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                                                                    EXHIBIT 4.3


                             STOCK PLEDGE AGREEMENT



         This STOCK PLEDGE AGREEMENT (this "Agreement"), dated effective as of
March 22, 1999, is entered into between STEVEN A. WEBSTER ("Debtor") and COMPASS
BANK, a Texas chartered bank ("Secured Party"), with reference to the following:

         WHEREAS, Debtor beneficially owns certain shares of common stock, as
more fully described on Schedule "A" attached hereto, of the corporation(s)
(herein called the "Issuers," whether one or more) identified under the column
entitled "Issuer" on Schedule "A";

         WHEREAS, Carrizo Oil & Gas, Inc. ("Borrower"), Debtor and Secured Party
entered into the Loan Agreement (as hereinafter defined);

         WHEREAS, Debtor has entered into a guaranty agreement (the "Guaranty
Agreement") dated effective March 22, 1999, pursuant to which Debtor has
guaranteed certain Obligations (as defined in the Loan Agreement) of Borrower to
Secured Party;

         WHEREAS, to induce Secured Party to grant the extensions of credit and
other financial accommodations provided to Borrower pursuant to the Loan
Agreement, Debtor agreed to pledge, grant, transfer, and assign to Secured Party
a security interest in the Collateral (as hereinafter defined) as security for
the Obligations of Borrower under the Loan Agreement and as security for
Debtor's obligations under the Guaranty Agreement.

         NOW, THEREFORE, in consideration of the mutual promises, covenants,
representations, and warranties set forth herein and for other good and valuable
consideration, the parties hereto agree as follows:

         1. Definitions and Construction.

            (a) Definitions. As used in this Agreement:

                 "Agreement" shall mean this Stock Pledge Agreement.

                 "Bankruptcy Code" shall mean The Bankruptcy Reform Act of 1978
(11 U.S.C. ??101-1330), as amended or supplemented from time to time, and any
successor statute, and all of the rules issued or promulgated in connection
therewith.

                 "Borrower" shall have the meaning ascribed thereto in the
recitations to this Agreement.

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                 "Business Day" shall have the meaning ascribed thereto in the
Loan Agreement.

                 "Collateral" shall mean the Pledged Shares, the Future Rights,
and the Proceeds, collectively.

                 "Debtor" shall have the meaning ascribed thereto in the
preamble to this Agreement.

                 "Event of Default" shall have the meaning ascribed thereto in
the Loan Agreement.

                 "Future Rights" shall mean: (a) all shares of, all securities
convertible or exchangeable into, and all warrants, options or other rights to
purchase shares of stock of (i) the Issuers (other than the Pledged Shares), and
(ii) any Person which, after the date of this Agreement, becomes a direct
Subsidiary of Debtor and is incorporated under the laws of any state of the
United States from time to time held or acquired by Debtor in any manner; and
(b) the certificates or instruments representing such additional shares,
convertible or exchangeable securities, warrants, and other rights and all
dividends, cash, options, warrants, rights, instruments, and other property or
proceeds from time to time received, receivable, or otherwise distributed in
respect of or in exchange for any or all of such shares.

                 "Guaranty Agreement" shall have the meaning ascribed thereto in
the recitations to this Agreement.

                 "Holder" and "Holders" shall have the meanings ascribed thereto
in Section 3 of this Agreement.

                 "Issuers" shall have the meaning ascribed thereto in the
recitals to this Agreement and shall also mean any successors thereto, whether
by merger or otherwise.

                 "Lien" shall mean any lien, mortgage, pledge, assignment
(including any assignment of rights to receive payments of money), security
interest, charge, or encumbrance of any kind (including any conditional sale or
other title retention agreement, any lease in the nature thereof, or any
agreement to give any security interest).

                 "Loan Agreement" shall mean that certain First Amended,
Restated, and Combined Loan Agreement dated August 28, 1997, as amended by the
First Amendment thereto dated December 23, 1997, the Second Amendment thereto
dated December 30, 1997, the Third Amendment thereto dated July 30, 1998, the
Fourth Amendment dated September 24, 1998, and the Fifth Amendment dated of even
date herewith.

                 "Loan Documents" shall have the meaning ascribed thereto in the
Loan Agreement.


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                 "Obligations" shall have the meaning ascribed thereto in the
Loan Agreement.

                 "Person" shall have the meaning ascribed thereto in the Loan
Agreement.

                 "Pledged Shares" shall have the meaning ascribed thereto in the
recitals to this Agreement.

                 "Proceeds" shall mean all proceeds (including proceeds of
proceeds) of the Pledged Shares and Future Rights including all: (a) rights,
benefits, distributions, premiums, profits, dividends, interest, cash,
instruments, documents of title, accounts, contract rights, inventory,
equipment, general intangibles, deposit accounts, chattel paper, and other
property from time to time received, receivable, or otherwise distributed in
respect of or in exchange for, or as a replacement of or a substitution for, any
of the Pledged Shares, Future Rights, or proceeds thereof (including any cash,
stock, or other securities or instruments issued after any recapitalization,
readjustment, reclassification, merger or consolidation with respect to the
Issuers and any claims against financial intermediaries; (b) proceeds of any
insurance, indemnity, warranty, or guaranty (including guaranties of delivery)
payable from time to time with respect to any of the Pledged Shares, Future
Rights, or proceeds thereof; (c) payments (in any form whatsoever) made or due
and payable to Debtor from time to time in connection with any requisition,
confiscation, condemnation, seizure or forfeiture of all or any part of the
Pledged Shares, Future Rights, or proceeds thereof; and (d) other amounts from
time to time paid or payable under or in connection with any of the Pledged
Shares, Future Rights, or proceeds thereof.

                 "Secured Party" shall have the meaning ascribed thereto in the
preamble to this Agreement.

                 "Securities Act" shall have the meaning ascribed thereto in
Section 9(b) of this Agreement.

                 "Subsidiary" shall have the meaning ascribed thereto in the
Loan Agreement.

All initially capitalized terms used herein and not otherwise defined shall have
the meaning ascribed thereto in the Loan Agreement.

             (b) Construction.

                 (i) Unless the context of this Agreement clearly requires
otherwise, references to the plural includes the singular and to the singular
includes the plural, the part includes the whole, the term "including" is not
limiting, and the term "or" has, except where otherwise indicated, the inclusive
meaning represented by the phrase "and/or." The words "hereof," "herein,"
"hereby," "hereunder," and other similar terms in this Agreement refer to this
Agreement as a whole and not exclusively to any particular provision of this
Agreement. Article, section, subsection, exhibit, and schedule references are to
this Agreement unless otherwise specified. All of the exhibits or schedules
attached to this Agreement shall be deemed incorporated herein by reference. Any



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reference to any of the following documents includes any and all alterations,
amendments, extensions, modifications, renewals, or supplements thereto or
thereof, as applicable: this Agreement, the Loan Agreement, and any of the other
Loan Documents.

                 (ii) Neither this Agreement nor any uncertainty or ambiguity
herein shall be construed or resolved against Secured Party or Debtor, whether
under any rule of construction or otherwise. On the contrary, this Agreement has
been reviewed by both of the parties and their respective counsel and shall be
construed and interpreted according to the ordinary meaning of the words used so
as to fairly accomplish the purposes and intentions of the parties hereto.

                 (iii) In the event of any direct conflict between the express
terms and provisions of this Agreement and of the Loan Agreement, the terms and
provisions of the Loan Agreement shall control.

         2. Pledge. As security for the prompt payment and performance in full
of: (a) the Obligations of Borrower to Secured Party with respect to the Second
Term Loan only, and (b) the obligations of Debtor to Secured Party in the
Guaranty Agreement; when due, whether at stated maturity, by acceleration or
otherwise (including amounts that would become due but for the operation of the
automatic stay under ?362(a) of the Bankruptcy Code), Debtor hereby pledges,
grants, transfers, and assigns to Secured Party a security interest in all of
Debtor's right, title, and interest in and to the Collateral.

         3. Delivery and Registration of Collateral.

            (a) All certificates or instruments representing or evidencing the
Collateral shall be promptly delivered by Debtor to Secured Party or Secured
Party's designee pursuant hereto at a location designated by Secured Party and
shall be held by or on behalf of Secured Party pursuant hereto, and shall be in
suitable form for transfer by delivery, or shall be accompanied by duly executed
instruments of transfer or assignment in blank, all in form and substance
satisfactory to Secured Party.

            (b) Secured Party shall have the right, at any time in its
discretion and without notice to Debtor, to transfer to or to register on the
books of the Issuers (or of any other Person maintaining records with respect to
the Collateral) in the name of Secured Party or any of its nominees any or all
of the Collateral. In addition, Secured Party shall have the right at any time
to exchange certificates or instruments representing or evidencing Collateral
for certificates or instruments of smaller or larger denominations.

            (c) If, at any time and from time to time, any Collateral (including
any certificate or instrument representing or evidencing any Collateral) is in
the possession of a Person other than Secured Party or Debtor (a "Holder"), then
Debtor shall immediately, at Secured Party's option, either cause such
Collateral to be delivered into Secured Party's possession, or execute and
deliver to such Holder a written notification/ instruction, and take all other
steps necessary to perfect the security interest of Secured Party in such
Collateral, including obtaining from such Holder a written acknowledgment that
such Holder holds such Collateral for Secured Party, all pursuant to the

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applicable laws governing the perfection of Secured Party's security interest in
the Collateral in the possession of such Holder. Each such
notification/instruction and acknowledgment shall be in form and substance
satisfactory to Secured Party.

            (d) Any and all Collateral (including dividends, interest, and other
cash distributions) at any time received or held by Debtor shall be so received
or held in trust for Secured Party, shall be segregated from other funds and
property of Debtor and shall be forthwith delivered to Secured Party in the same
form as so received or held, with any necessary endorsements.

            (e) If at any time and from time to time any Collateral consists of
an uncertificated security or a security in book entry form, then Debtor shall
immediately cause such Collateral to be registered or entered, as the case may
be, in the name of Secured Party, or otherwise cause Secured Party's security
interest thereon to be perfected in accordance with applicable law.

         4. Voting Rights and Dividends.

            (a) So long as no Event of Default shall have occurred and be
continuing, Debtor shall be entitled to exercise any and all voting and other
consensual rights pertaining to the Collateral or any part thereof for any
purpose not inconsistent with the terms of the Loan Agreement and shall be
entitled to receive and retain any cash dividends or distributions paid in
respect of the Collateral.

            (b) Upon the occurrence and during the continuance of an Event of
Default, all rights of Debtor to exercise the voting and other consensual rights
or receive and retain cash dividends or distributions which it would otherwise
be entitled to exercise or receive and retain, as applicable pursuant to Section
4(a) shall cease, and all such rights shall thereupon become vested in Secured
Party, who shall thereupon have the sole right to exercise such voting or other
consensual rights and to receive and retain such cash dividends and
distributions. Debtor shall execute and deliver (or cause to be executed and
delivered) to Secured Party all such proxies and other instruments as Secured
Party may request for the purpose of enabling Secured Party to exercise the
voting and other rights which it is entitled to exercise pursuant to this
subsection (b).

         5. Representations and Warranties. Debtor represents, warrants, and
covenants as follows:

            (a) Debtor has taken all steps it deems necessary or appropriate to
be informed on a continuing basis of changes or potential changes affecting the
Collateral (including rights of conversion and exchange, rights to subscribe,
payment of dividends, reorganizations or recapitalization, tender offers and
voting rights), and Debtor agrees that Secured Party shall have no
responsibility or liability for informing Debtor of any such changes or
potential changes or for taking any action or omitting to take any action with
respect thereto;

            (b) All information herein or hereafter supplied to Secured Party by
or on behalf of Debtor in writing with respect to the Collateral is, or in the
case of information hereafter supplied will be, accurate and complete in all
material respects;


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            (c) Debtor is and will be the sole legal and beneficial owner of the
Collateral (including the Pledged Shares and all other Collateral acquired by
Debtor after the date hereof) free and clear of any adverse claim, Lien, or
other right, title, or interest of any party;

            (d) This Agreement, and the delivery to Secured Party of the Pledged
Shares representing Collateral (or the delivery to all Holders of the Pledged
Shares representing Collateral of the notification/instruction referred to in
Section 3 of this Agreement), creates a valid, perfected, and first priority
security interest in one hundred percent (100%) of the Pledged Shares in favor
of Secured Party securing payment of the Obligations, and all actions necessary
to achieve such perfection have been duly taken;

            (e) Schedule A to this Agreement is true and correct and complete in
all material respects; without limiting the generality of the foregoing: (i) all
the Pledged Shares are in certificated form, and, except to the extent
registered in the name of Secured Party or its nominee pursuant to the
provisions of this Agreement, are registered in the name of Debtor; and (ii) the
Pledged Shares as to each of the Issuers constitute at least the percentage of
all the fully diluted issued and outstanding shares of stock of such Issuer as
set forth in Schedule A to this Agreement (if any such percentages are set forth
on Schedule A);

            (f) There are no presently existing Future Rights or Proceeds owned
by Debtor;

            (g) The Pledged Shares have been duly authorized and validly issued
and are fully paid and nonassessable; and

            (h) Neither the pledge of the Collateral pursuant to this Agreement
nor the extensions of credit represented by the Obligations violates Regulation
G, T, U or X of the Board of Governors of the Federal Reserve System.

         6. Further Assurances.

            (a) Debtor agrees that from time to time, at the expense of Debtor,
Debtor will promptly execute and deliver all further instruments and documents,
and take all further action that may be necessary or desirable, or that Secured
Party may request, in order to perfect and protect any security interest granted
or purported to be granted hereby or to enable Secured Party to exercise and
enforce its rights and remedies hereunder with respect to any Collateral.
Without limiting the generality of the foregoing, Debtor will: (i) at the
request of Secured Party, mark conspicuously each of its records pertaining to
the Collateral with a legend, in form and substance satisfactory to Secured
Party, indicating that such Collateral is subject to the security interest
granted hereby; (ii) execute and file such financing or continuation statements,
or amendments thereto, and such other instruments or notices, as may be
necessary or desirable, or as Secured Party may request, in order to perfect and
preserve the security interests granted or purported to be granted hereby; (iii)
as more fully set forth in the Loan Agreement, allow inspection of the
Collateral by Secured Party or Persons designated by Secured Party; and (iv)
appear in and defend any action or proceeding that may affect Debtor's title to
or Secured Party's security interest in the Collateral.


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            (b) Debtor hereby authorizes Secured Party to file one or more
financing or continuation statements, and amendments thereto, relative to all or
any part of the Collateral without the signature of Debtor where permitted by
law. A carbon, photographic, or other reproduction of this Agreement or any
financing statement covering the Collateral or any part thereof shall be
sufficient as a financing statement where permitted by law.

            (c) Debtor will furnish to Secured Party, upon the request of
Secured Party: (1) a certificate executed by Debtor, and dated as of the date of
delivery to Secured Party, itemizing in such detail as Secured Party may
request, the Collateral which, as of the date of such certificate, has been
delivered to Secured Party by Debtor pursuant to the provisions of this
Agreement; and (ii) such statements and schedules further identifying and
describing the Collateral and such other reports in connection with the
Collateral as Secured Party may request.

         7. Covenants of Debtor. Debtor shall:

            (a) Perform each and every covenant in the Loan Agreement and in the
Guaranty Agreement applicable to Debtor;

            (b) At all times keep at least one complete set of its records
concerning substantially all of the Collateral at the address set forth below
his signature on this Agreement, and not change the location of its office or
such records without giving Secured Party at least thirty (30) days prior
written notice thereof; and

            (c) Upon receipt by Debtor of any material notice, report, or other
communication from any of the Issuers or any Holder relating to all or any part
of the Collateral, deliver such notice, report or other communication to Secured
Party as soon as possible, but in no event later than five (5) Business Days
following the receipt thereof by Debtor.

         8. Secured Party as Debtor's Attorney-in-Fact.

            (a) Debtor hereby irrevocably appoints Secured Party as Debtor's
attorney-in-fact, with full authority in the place and stead of Debtor and in
the name of Debtor, Secured Party or otherwise, from time to time at Secured
Party's discretion, to take any action and to execute any instrument that
Secured Party may deem necessary or advisable to accomplish the purposes of this
Agreement, including: (i) after the occurrence and during the continuance of an
Event of Default, to receive, endorse, and collect all instruments made payable
to Debtor representing any dividend, interest payment or other distribution in
respect of the Collateral or any part thereof to the extent permitted hereunder
and to give full discharge for the same and to execute and file governmental
notifications and reporting forms; (ii) to issue any notifications/instructions
Secured Party deems necessary pursuant to Section 3 of this Agreement; or (iii)
to arrange for the transfer of the Collateral on the books of the Issuers or any
other Person to the name of Secured Party or to the name of Secured Party's
nominee.

            (b) In addition to the designation of Secured Party as Debtor's
attorney-in-fact in subsection (a), Debtor hereby irrevocably appoints Secured
Party as Debtor's agent and 


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attorney-in-fact to make, execute and deliver any and all documents and writings
which may be necessary or appropriate for approval of, or be required by, any
regulatory authority located in any city, county or state where Debtor or any of
the Issuers engages in business, in order to transfer or to more effectively
transfer any of the Pledged Shares or otherwise enforce Secured Party's rights
hereunder.

         9. Remedies upon Default. Upon the occurrence and during the
continuance of an Event of Default:

            (a) Secured Party may exercise in respect of the Collateral, in
addition to other rights and remedies provided for herein or otherwise available
to it, all the rights and remedies of a secured party on default under the Texas
Business and Commerce Code (the "Code") (irrespective of whether the Code
applies to the affected items of Collateral), and Secured Party may also without
notice (except as specified below) sell the Collateral or any part thereof in
one or more parcels at public or private sale, at any exchange, broker's board
or at any of Secured Party's offices or elsewhere, for cash, on credit or for
future delivery, at such time or times and at such price or prices and upon such
other terms as Secured Party may deem commercially reasonable, irrespective of
the impact of any such sales on the market price of the Collateral. To the
maximum extent permitted by applicable law, Secured Party may be the purchaser
of any or all of the Collateral at any such sale and shall be entitled, for the
purpose of bidding and making settlement or payment of the purchase price for
all or any portion of the Collateral sold at any such public sale, to use and
apply all or any part of the Obligations as a credit on account of the purchase
price of any Collateral payable at such sale. Each purchaser at any such sale
shall hold the property sold absolutely free from any claim or right on the part
of Debtor, and Debtor hereby waives (to the extent permitted by law) all rights
of redemption, stay, or appraisal that it now has or may at any time in the
future have under any rule of law or statute now existing or hereafter enacted.
Debtor agrees that, to the extent notice of sale shall be required by law, at
least ten (10) calendar days notice to Debtor of the time and place of any
public sale or the time after which a private sale is to be made shall
constitute reasonable notification. Secured Party shall not be obligated to make
any sale of Collateral regardless of notice of sale having been given. Secured
Party may adjourn any public or private sale from time to time by announcement
at the time and place fixed therefor, and such sale may, without further notice,
be made at the time and place to which it was so adjourned. To the maximum
extent permitted by law, Debtor hereby waives any claims against Secured Party
arising because the price at which any Collateral may have been sold at such a
private sale was less than the price that might have been obtained at a public
sale, even if Secured Party accepts the first offer received and does not offer
such Collateral to more than one offeree.

            (b) Debtor hereby acknowledges that the sale by Secured Party of any
Collateral pursuant to the terms hereof in compliance with the Securities Act of
1933 as now in effect or as hereafter amended, or any similar statute hereafter
adopted with similar purpose or effect (the "Securities Act"), as well as
applicable "Blue Sky" or other state securities laws may require strict
limitations as to the manner in which Secured Party or any subsequent transferee
of the Collateral may dispose thereof. Debtor acknowledges and agrees that in
order to protect Secured Party's interest it may be necessary to sell the
Collateral at a price less than the maximum price attainable if a sale were
delayed or were made in another manner, such as a public offering under the
Securities 


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Act. Debtor has no objection to sale in such a manner and agrees that Secured
Party shall have no obligation to obtain the maximum possible price for the
Collateral. Without limiting the generality of the foregoing, Debtor agrees
that, upon the occurrence and during the continuation of an Event of Default,
Secured Party may, subject to applicable law, from time to time attempt to sell
all or any part of the Collateral by a private placement, restricting the
bidders and prospective purchasers to those who will represent and agree that
they are purchasing for investment only and not for distribution. In so doing,
Secured Party may solicit offers to buy the Collateral or any part thereof for
cash, from a limited number of investors deemed by Secured Party to be
institutional investors or other responsible parties who might be interested in
purchasing the Collateral. If Secured Party shall solicit such offers, then the
acceptance by Secured Party of one of the offers shall be deemed to be a
commercially reasonable method of disposition of the Collateral.

            (c) If Secured Party shall determine to exercise its right to sell
all or any portion of the Collateral pursuant to this Section, Debtor agrees
that upon request of Secured Party, Debtor will, at its own expense:

                (i) execute and deliver, or cause the officers and directors of
the Issuers to execute and deliver, to any person, entity or governmental
authority as Secured Party may choose, any and all documents and writings which
may be necessary or appropriate for approval, or be required by, any regulatory
authority located in any city, county, state or country where Debtor or any of
the Issuers engage in business, in order to transfer or to more effectively
transfer the Pledged Shares or otherwise enforce Secured Party's rights
hereunder;

                (ii) do or cause to be done all such other acts and things as
may be necessary to make such sale of the Collateral or any part thereof valid
and binding and in compliance with applicable law; and

                (iii) with respect to any of the Collateral that is not
registered under the Securities Act and the rules and regulations of the
Securities and Exchange Commission applicable thereto:

                      (a) use its best efforts to execute and deliver, and
     cause the Borrower and the directors and officers thereof to execute and
     deliver, all such instruments and documents, and to do or cause to be done
     all such other acts and things, as may be necessary or, in the opinion of
     Secured Party, advisable to register such Collateral under the provisions
     of the Securities Act, and to cause the registration statement relating
     thereto to become effective and to remain effective for such period as
     prospectuses are required by law to be furnished, and to make all
     amendments and supplements thereto and to the related prospectuses which,
     in the opinion of Secured Party, are necessary or advisable, all in
     conformity with the requirements of the Securities Act and the rules and
     regulations of the Securities and Exchange Commission applicable thereto;


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                      (b) use its best efforts to qualify the Collateral under
     the state securities laws or "Blue Sky" laws and to obtain all necessary
     governmental approvals for the sale of the Collateral, as requested by
     Secured Party; and

                      (c) cause the Issuers to make available to its or their
     security holders, as soon as practicable, an earnings statement which will
     satisfy the provisions of Section II (a) of the Securities Act.

Debtor acknowledges that there is no adequate remedy at law for failure by it to
comply with the provisions of this Section and that such failure would not be
adequately compensable in damages, and therefore agrees that its agreements
contained in this Section may be specifically enforced.

         10. Secured Party; Duties; Standard of Care. The powers conferred on
Secured Party hereunder are solely to protect its interests in the Collateral
and shall not impose on it any duty to exercise such powers.

         11. CHOICE OF LAW; CONSENT TO JURISDICTION.

             (a) THE VALIDITY OF THIS AGREEMENT, ITS CONSTRUCTION,
INTERPRETATION AND ENFORCEMENT, AND THE RIGHTS OF THE PARTIES HERETO, SHALL BE
DETERMINED UNDER, GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH THE INTERNAL
LAWS OF THE STATE OF TEXAS.

             (b) THE PARTIES AGREE THAT ALL ACTIONS OR PROCEEDINGS ARISING IN
CONNECTION WITH THIS AGREEMENT SHALL BE TRIED AND LITIGATED ONLY IN THE STATE
AND FEDERAL COURTS LOCATED IN THE COUNTY OF HARRIS, STATE OF TEXAS OR, AT THE
SOLE OPTION OF SECURED PARTY, IN ANY OTHER COURT IN WHICH SECURED PARTY SHALL
INITIATE LEGAL OR EQUITABLE PROCEEDINGS AND WHICH HAS SUBJECT MATTER
JURISDICTION OVER THE MATTER IN CONTROVERSY. EACH OF DEBTOR AND SECURED PARTY
WAIVES, TO THE EXTENT PERMITTED UNDER APPLICABLE LAW, ANY RIGHT EACH MAY HAVE TO
ASSERT THE DOCTRINE OF FORUM NON CONVENIENS OR TO OBJECT TO VENUE TO THE EXTENT
ANY PROCEEDING IS BROUGHT IN ACCORDANCE WITH THIS SECTION 11.

         12. Amendments; etc. No amendment or waiver of any provision of this
Agreement nor consent to any departure by Debtor herefrom, shall in any event be
effective unless the same shall be in writing and signed by Secured Party, and
then such waiver or consent shall be effective only in the specific instance and
for the specific purpose for which given. No failure on the part of Secured
Party to exercise, and no delay in exercising any right under this Agreement,
the Loan Agreement, or otherwise with respect to any of the Obligations, shall
operate as a waiver thereof; nor shall any single or partial exercise of any
right under this Agreement, the Loan Agreement, or otherwise with respect to any
of the Obligations preclude any other or further exercise thereof or the
exercise of any other right. The remedies herein provided in this Agreement or
otherwise with respect to any of the Obligations are cumulative and not
exclusive of any remedies provided by law.


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         13. Notices. Unless otherwise specifically provided herein, any notice
or other communication herein required or permitted to be given shall be given
in accordance with the terms of Section 8.03 of the Loan Agreement. Any such
notice to Borrower shall also be sent to Debtor as set forth in section 8.03 of
the Loan Agreement.

         14. Continuing Security Interest. This Agreement shall create a
continuing security interest in the Collateral and shall: (i) remain in full
force and effect until the indefeasible payment in full of the Obligations, and
the full and final termination of any commitment to extend any financial
accommodations under the Loan Agreement; (ii) be binding upon Debtor, its
successors and assigns; and (iii) inure to the benefit of Secured Party and its
successors, transferees, and assigns. Upon the indefeasible payment in full of
the Obligations, and the full and final termination of any commitment to extend
any financial accommodations under the Loan Agreement, the security interests
granted hereby shall automatically terminate and all rights to the Collateral
shall revert to Debtor. Upon any such termination, Secured Party will, at
Debtor's expense, execute and deliver to Debtor such documents as Debtor shall
reasonably request to evidence such termination. Such documents shall be
prepared by Debtor and shall be in form and substance satisfactory to Secured
Party.

         15. Security Interest Absolute. To the maximum extent permitted by law,
all rights of Secured Party and security interests hereunder, and all
obligations of the Debtor hereunder, shall be absolute and unconditional
irrespective of:

             (a) any lack of validity or enforceability of any of the
Obligations or any other agreement or instrument relating thereto, including the
Loan Agreement or any of the other Loan Documents;

             (b) any change in the time, manner or place of payment of, or in
any other term of, all or any of the Obligations, or any other amendment or
waiver of or any consent to any departure from the Loan Agreement or any of the
other Loan Documents, or any other agreement or instrument relating thereto;

             (c) any exchange, release or non-perfection of any other
collateral, or any release or amendment or waiver of or consent to departure
from any guaranty for all or any of the Obligations; or

             (d) any other circumstances that might otherwise constitute a
defense available to, or a discharge of, Debtor.

To the maximum extent permitted by law, Debtor hereby waives any right to
require Secured Party to pursue any other remedy in Secured Party's power
whatsoever.

         16. Headings. Section and subsection headings in this Agreement are
included herein for convenience of reference only and shall not constitute a
part of this Agreement or be given any substantive effect.


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         17. Severability. In case any provision in or obligation under this
Agreement shall be invalid, illegal or unenforceable in any jurisdiction, the
validity, legality and enforceability of the remaining provisions or
obligations, or of such provision or obligation in any other jurisdiction, shall
not in any way be affected or impaired thereby.

         18. Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original and all of which
together shall constitute one and the same Agreement.

         19. Waiver of Marshaling. Each of Debtor and Secured Party acknowledges
and agrees that in exercising any rights under or with respect to the
Collateral: (i) Secured Party is under no obligation to marshal any collateral
pledged to it; (ii) may, in its absolute discretion, realize upon such
Collateral in any order and in any manner it so elects; and (iii) may, in its
absolute discretion, apply the proceeds of any or all of such Collateral to the
obligations secured by the Collateral in any order and in any manner it so
elects.



                                      -12-
   13

         IN WITNESS WHEREOF, Debtor and Secured Party have caused this Agreement
to be duly executed and delivered as of the date first above written.

                                             DEBTOR


                                             ----------------------------------
                                                     Steven A. Webster

                                             Debtor's address:
                                             901 Threadneedle, Suite 200
                                             Houston, Texas 77079


                                             SECURED PARTY

                                             COMPASS BANK


                                             By:
                                                -------------------------------
                                                  Kathleen J. Bowen
                                                  Vice President


                                      -13-
   14

                                   SCHEDULE A
                                       TO
                             STOCK PLEDGE AGREEMENT

                                     Part A



                                               Pledged Shares
                                               --------------
                           Number of             Certificate   Debtor's Percentage   Jurisdiction of
        Issuer              Shares      Class     Number(s)         Ownership         Incorporation
- ----------------------     ---------    -----    -----------   -------------------   ---------------
                                                                      
R&B Falcon Corporation      143,800                                                                



                                      -1-