EXHIBIT 10.2

THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE BEEN ACQUIRED FOR INVESTMENT
AND HAVE NOT BEEN REGISTERED  UNDER THE SECURITIES ACT OF 1933. THESE SECURITIES
MAY  NOT BE SOLD OR  TRANSFERRED  IN THE  ABSENCE  OF  SUCH  REGISTRATION  OR AN
EXEMPTION   THEREFROM  UNDER  SAID  ACT  OR  APPLICABLE  STATE  BLUE  SKY  LAWS.
ADDITIONALLY,  THE  TRANSFER OF THESE  SECURITIES  IS SUBJECT TO THE  CONDITIONS
SPECIFIED IN THE NOTE PURCHASE  AGREEMENT,  DATED AS OF OCTOBER 29, 2004, BY AND
AMONG THE ISSUER HEREOF,  THE HOLDERS AND PCRL  INVESTMENTS  L.P., AS COLLATERAL
AGENT  FOR  THE  HOLDERS  ("PURCHASE  AGREEMENT"),  AND  NO  TRANSFER  OF  THESE
SECURITIES  SHALL  BE  VALID  OR  EFFECTIVE  UNTIL  SUCH  CONDITIONS  HAVE  BEEN
FULFILLED. UPON THE FULFILLMENT OF CERTAIN OF SUCH CONDITIONS, THE ISSUER HEREOF
HAS AGREED TO DELIVER TO THE HOLDER HEREOF A NEW  CERTIFICATE,  NOT BEARING THIS
LEGEND,  FOR THE  SECURITIES  REPRESENTED  HEREBY  REGISTERED IN THE NAME OF THE
HOLDER  HEREOF.  COPIES OF SUCH  AGREEMENT MAY BE OBTAINED AT NO COST BY WRITTEN
REQUEST MADE BY THE HOLDER OF RECORD OF THIS CERTIFICATE TO THE SECRETARY OF THE
ISSUER HEREOF.

THIS NOTE IS SUBJECT TO THE PROVISIONS OF THE SUBORDINATION AGREEMENT,  DATED AS
OF OCTOBER 29, 2004, AMONG PCRL  INVESTMENTS  L.P., IN ITS CAPACITY AS PURCHASER
AND AS  COLLATERAL  AGENT FOR THE HOLDERS  PURSUANT TO THE  PURCHASE  AGREEMENT,
HIBERNIA  NATIONAL  BANK,  IN ITS  CAPACITY  AS  ADMINISTRATIVE  AGENT  FOR  THE
FINANCIAL  INSTITUTIONS  PARTY TO THE SENIOR CREDIT AGREEMENT (AS DEFINED IN THE
SUBORDINATION  AGREEMENT)  AND COMPANY  (THE  "SUBORDINATION  AGREEMENT").  EACH
HOLDER OF THIS  PROMISSORY  NOTE  SHALL BE  DEEMED,  BY VIRTUE OF SUCH  HOLDER'S
ACQUISITION OF THIS  PROMISSORY  NOTE, TO HAVE AGREED TO PERFORM AND OBSERVE ALL
OF THE TERMS,  COVENANTS,  AND  CONDITIONS  TO BE  PERFORMED  OR OBSERVED BY THE
SUBORDINATED LENDER UNDER (AND AS DEFINED IN) THE SUBORDINATION AGREEMENT.

           10% SENIOR SUBORDINATED SECURED NOTE DUE DECEMBER 15, 2008

No. 1
U.S. $18,000,000.00                                     Dated:  October 29, 2004

     FOR VALUE  RECEIVED,  the  undersigned,  CARRIZO OIL & GAS,  INC.,  a Texas
corporation  (the  "Company"),  HEREBY  PROMISES  TO PAY to the  order  of  PCRL
INVESTMENTS  L.P. (the  "Holder") or its successors or assigns the principal sum
of EIGHTEEN  MILLION AND NO/100 UNITED STATES DOLLARS  ($18,000,000.00)  or such
greater or lesser  principal amount of this Note then  outstanding,  on December
15, 2008 (the "Maturity Date"), with interest (calculated on the basis of a year
of 360 days,  consisting of twelve,  30-day months) (a) on the unpaid  principal
amount  hereof at the rate of 10% per  annum  from  October  29,  2004,  payable
quarterly  in arrears  each March 5, June 5,  September 5 and December 5 (each a
"Payment Date"), commencing March 5, 2004, until the principal hereof

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shall have become due and  payable,  and (b) on the unpaid  balance  hereof at a
rate of 12% per annum upon the occurrence and during the continuance of an Event
of Default as defined in the Purchase Agreement referred to below.

     Except as otherwise  provided in Sections  3.3, 3.5 and 3.6 of the Purchase
Agreement referred to below,  payments of principal of, interest on and premium,
if any,  with  respect to this Note are to be made in lawful money of the United
States of America,  by wire transfer of  immediately  available  funds,  to such
account as the holder of this Note shall have specified by written notice to the
Company from time to time; provided that notwithstanding the foregoing,  on each
Payment Date  occurring  on or before June 5, 2007,  the Company may defer fifty
percent  (50%) of the  interest  due on such  Payment  Date  and  such  deferred
interest  shall become a part of the  principal  due hereunder as of the Payment
Date such interest  became due,  shall earn  interest as provided  hereunder and
shall be due and payable on the Maturity Date unless the maturity of the amounts
due hereunder are accelerated pursuant to the terms of this Agreement.

     This Note is one of the Notes (herein called the "Notes")  issued  pursuant
to the Note  Purchase  Agreement,  dated as of  October  29,  2004 (as it may be
amended,  supplemented  or  otherwise  modified  from  time to time,  being  the
"Purchase  Agreement"),  by and  among  the  Company,  the  Purchasers  and PCRL
Investments L.P., as Collateral Agent. Each holder of' this Note will be deemed,
by its  acceptance  hereof,  (i) to have made the  representations  set forth in
Article XIII of the Purchase  Agreement;  (ii) to have agreed to be bound by the
subordination provisions set forth in Article XIV of the Purchase Agreement; and
(iii) to have agreed to be bound by the confidentiality  provisions set forth in
Section 16.15 of the Purchase Agreement.

     This Note is a registered Note and, as provided in the Purchase  Agreement,
upon surrender of this Note for  registration of transfer duly executed,  by the
registered  holder hereof or such holder's  attorney duly authorized in writing,
and compliance with other provisions of the Purchase Agreement, a new Note for a
like  principal  amount  will be issued to, and  registered  in the name of, the
transferee.  Prior to due presentment for registration of transfer,  the Company
may treat the person in whose name this Note is  registered  as the owner hereof
for the purpose of receiving payment and for all other purposes, and the Company
will not be affected by any notice to the contrary.

     This Note is subject to prepayment,  in whole or from time to time in part,
at the times and on the  terms  specified  in the  Purchase  Agreement,  but not
otherwise.

     If an Event of  Default,  under and as defined in the  Purchase  Agreement,
occurs and is  continuing,  the entire unpaid  principal of this Note,  together
with  accrued  interest  thereon,  may be declared or  otherwise  become due and
payable in the manner, at the price and with the effect provided in the Purchase
Agreement.

     Demand,  presentment,  protest  and notice of  non-payment  and protest are
hereby waived by the Company.

     This Note shall be governed by, and construed and interpreted in accordance
with, the laws of the State of New York.

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     All  capitalized  terms  used but not  defined  herein  have  the  meanings
ascribed to them in the Purchase Agreement referred to above.

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     IN WITNESS WHEREOF,  the Company has caused this Note to be executed by its
duly authorized officer as of the date first set forth above.

                                            CARRIZO OIL & GAS, INC.



                                            By: /s/ S. P. JOHNSON IV
                                                --------------------
                                            Name:   S. P. Johnson IV
                                            Title:  President





                                    GUARANTY

     For value  received,  CCBM,  INC.,  a Texas  corporation,  pursuant to that
certain  Commercial  Guaranty  dated  October 29, 2004,  hereby  unconditionally
guarantees  to the Holder of the Note upon which this  Guaranty is endorsed  (a)
the due and punctual payment,  on a limited and subordinated  basis as set forth
in Article XIV of the  Purchase  Agreement  pursuant to which such Note and this
Guaranty were issued, of the principal of, premium (if any) and interest on such
Note when and as the same shall become due and payable for any reason  according
to the terms of such Note and Article IX of the Purchase Agreement, and (b) that
all other  obligations  of the Company  under the Agreement or the Notes will be
promptly paid in full or performed in accordance with the terms of the Agreement
and the Notes.



                                            CCBM, INC.


                                            By: /s/ S. P. JOHNSON IV
                                                --------------------
                                            Name:   S. P. Johnson IV
                                            Title:  President