UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934
                                (Amendment No. 1)

                                 USG CORPORATION
--------------------------------------------------------------------------------
                                (Name of Issuer)

                          Common Stock, $0.10 par value
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    903293405
                                    ---------
                                 (CUSIP Number)

                                December 17, 2004
                                -----------------
                      (Date of Event Which Requires Filing
                               of this Statement)



Check the appropriate box to designate the rule pursuant to which this Schedule
                                    is filed:

                                [ ] Rule 13d-1(b)
                                [X] Rule 13d-1(c)
                                [ ] Rule 13d-1(d)



*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

------------------- ----------------- CUSIP No. 903293405 13G Page 2 of 9 Pages ------------------- ----------------- ---------- --------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NO. OF ABOVE PERSON D. E. Shaw Laminar Portfolios, L.L.C. - (IRS Identification No. 01-0577802) ---------- --------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] ---------- --------------------------------------------------------------------- 3 SEC USE ONLY ---------- --------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware --------------------- ----- ---------------------------------------------------- 5 SOLE VOTING POWER 0 NUMBER OF ----- ---------------------------------------------------- SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED 2,839,600 BY ----- ---------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 0 WITH ----- ---------------------------------------------------- 8 SHARED DISPOSITIVE POWER 2,839,600 ---------- --------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,839,600 ---------- --------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] ---------- --------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 6.6% ---------- --------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* OO ---------- --------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT

------------------- ----------------- CUSIP No. 903293405 13G Page 3 of 9 Pages ------------------- ----------------- ---------- --------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NO. OF ABOVE PERSON D. E. Shaw & Co., L.P. - (IRS Identification No. 13-3695715) ---------- --------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] ---------- --------------------------------------------------------------------- 3 SEC USE ONLY ---------- --------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware --------------------- ----- ---------------------------------------------------- 5 SOLE VOTING POWER 0 NUMBER OF ----- ---------------------------------------------------- SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED 2,839,600 BY ----- ---------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 0 WITH ----- ---------------------------------------------------- 8 SHARED DISPOSITIVE POWER 2,839,600 ---------- --------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,839,600 ---------- --------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] ---------- --------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 6.6% ---------- --------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IA, PN ---------- --------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT

------------------- ----------------- CUSIP No. 903293405 13G Page 4 of 9 Pages ------------------- ----------------- ---------- --------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NO. OF ABOVE PERSON D. E. Shaw & Co., L.L.C. - (IRS Identification No. 13-3799946) ---------- --------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] ---------- --------------------------------------------------------------------- 3 SEC USE ONLY ---------- --------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware --------------------- ----- ---------------------------------------------------- 5 SOLE VOTING POWER 0 NUMBER OF ----- ---------------------------------------------------- SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED 2,839,600 BY ----- ---------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 0 WITH ----- ---------------------------------------------------- 8 SHARED DISPOSITIVE POWER 2,839,600 ---------- --------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,839,600 ---------- --------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] ---------- --------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 6.6% ---------- --------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* 00 ---------- --------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT

------------------- ----------------- CUSIP No. 903293405 13G Page 5 of 9 Pages ------------------- ----------------- ---------- --------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NO. OF ABOVE PERSON David E. Shaw ---------- --------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] ---------- --------------------------------------------------------------------- 3 SEC USE ONLY ---------- --------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION United States --------------------- ----- ---------------------------------------------------- 5 SOLE VOTING POWER 0 NUMBER OF ----- ---------------------------------------------------- SHARES 6 SHARED VOTING POWER BENEFICIALLY OWNED 2,839,600 BY ----- ---------------------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING PERSON 0 WITH ----- ---------------------------------------------------- 8 SHARED DISPOSITIVE POWER 2,839,600 ---------- --------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,839,600 ---------- --------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] ---------- --------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 6.6% ---------- --------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN ---------- --------------------------------------------------------------------- *SEE INSTRUCTION BEFORE FILLING OUT

Item 1(a) Name of Issuer: --------------- USG Corporation Item 1(b) Address of Issuer's Principal Executive Offices: ------------------------------------------------ 125 S. Franklin Street Department 188 Chicago, IL 60606 Item 2(a) Name of Person Filing: ---------------------- D. E. Shaw Laminar Portfolios, L.L.C. D. E. Shaw & Co., L.P. D. E. Shaw & Co., L.L.C. David E. Shaw Item 2(b) Address of Principal Business Office: ------------------------------------- The business address for all filers is: 120 W. 45th Street, Tower 45, 39th Floor New York, NY 10036 Item 2(c) Citizenship: ------------ D. E. Shaw Laminar Portfolios, L.L.C. is a limited liability company organized under the laws of the state of Delaware. D. E. Shaw & Co., L.P. is a limited partnership organized under the laws of the state of Delaware. D. E. Shaw & Co., L.L.C. is a limited liability company organized under the laws of the state of Delaware. David E. Shaw is a citizen of the United States of America.

Item 2(d) Title of Class of Securities: ----------------------------- Common Stock, $0.10 par value (the "Shares") Item 2(e) CUSIP Number: ------------- 903293405 Item 3 Not Applicable Item 4 Ownership: ---------- As of the close of business on December 27, 2004: (a) Amount beneficially owned: D. E. Shaw Laminar Portfolios, L.L.C.: 2,839,600 Shares D. E. Shaw & Co., L.P.: 2,839,600 Shares D. E. Shaw & Co., L.L.C.: 2,839,600 Shares David E. Shaw: 2,839,600 Shares (b) Percent of class: D. E. Shaw Laminar Portfolios, L.L.C.: 6.6% D. E. Shaw & Co., L.P.: 6.6% D. E. Shaw & Co., L.L.C.: 6.6% David E. Shaw: 6.6% (c) Number of Shares to which the person has: (i) Sole power to vote or to direct the vote: D. E. Shaw Laminar Portfolios, L.L.C.: -0- D. E. Shaw & Co., L.P.: -0- D. E. Shaw & Co., L.L.C.: -0- David E. Shaw: -0- (ii) Shared power to vote or to direct the vote: D. E. Shaw Laminar Portfolios, L.L.C.: 2,839,600 Shares D. E. Shaw & Co., L.P.: 2,839,600 Shares D. E. Shaw & Co., L.L.C.: 2,839,600 Shares David E. Shaw: 2,839,600 Shares (i) Sole power to dispose or to direct the disposition of:

D. E. Shaw Laminar Portfolios, L.L.C.: -0- D. E. Shaw & Co., L.P.: -0- D. E. Shaw & Co., L.L.C.: -0- David E. Shaw: -0- (ii) Shared power to dispose or to direct the disposition of: D. E. Shaw Laminar Portfolios, L.L.C.: 2,839,600 Shares D. E. Shaw & Co., L.P.: 2,839,600 Shares D. E. Shaw & Co., L.L.C.: 2,839,600 Shares David E. Shaw: 2,839,600 Shares David Shaw does not own any Shares directly. By virtue of David Shaw's position as President and sole shareholder of D. E. Shaw & Co., Inc., which is the general partner of D. E. Shaw & Co., L.P., which in turn is the investment adviser of D. E. Shaw Laminar Portfolios, L.L.C., and by virtue of David Shaw's position as President and sole shareholder of D. E. Shaw & Co. II, Inc., which is the managing member of D. E. Shaw & Co., L.L.C., which in turn is the managing member of D. E. Shaw Laminar Portfolios, L.L.C., David Shaw may be deemed to have the shared power to vote or direct the vote of, and the shared power to dispose or direct the disposition of, the 2,839,600 Shares owned by D. E. Shaw Laminar Portfolios, L.L.C., constituting 6.6% of the outstanding Shares and, therefore, David Shaw may be deemed to be the beneficial owner of such Shares. David Shaw disclaims beneficial ownership of such 2,839,600 Shares. Item 5 Ownership of Five Percent or Less of a Class: --------------------------------------------- If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following. [ ] Item 6 Ownership of More than Five Percent on Behalf of Another -------------------------------------------------------- Person: ------- Not Applicable

Item 7 Identification and Classification of the Subsidiary Which --------------------------------------------------------- Acquired the Security Being Reported on By the Parent ----------------------------------------------------- Holding Company: ---------------- Not Applicable Item 8 Identification and Classification of Members of the Group: ---------------------------------------------------------- Not Applicable Item 9 Notice of Dissolution of Group: ------------------------------- Not Applicable Item 10 Certification: -------------- By signing below, each of D. E. Shaw Laminar Portfolios, L.L.C., D. E. Shaw & Co., L.P., D. E. Shaw & Co., L.L.C., and David Shaw certify that, to the best of such reporting person's knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having such purposes or effect.

SIGNATURE --------- After reasonable inquiry and to the best of their knowledge and belief, the undersigned certify that the information set forth in this statement is true, complete, and correct. Powers of Attorney, dated February 24, 2004 granted by David E. Shaw in favor of Julius Gaudio, are attached hereto. Dated: December 28, 2004 D. E. Shaw Laminar Portfolios, L.L.C. By: D. E. Shaw & Co., L.L.C., as managing member By: /s/ Julius Gaudio ------------------------------ Julius Gaudio Managing Director D. E. Shaw & Co., L.P. By: /s/ Julius Gaudio ------------------------------ Julius Gaudio Managing Director D. E. Shaw & Co., L.L.C. By: /s/ Julius Gaudio ------------------------------ Julius Gaudio Managing Director David E. Shaw By: /s/ Julius Gaudio ------------------------------ Julius Gaudio Attorney-in-Fact for David E. Shaw


                                    Exhibit 1
                                    ---------

                                POWER OF ATTORNEY
                               FOR CERTAIN FILINGS
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934


I, David E. Shaw, hereby make, constitute and appoint each of:


     Anne Dinning,

     Julius Gaudio,

     Lou Salkind,

     Stuart Steckler, and

     Eric Wepsic,

acting individually, as my agent and attorney-in-fact, with full power of
substitution, for the purpose of, from time to time, executing in my name and/or
my capacity as President of D. E. Shaw & Co., Inc. (acting for itself or as the
general partner of D. E. Shaw & Co., L. P. and general partner or managing
member of other entities, any which in turn may be acting for itself or other
entities) all documents, certificates, instruments, statement, other filings,
and amendments to the forgoing (collectively, "documents") determined by such
person to be necessary or appropriate to comply with ownership or control-person
reporting requirements imposed by any United States or non-United States
governmental or regulatory authority, including without limitation Forms 3, 4,
5, 13D, 13F, and 13G required to be filed with the Securities and Exchange
Commission; and delivering, furnishing or filing any such documents with the
appropriate governmental or regulatory authority. Any such determination shall
be conclusively evidenced by such person's execution, delivery, furnishing,
and/or filing of the applicable document.

This power of attorney shall be valid from the date hereof and replaces the
power granted on February 5, 2001, which is hereby cancelled.

IN WITNESS HEREOF, I have executed this instrument as of the date set forth
below.

Date: February 24, 2004

DAVID E. SHAW, as President of
D. E. Shaw & Co., Inc.
/s/David E. Shaw
New York, New York


                                    Exhibit 2
                                    ---------

                                POWER OF ATTORNEY
                               FOR CERTAIN FILINGS
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934


I, David E. Shaw, hereby make, constitute and appoint each of:

     Anne Dinning,

     Julius Gaudio,

     Lou Salkind,

     Stuart Steckler, and

     Eric Wepsic,

acting individually, as my agent and attorney-in-fact, with full power of
substitution, for the purpose of, from time to time, executing in my name and/or
my capacity as President of D. E. Shaw & Co. II, Inc. (acting for itself and as
the managing member of D. E. Shaw & Co., L.L.C., which in turn may be acting for
itself or as the managing member of other companies) all documents,
certificates, instruments, statement, other filings and amendments to the
forgoing (collectively, "documents") determined by such person to be necessary
or appropriate to comply with ownership or control-person reporting requirements
imposed by any United States or non-United States governmental or regulatory
authority, including without limitation Forms 3, 4, 5, 13D, 13F and 13G required
to be filed with the Securities and Exchange Commission; and delivering,
furnishing or filing any such documents with the appropriate governmental or
regulatory authority. Any such determination shall be conclusively evidenced by
such person's execution and delivery, furnishing or filing of the applicable
document.

This power of attorney shall be valid from the date hereof and replaces the
power granted on February 5, 2001, which is hereby cancelled.

IN WITNESS HEREOF, I have executed this instrument as of the date set forth
below.

Date:  February 24, 2004

DAVID E. SHAW, as President of
D. E. Shaw & Co. II, Inc.
/s/David E. Shaw
New York, New York


                                    Exhibit 3
                                    ---------

                             JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934,
as amended, each of the undersigned Reporting Persons hereby agrees to the joint
filing, along with all other such Reporting Persons, on behalf of each of them
of a statement on Schedule 13G (including amendments thereto) with respect to
the Common Stock, $0.10 par value, of USG Corporation, and that this Agreement
be included as an Exhibit to such joint filing. This Agreement may be executed
in any number of counterparts, all of which taken together shall constitute one
and the same instrument.

IN WITNESS WHEREOF, each of the undersigned hereby executes this Agreement as of
this 28th day of December, 2004.

                                        D. E. Shaw Laminar Portfolios, L.L.C.

                                        By: D. E. Shaw & Co., L.L.C., as
                                            managing member

                                            By: /s/ Julius Gaudio
                                                ------------------------------
                                                Julius Gaudio
                                                Managing Director


                                        D. E. Shaw & Co., L.P.

                                        By: /s/ Julius Gaudio
                                            ------------------------------
                                            Julius Gaudio
                                            Managing Director


                                        D. E. Shaw & Co., L.L.C.

                                        By: /s/ Julius Gaudio
                                            ------------------------------
                                            Julius Gaudio
                                            Managing Director


                                        David E. Shaw

                                        By: /s/ Julius Gaudio
                                            ------------------------------
                                            Julius Gaudio
                                            Attorney-in-Fact for David E. Shaw