SM Energy (SM) 10-Q 2005 Q3 Quarterly report

EXHIBIT 32.1

CERTIFICATION

PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of St. Mary Land & Exploration Company (the “Company”) for the quarterly period ended September 30, 2005 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Mark A. Hellerstein, as Chief Executive Officer of the Company, and David W. Honeyfield, as Chief Financial Officer of the Company, each hereby certifies, pursuant to and solely for the purpose of 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, to the best of his knowledge and belief, that:

(1)          The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)); and

(2)          The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/S/ MARK A. HELLERSTEIN

Mark A. Hellerstein

Chief Executive Officer

November 2, 2005

/S/ DAVID W. HONEYFIELD

David W. Honeyfield

Chief Financial Officer

November 2, 2005

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