FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL OMB Number: 3235-0287 Expires: January 31, 2005 Estimated average burden hours per response... 0.5

(Print or Type Responses)

1. Name and Address of Reporting Person * YORK DOUGLAS W   2. Issuer Name and Ticker or Trading Symbol ST MARY LAND & EXPLORATION CO [SM] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Exec. VP & COO (Last) (First) (Middle) 1776 LINCOLN ST, STE 700 3. Date of Earliest Transaction (Month/Day/Year) 05/19/2005 (Street) DENVER, CO 80202 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock; $.01 Par Value 05/19/2005   M   5,828 A $ 16.6562 18,324 D   Common Stock; $.01 Par Value 05/19/2005   S   5,828 (1) D $ 25 12,496 D   Common Stock; $.01 Par Value 05/19/2005   M   11,436 A $ 7.965 23,932 D   Common Stock; $.01 par Value 05/19/2005   S   11,436 (2) D $ 25 12,496 D   Common Stock; $.01 Par Value 05/19/2005   M   11,436 A $ 10.595 23,932 D   Common Stock; $.01 Par Value 05/19/2005   S   11,436 (3) D $ 25 12,496 D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
	Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.		SEC 1474 (9-02)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Stock Option (Right-To-Buy)

$ 16.6562

05/19/2005

M

5,828

12/31/2000

12/31/2010

Common Stock

5,828

$ 0

0

D

Stock Option (Right-To-Buy)

$ 7.96

05/19/2005

M

11,436

09/30/2001

09/30/2011

Common Stock

11,436

$ 0

0

D

Stock Option (Right-To-Buy)

$ 10.595

05/19/2005

M

11,436

12/31/2001

12/31/2011

Common Stock

11,436

$ 0

0

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
YORK DOUGLAS W 1776 LINCOLN ST STE 700 DENVER, CO 80202			Exec. VP & COO

Signatures

Brenda L Schohn ( Attorney-In-Fact)		05/23/2005
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	This sales reported in this Form 4 were affected pursuant to a Rule 10b-1 sales plan adopted by the reporting person on May 16, 2005
(2)	This sales reported in this Form 4 were affected pursuant to a Rule 10b-1 sales plan adopted by the reporting person on May 16, 2005
(3)	This sales reported in this Form 4 were affected pursuant to a Rule 10b-1 sales plan adopted by the reporting person on May 16, 2005

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.