    AGREEMENT

          NOW, THEREFORE,  in consideration of the premises, the Grantor and the
Agent (for the ratable  benefit of the  Lenders) do hereby amend and restate the
Original Pledge and agree and obligate themselves as follows:

          Section 1.  DEFINITIONS.  Any  capitalized  term defined in the Credit
Agreement  (as defined  below) and not otherwise  defined  herein shall have the
meaning given to such term in the Credit Agreement.  In addition,  the following
terms shall have the following meanings when used in this Agreement:

          AGREEMENT.  The term  "Agreement"  refers to this Amended and Restated
          Stock Pledge and Security Agreement as this agreement may be modified,
          restated, or amended in writing from time to time, and to any exhibits
          or attachments to this Agreement.

          CCBM. The term "CCBM" means CCBM,  Inc., a Delaware  corporation,  and
          its successors and assigns.




          COLLATERAL.  The term "Collateral" refers  individually,  collectively
          and  interchangeably  to the  Collateral  as more fully  described  in
          Section 2 (A) of this Agreement.

          CREDIT  AGREEMENT.  The term  "Credit  Agreement"  means that  certain
          Second Amended and Restated Credit Agreement of even dated herewith by
          and among Grantor,  CCBM, the Agent, and the Lenders,  as the same may
          hereafter be amended,  modified, and/or restated from time to time and
          in effect.

          GRANTOR.  The term  "Grantor"  means Carrizo Oil & Gas,  Inc., a Texas
          corporation, and its successors and assigns.

          INDEBTEDNESS.    The   term   "Indebtedness"    refers   individually,
          collectively  and  interchangeably  to  (i)  the  present  and  future
          indebtedness,  obligations,  and  liabilities of Grantor arising under
          the Credit  Agreement,  including the Facility Loans and the Notes, as
          well as any future renewals,  modifications,  or extensions to any one
          or more of the Facility  Loans and/or the Notes,  and (ii) all present
          and future  indebtedness,  obligations  and liabilities of Borrower to
          the Lenders,  or any  affiliate of any  Lenders,  arising  under or in
          connection   with  Rate   Management   Transactions   and/or   Hedging
          Agreements,  and (iii) all Reimbursement  Obligations.  This Agreement
          covers future advances.

          LENDERS.  The term "Lenders" refers  collectively to Hibernia National
          Bank, Union Bank of California,  N.A., and if applicable,  any bank or
          banks  that  become a  signatory  party  (as a Lender)  to the  Credit
          Agreement in the future, and their respective successors and assigns.

          SECURITYHOLDERS AGREEMENT. The term "Securityholders  Agreement" means
          that certain SECURITYHOLDERS  AGREEMENT,  dated as of June 23, 2003 by
          and among Pinnacle Gas Resources, Inc., a Delaware corporation , CCBM,
          Inc., a Delaware  corporation,  Rocky  Mountain  Gas,  Inc., a Wyoming
          corporation , each of the CSFB Parties (as defined  herein),  Peter G.
          Schoonmaker, a natural person , Gary Uhland, a natural person, Carrizo
          Oil & Gas, Inc., a Texas  corporation and U.S. Energy  Corporation,  a
          Delaware  corporation.  "CSFB  Parties"  means,  collectively,  DLJ MB
          Partners III GmbH & Co. KG, a limited company organized under the laws
          of Germany,  DLJ Offshore Partners III, C.V., a partnership  organized
          under the laws of the Netherland Antilles, DLJ Offshore Partners III1,
          C.V.,  a  partnership  organized  under  the  laws  of the  Netherland
          Antilles,  DLJ Offshore  Partners III2, C.V., a partnership  organized
          under the laws of the  Netherland  Antilles,  Millennium  Partners II,
          L.P., a Delaware  limited  partnership,  DLJ Merchant Banking Partners
          III, L.P., a Delaware limited partnership, and MBP III Plan Investors,
          L.P., a Delaware limited partnership.

          Section 2.  SECURITY  INTEREST.  (A) To secure  the full and  punctual
payment and  performance  of all present  and future  Indebtedness,  the Grantor
hereby  pledges,  pawns,  transfers  and  grants to the Agent  (for the  ratable
benefit of the  Lenders) a  continuing  security  interest  in and



                                       2


to all of the following  property of the Grantor,  whether now owned or existing
or hereafter acquired or arising (collectively the "Collateral"):

          1000 shares of the capital stock of CCBM  represented  by  Certificate
          No. 1, dated June 29, 2001, registered in the Grantor's name, together
          with any  additional  shares of stock  issued  by CCBM to the  Grantor
          hereafter as stock  dividends,  stock splits or  otherwise,  or shares
          received as a result of any merger or consolidation of CCBM, all cash,
          liquidation and other dividends now or hereafter declared thereon, all
          stock  redemption  payments  and all other monies due or to become due
          thereunder, all stock warrants, options, pre-emptive rights, rights of
          first refusal,  and other rights to subscribe to,  purchase or receive
          any  shares  of  common  stock or other  securities  now or  hereafter
          incident thereto or declared or granted in connection  therewith,  and
          all distributions (whether made in cash, instruments, income, or other
          property)  made or to be  made in  connection  therewith  or  incident
          thereto, and all proceeds of all or any of the foregoing,  in whatever
          form, and all proceeds of such proceeds.

          (B) The  security  interest is granted as security  only and shall not
subject  the Agent  and/or the  Lenders  to, or transfer or in any way affect or
modify,  any  obligation  or liability of the Grantor with respect to any of the
Collateral or any transaction in connection therewith.

          Section 3.  DELIVERY  OF  COLLATERAL.  The Agent  hereby  accepts  the
delivery  of the  Collateral  on behalf the  Lenders and on behalf of any future
transferee  of the  Indebtedness.  The Grantor  will  execute and deliver to the
Agent all  assignments,  endorsements,  powers  and other  documents  reasonably
requested  at any time and from  time to time by the Agent or the  Lenders  with
respect to the  Collateral and the rights and powers granted to the Agent or the
Lenders  hereunder,  and  will  deliver  to the  Agent  any  stock  certificates
representing  stock  dividends  on, or stock  splits of, any of the  Collateral,
together with a stock power fully executed in blank.

          Section 4. REPRESENTATIONS.  The Grantor has not performed any acts or
signed any  agreements  which might prevent the Agent from  enforcing any of the
terms  of  this  Agreement  or  which  would  limit  any of  them  in  any  such
enforcement.  No  security  agreement  or  similar  or  equivalent  document  or
instrument  covering all or any part of the  Collateral has been executed by the
Grantor and remains in effect.  No Collateral is in the possession of any Person
(other  than the  Grantor)  asserting  any claim  thereto or  security  interest
therein, except that the Agent or its designee may have possession of Collateral
as contemplated hereby. The Grantor further represents and warrants as follows:

          (a)  There are no outstanding options, warrants or similar rights with
               respect to the Collateral;

          (b)  The  Grantor  has the full  power and  authority  to grant to the
               Agent a valid and  enforceable  perfected and continuing  lien on
               and  security  interest  in  the  Collateral   pursuant  to  this
               Agreement;

          (c)  The  Collateral   delivered  to  the  Agent  is  fully  paid  and
               non-assessable,  duly and validly authorized and issued and, upon
               execution  hereof,  will be duly



                                       3


               and  validly   pledged  to  the  Agent  in  accordance  with  all
               provisions of applicable law;

          (d)  The  Grantor has good and  marketable  title to, and is the legal
               and registered  owner of, the  Collateral,  free and clear of all
               liens,  except for the security interest created pursuant to this
               Agreement;

          (e)  Upon  the  execution  and  delivery  of  this  Agreement  and the
               delivery  to the  Agent of the  Collateral,  the  Agent  (for the
               ratable   benefit  of  the  Lenders)   shall  have  a  valid  and
               enforceable  lien  on  and  security   interest  in  and  to  the
               Collateral;  such lien and security  interest shall  constitute a
               perfected  security interest in such Collateral,  superior to the
               rights  and  equitable  interests  of all  other  persons  in the
               Collateral;

          (f)  The execution,  delivery and performance of this Agreement by the
               Grantor  and the  granting  of a valid and  enforceable  lien and
               security  interest  in the  Collateral  will not (i)  violate any
               provision of any law, any judgment,  order, rule or regulation of
               any court,  arbitration panel, or other  governmental  authority,
               domestic or foreign,  or other person, (ii) violate any provision
               of  any  indenture,   agreement,   mortgage,  contract  or  other
               instrument to which the Grantor is a party or by which any of its
               properties, assets or revenues are bound, or be in conflict with,
               result in an  acceleration  of any  obligation  or a breach of or
               constitute  (with  notice  or lapse  of time or  both) a  default
               under, any such indenture, agreement, mortgage, contract or other
               instrument,  or (iii) result in the creation or imposition of any
               lien on any of the properties, assets or revenues of the Grantor,
               except those in favor of the Agent as provided herein.

          (g)  This  Agreement  has been  duly  executed  and  delivered  by the
               Grantor and constitutes the legal,  valid and binding  obligation
               of the  Grantor  enforceable  against it in  accordance  with its
               terms;

          (h)  No  registration  with or consent or approval of, or other action
               by, any  governmental  authority,  domestic or foreign,  or other
               person is required  (other than such  approvals or consents which
               may  have  been  obtained)  in  connection  with  the  execution,
               delivery and  performance  of this  Agreement and the granting of
               the valid  and  enforceable  lien and  security  interest  in the
               Collateral in favor of the Agent;

          (i)  The Collateral  constitutes  not less than 100% of the issued and
               outstanding stock of CCBM;

          (j)  The  Grantor  represents  and  warrants  that  until the  Agent's
               security  interest in the  Collateral is terminated by the Agent,
               that the Collateral  shall at all times  constitute not less than
               100% of the issued and  outstanding  stock of CCBM. To the extent
               necessary,  the  Grantor  agrees  that it shall  not


                                       4


               approve or  authorize  any  issuance of capital  stock by CCBM if
               such  issuance  would  reduce  the  Collateral   below  the  100%
               calculation mentioned in the preceding sentence;

          (k)  The Grantor represents and warrants that it is a corporation duly
               organized under the laws of its state of incorporation. As of the
               date hereof, Grantor's mailing address and the location of is its
               principal  place of  business  (if it only has one) or its  chief
               executive  office (if it has more than one place of  business) is
               at 14701 St. Mary's Lane, Suite 800, Houston,  TX 77079.  Grantor
               also  represents and warrants that it has not conducted  business
               under  any name  except  the name in which it has  executed  this
               Agreement, which is the exact name as it appears in the Grantor's
               organizational documents, as amended, as filed with the Grantor's
               jurisdiction  of  organization.  Grantor  represents and warrants
               that its Federal  employer  identification  number is 76-0415919.
               Grantor  agrees  that it will  notify  Agent  in  writing  should
               Grantor ever change its name, legal status, or change or obtain a
               new  Federal  employer  identification  number.  Grantor  further
               agrees to notify  Agent in  writing  of any  change in  Grantor's
               mailing  address or the location of Grantor's  principal  office;
               and

          (l)  The Grantor represents and warrants that it shall not execute any
               amendment to or  modification  of the  Securityholders  Agreement
               without first obtaining the prior written consent of Agent.

          Section 5. VOTING RIGHTS.  (A) So long as no Event of Default (as such
term is defined in the Credit  Agreement) shall have occurred and be continuing,
the Grantor  shall have the right,  from time to time,  to  exercise  voting and
other consensual rights to give approvals,  ratifications and waivers pertaining
to the  Collateral,  and the Agent upon  receiving  a written  request  from the
Grantor  accompanied  by a  certificate  stating  that no Event of  Default  has
occurred  will  deliver to the Grantor (or as specified  in such  request)  such
proxies, approvals,  ratifications,  waivers and other instruments pertaining to
the  Collateral as may be specified in such request and be in form and substance
satisfactory to the Agent.

          (B) Upon the  occurrence  and  during the  continuance  of an Event of
Default,  the Agent shall have the right, at the Agent's option, to exercise the
voting and other consensual rights to give approvals,  ratifications and waivers
and to take any other  action with respect to all the  Collateral  with the same
force and effect as if the Agent (for the ratable  benefit of the  Lenders)  was
the absolute and sole owner  thereof,  and the Grantor's  right to exercise such
voting and other  consensual  rights  shall,  at the Agent's  option,  cease and
become vested in the Agent.

          Section 6. REMEDIES UPON DEFAULT.  (A) Upon the  occurrence and during
the  continuance  of an Event of Default  (as such term is defined in the Credit
Agreement)  the Agent may  exercise  all  rights  of a secured  party  under the
Uniform Commercial Code-Secured Transactions and other applicable law (including
the Uniform  Commercial  Code as in effect  from time to time in any  applicable
jurisdiction)  and, in addition,  the Agent may,  without being required to give
any  notice,

                                       5


except as herein provided or as may be required by mandatory  provisions of law,
(i) transfer the whole or any part of the  Collateral  into the name of Agent or
its nominee(s); (ii) sell the Collateral or any part thereof at a broker's board
or on a securities exchange; or (iii) sell the Collateral or any part thereof at
public or private sale,  for cash,  upon credit or for future  delivery,  and at
such  price or prices as the Agent may deem  satisfactory.  The Agent may be the
purchaser of any or all of the Collateral so sold at any public sale (or, if the
Collateral is of a type customarily sold in a recognized  market or is of a type
which is the subject of widely  distributed  standard price  quotations,  at any
private sale). The Grantor will execute and deliver such documents and take such
other  action as the Agent deems  necessary  or advisable in order that any such
sale may be made in compliance with law. Upon any such sale the Agent shall have
the  right  to  deliver,  assign  and  transfer  to the  purchaser  thereof  the
Collateral so sold. Each purchaser at any such sale shall hold the Collateral so
sold to it  absolutely  and free  from any  claim or right of  whatsoever  kind,
including  any equity or right of redemption of the Grantor which may be waived,
and the Grantor,  to the extent permitted by law, hereby specifically waives all
rights of redemption,  stay or appraisal  which it has or may have under any law
now existing or hereafter adopted.  The Grantor agrees that ten (10) days' prior
written notice of the time and place of any sale or other  intended  disposition
of  any of the  Collateral  constitutes  "reasonable  notification"  within  the
meaning of Section  9-504(3) of the Uniform  Commercial  Code (or any  successor
provision from time to time in effect) except that shorter or no notice shall be
reasonable  as to any  Collateral  which is  perishable  or threatens to decline
speedily in value or is of a type customarily sold on a recognized  market.  The
notice (if any) of such sale shall (1) in case of a public sale,  state the time
and place fixed for such sale, and (2) in the case of a private sale,  state the
day after which such sale may be consummated. Any such public sale shall be held
at such time or times within ordinary business hours and at such place or places
as the Agent may fix in the notice of such sale. At any such sale the Collateral
may be sold in one lot as an entirety or in separate  parcels,  as the Agent may
determine.  The Agent shall not be obligated  to make any such sale  pursuant to
any such  notice.  The Agent may,  without  notice or  publication,  adjourn any
public or private  sale or cause the same to be  adjourned  from time to time by
announcement at the time and place fixed for the sale, and such sale may be made
at any time or place to which the same may be so adjourned.  In case of any sale
of all or any part of the  Collateral  on credit  or for  future  delivery,  the
Collateral  so sold may be retained by the Agent until the selling price is paid
by the purchaser thereof, but the Agent shall not incur any liability in case of
the failure of such purchaser to take up and pay for the Collateral so sold and,
in case of any such failure, such Collateral may again be sold upon like notice.

          (B) The  Agent,  instead  of  exercising  the  power  of  sale  herein
conferred  upon  it,  may  proceed  by a suit or suits  at law or in  equity  to
foreclose  the  security  interests  and sell  the  Collateral,  or any  portion
thereof,  under  a  judgment  or  decree  of a  court  or  courts  of  competent
jurisdiction.  For the purposes of Louisiana executory process  procedures,  the
Grantor does hereby  confess  judgment in favor of the Agent and the Lenders for
the full amount of the Indebtedness. The Grantor does by these presents consent,
agree and stipulate  that upon the occurrence of an Event of Default it shall be
lawful for the Agent,  and the Grantor does hereby authorize the Agent, to cause
all and  singular  the  Collateral  to be seized  and sold  under  executory  or
ordinary process, at the Agent's sole option, without appraisement, appraisement
being  hereby  expressly  waived,  as an entirety or in parcels as the Agent may
determine,  to the highest bidder, and otherwise exercise the rights, powers and
remedies afforded herein and under applicable Louisiana law. For the purposes

                                       6


of Louisiana executory process procedures, any and all declarations of fact made
by authentic  act before a Notary  Public in the presence of two  witnesses by a
person  declaring  that such  facts lie within his  knowledge  shall  constitute
authentic  evidence  of such facts for the  purpose of  executory  process.  The
Grantor hereby waives in favor of the Agent:  (a) the benefit of appraisement as
provided in Louisiana  Code of Civil  Procedure  Articles 2332,  2336,  2723 and
2724,  and all other laws  conferring  the same;  (b) the demand and three days'
delay accorded by Louisiana Code of Civil Procedure  Articles 2639 and 2721; (c)
the notice of seizure  required by Louisiana  Code of Civil  Procedure  Articles
2293 and 2721;  (d) the three days' delay  provided by  Louisiana  Code of Civil
Procedure Articles 2331 and 2722; and (e) the benefit of the other provisions of
Louisiana Code of Civil Procedure Articles 2331, 2722 and 2723, not specifically
mentioned above.

          (C) The  Grantor  recognizes  that the Agent may be unable to effect a
public sale of all or part of the  Collateral by reason of certain  prohibitions
contained  in the  Securities  Act of 1933,  as amended,  and  applicable  state
securities laws but may be compelled to resort to one or more private sales to a
restricted  group of  purchasers  who will be  obligated  to agree,  among other
things,  to acquire all or a part of the Collateral  for their own account,  for
investment,  and not with a view to the  distribution or resale thereof.  If the
Agent deems it advisable to do so for the  foregoing or for other  reasons,  the
Agent is authorized to limit the prospective  bidders on or purchasers of any of
the  Collateral  to such a restricted  group of  purchasers  and may cause to be
placed on  certificates  for any or all of the Collateral a legend to the effect
that such security has not been registered  under the Securities Act of 1933, as
amended,  and may not be disposed of in violation of the  provision of said act,
and to impose such other  limitations or conditions in connection  with any such
sale as the Agent deems  necessary or advisable in order to comply with said act
or any other securities or other laws. The Grantor  acknowledges and agrees that
any private  sale so made may be at prices and on other terms less  favorable to
the seller than if such  Collateral  were sold at public sale and that the Agent
has no  obligation to delay the sale of such  Collateral  for the period of time
necessary to permit the  registration  of such  Collateral for public sale under
any securities  laws. The Grantor agrees that a private sale or sales made under
the foregoing  circumstances shall be deemed to have been made in a commercially
reasonable  manner. If any consent,  approval,  or authorization of any federal,
state, municipal or other governmental department, agency or authority should be
necessary to effectuate any sale or other disposition of the Collateral,  or any
partial sale or other  disposition of the  Collateral,  the Grantor will execute
all  applications  and other  instruments as may be required in connection  with
securing any such consent,  approval or authorization and will otherwise use its
best  efforts to secure  same.  In addition,  if the  Collateral  is disposed of
pursuant to Rule 144, the Grantor  agrees to complete and execute a Form 144, or
comparable  successor  form, at the Agent's  request;  and the Grantor agrees to
provide  any  material  adverse   information  in  regard  to  the  current  and
prospective  operations  of any  corporation  whose stock  constitutes  all or a
portion of the  Collateral  of which the Grantor has knowledge and which has not
been publicly disclosed,  and the Grantor hereby acknowledges that the Grantor's
failure  to  provide  such  information  may  result in  criminal  and/or  civil
liability.

          (D) In  addition,  to the extent  permitted  by  applicable  law,  the
Grantor hereby  unconditionally  and irrevocably  authorizes and instructs CCBM,
upon the occurrence and  continuance of an Event of Default,  to transfer record
ownership  of the  Collateral  to the  Lenders.

                                       7


Notice of said  occurrence and  continuance of an Event of Default to CCBM shall
be the issuance of a written notification thereof by the Agent to CCBM.

          (E) Application of Proceeds. All payments received by the Agent and/or
the  Lenders  hereunder  shall be  applied  by the  Lenders  to  payment  of the
Indebtedness  in the  following  order unless a court of competent  jurisdiction
shall otherwise direct:

          (i)  FIRST, to payment of all costs and expenses of the Agent incurred
               in  connection   with  the  collection  and  enforcement  of  the
               Indebtedness or of any security interest granted to the Agent for
               the  benefit of the  Lenders in  connection  with any  collateral
               securing the Indebtedness;

          (ii) SECOND,   to  payment  of  that   portion  of  the   Indebtedness
               constituting  accrued and unpaid  interest and fees, to the Agent
               and the  Lenders  and their  affiliates  in  accordance  with the
               amount of such accrued and unpaid interest and fees owing to each
               of them;

          (iii)THIRD,  to payment of the principal  outstanding  under the Notes
               and any amount due by the Grantor to Lenders (or any affiliate of
               Lenders)  under  Rate  Management  Transactions  (to  the  extent
               constituting Indebtedness); and

          (iv) FOURTH, to payment of any remaining Indebtedness.

          (F) Notwithstanding  anything herein to the contrary,  the Grantor and
the Agent hereby  acknowledge and agree, among themselves and for the benefit of
Pinnacle  that (i) insofar and only insofar as the  Pinnacle  Shares (as defined
below)  are   concerned,   each   agrees  to  be  bound  by  the  terms  of  the
Securityholders  Agreement,  (ii) the Agent  shall  notify  (using the names and
addresses  of such  parties as provided  in Section  9.5 of the  Securityholders
Agreement)  Pinnacle  and  the  nonpledging   Shareholder  (as  defined  in  the
Securityholders  Agreement)  of the date,  time and location of any  foreclosure
upon pledged or encumbered Collateral at least 60 days prior to the foreclosure,
(iii)  that any  notice of  foreclosure  shall be  deemed  to be an  Involuntary
Transfer subject to Section 5.6 of the  Securityholders  Agreement,  and (iv) if
Pinnacle  elects to purchase the Pinnacle  shares held by Grantor (the "Pinnacle
Shares")  pursuant  to  Section  5.6  of  the  Securityholders   Agreement,  the
foreclosure  shall  not be held  and  the  Pinnacle  Shares  shall  be sold  and
delivered by the Agent and the Grantor to the Persons  entitled to purchase such
Pinnacle Shares under Section 5.6 of the Securityholders Agreement in accordance
with Section 5.6 of the Securityholders Agreement. If for any reason the pledged
Collateral  is  foreclosed   upon,  the  foreclosure   shall  be  considered  an
Involuntary  Transfer and the  provisions of Section 5.6 of the  Securityholders
Agreement shall govern.

          Section 7. LIMITATION ON DUTY.  Beyond the exercise of reasonable care
in the custody thereof, the Agent shall have no duty as to any Collateral in its
possession  or control or in the  possession or control of the Lenders or bailee
or any income  thereon.  The Agent shall be deemed to have exercised  reasonable
care in the custody of the  Collateral in its  possession  if the  Collateral is

                                       8


accorded  treatment  substantially  equal  to  that  which  it  accords  its own
property,  and shall not be liable or responsible  for any loss or damage to any
of the Collateral,  or for any diminution in the value thereof, by reason of the
act or omission of any broker or other Lender or bailee selected by the Agent in
good faith.  The Agent shall be deemed to have  exercised  reasonable  care with
respect  to any of the  Collateral  in its  possession  if the Agent  takes such
action for that purpose as the Grantor shall reasonably request in writing;  but
no failure to comply with any such request shall, of itself, be deemed a failure
to exercise reasonable care.

          Section 8.  APPOINTMENT  OF AGENT.  At any time or times,  in order to
comply with any legal requirement in any jurisdiction, the Lenders may appoint a
bank or trust company or one or more other Persons with such power and authority
as may be necessary for the effectual operation of the provisions hereof and may
be specified in the instrument of appointment.

          Section 9. REVISED  ARTICLE 9. Grantor hereby confirms that by signing
this  Agreement,  that  Grantor has  authenticated  this  Agreement,  within the
meaning of revised Chapter 9 of the Uniform Commercial Code-Secured Transactions
(La. R.S. 10:9-101 et seq.) and Revised Article 9 of the Uniform Commercial Code
as now or hereafter in effect in any  jurisdiction  ("Revised  Article 9"). This
Agreement  shall  constitute  full  authorization  in favor of the Agent to file
appropriate  financing  statements,  initial or "in lieu" financing  statements,
continuation statements,  and statements of amendment, with or without Grantor's
signature,  as may be  necessary  or  advisable  to  perfect  and  maintain  the
perfection and priority of the security  interest granted to the Lenders in this
Agreement,  including any such filings  containing such information  required by
Part 5 of Revised Article 9 for the  sufficiency or filing office  acceptance of
any financing statement,  continuation statement or amendment, including whether
Grantor is an organization, the type of organization and any organization number
issued to the Grantor.  Grantor  shall  furnish such  information  to Agent upon
Agent's  request.  Any such  financing  statements,  continuation  statements or
amendments may be signed by Agent on Grantor's behalf. Any such filings by Agent
may be by delivery of originals or photocopies, by electronic communication,  or
such other authorized form of communication as may be permitted under then.

          Section 10.  EXPENSES.  In the event that the Grantor  fails to comply
with any  provisions of the Credit  Agreement or this  Agreement,  such that the
value  of any  Collateral  or the  validity,  perfection,  rank or  value of any
security interest hereunder is thereby  diminished or potentially  diminished or
put at risk,  the  Agent  may upon  reasonable  prior  notice,  but shall not be
required to, effect such  compliance  on behalf of the Grantor,  and the Grantor
shall  reimburse  the Agent for the  costs  thereof  on  demand.  All  insurance
expenses and all expenses of  protecting,  storing,  appraising,  preparing  for
sale,  handling,  maintaining and shipping the  Collateral,  any and all excise,
property,  sales, and use taxes imposed by any federal, state or local authority
on any of the  Collateral,  all expenses in respect of periodic  appraisals  and
inspections of the Collateral to the extent the same may be reasonably requested
from time to time, and all expenses in respect of the sale or other  disposition
thereof  shall be borne and paid by the  Grantor,  and if the  Grantor  fails to
promptly pay any portion  thereof  when due,  the Agent may, at its option,  but
shall  not be  required  to,  pay the  same and  charge  the  Grantor's  account
therefor,  and the Grantor agrees to reimburse the Agent therefor on demand. All
sums so paid or incurred by the Agent for any of the  foregoing  and any

                                       9


and all other sums for which the Grantor  may become  liable  hereunder  and all
costs and expenses  (including  reasonable  attorneys'  fees, legal expenses and
court costs)  incurred by the Agent in enforcing or protecting any of the rights
or remedies under this Agreement,  together with interest  thereon until paid at
the rate equal the then highest rate of interest charged on the principal of any
of the  Indebtedness  due  under  the  Notes  plus one  percent  (1%),  shall be
additional  Indebtedness  hereunder  and the  Grantor  agrees  to pay all of the
foregoing sums promptly on demand.

          Section 11. TERMINATION. Upon the payment in full of the Indebtedness,
the  termination  of the Credit  Agreement  (and all  obligations of the Lenders
thereunder),  the termination of all Lenders' obligations to extend Loans to the
Borrower,  the  termination of all Rate Management  Transactions  (to the extent
constituting  Indebtedness),  and the payment of all Rate Management Transaction
obligations  (to the extent  constituting  Indebtedness),  this Agreement  shall
terminate.  Upon request of the Grantor,  the Agent shall  deliver the remaining
Collateral (if any) to the Grantor.

          Section 12. NOTICES.  Any notice or demand which, by provision of this
Agreement,  is required or permitted  to be given or served to the Grantor,  the
Agent, the Lenders,  and/or CCBM shall be deemed to have been sufficiently given
and served for all purposes if made in accordance with the Credit Agreement.

          Section 13.  AMENDMENT.  Neither  this  Agreement  nor any  provisions
hereof may be changed, waived,  discharged or terminated orally or in any manner
other  than by an  instrument  in  writing  signed  by the  party  against  whom
enforcement of the change, waiver, discharge or termination is sought.

          Section 14. WAIVERS.  No course of dealing on the part of the Agent or
the Lenders, their officers,  employees,  consultants or agents, nor any failure
or delay by the Agent or the  Lenders  with  respect  to  exercising  any of its
rights,  powers or  privileges  under this  Agreement  shall operate as a waiver
thereof.

          Section 15.  CUMULATIVE  RIGHTS.  The rights and remedies of the Agent
and the Lenders under this  Agreement  shall be  cumulative  and the exercise or
partial  exercise of any such right or remedy shall not preclude the exercise of
any other right or remedy.

          Section 16. TITLES OF SECTIONS.  All titles or headings to sections of
this  Agreement  are only for the  convenience  of the  parties and shall not be
construed  to have any effect or meaning  with  respect to the other  content of
such sections,  such other content being controlling as to the agreement between
the parties hereto.

          Section 17. GOVERNING LAW. This Agreement is a contract made under and
shall be  construed  in  accordance  with and governed by the laws of the United
States of America and the State of Louisiana.

          Section 18. SUCCESSORS AND ASSIGNS.  All covenants and agreements made
by or on behalf of the Grantor in this Agreement shall bind Grantor's successors
and assigns  and shall inure to the

                                       10


benefit of the  Agent,  the  Lenders  and their  successors  and  assigns.  This
Agreement  is for the  benefit of the Agent and the  Lenders  and for such other
Person or  Persons as may from time to time  become or be the  holders of any of
the  Indebtedness,  and this Agreement shall be transferable with the same force
and effect and to the same extent as the Indebtedness  may be  transferable,  it
being  understood  that,  upon the  transfer or  assignment  by the Agent or the
Lenders of any of the Indebtedness,  the legal holder of such Indebtedness shall
have  all of the  rights  granted  to the  Agent  and  the  Lenders  under  this
Agreement.   Grantor   specifically   agrees  that  upon  any  transfer  of  the
Indebtedness,  the Agent or the Lenders may transfer and deliver the  Collateral
to the transferee of such  Indebtedness  and the Collateral shall secure any and
all of the Indebtedness in favor of such a transferee, that such transfer of the
Collateral  shall not affect the  priority  and  ranking  thereof,  and that the
Collateral shall secure with retroactive rank the then existing  Indebtedness of
the Grantor to the transferee and any and all Indebtedness  thereafter  arising.
After any such transfer has taken place, the Agent or the Lenders shall be fully
discharged from any and all future liability and  responsibility  to the Grantor
with respect to the  Collateral and the  transferee  thereafter  shall be vested
with all the powers, rights and duties with respect to the Collateral.

          Section 19.  COUNTERPARTS.  This  Agreement  may be executed in two or
more  counterparts,  and it shall not be necessary  that the  signatures  of all
parties  hereto be contained on any one  counterpart  hereof,  each  counterpart
shall  be  deemed  an  original,  but all of which  when  taken  together  shall
constitute one and the same instrument.

         [the remainder of this page has been intentionally left blank]

                                       11


         IN WITNESS WHEREOF, the Grantor and the Agent have caused this
Agreement to be duly executed as of the date first above written.


                                    GRANTOR:

                                    CARRIZO OIL & GAS, INC.


                                    By:
                                        -------------------------
                                    Name:  Paul F. Boling
                                    Title: Vice President and
                                           Chief Financial Officer


                                    AGENT:

                                    HIBERNIA NATIONAL BANK, AGENT FOR THE
                                    LENDERS


                                    By:
                                    Name:
                                    Title: