Exhibit 99.1

                    CERTIFICATION OF CHIEF EXECUTIVE OFFICER
                                   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 March
31, 2003 as filed with the Securities and Exchange Commission on the date hereof
(the "Report"), I, Mark A. Hellerstein, Chief Executive Officer of the Company,
hereby certify, pursuant to and solely for the purpose of 18 U.S.C. ss. 1350, as
adopted pursuant to ss. 906 of the Sarbanes-Oxley Act of 2002, to the best of my
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
May 14, 2003



"A signed original of this written statement required by Section 906 has been
provided to St. Mary Land & Exploration Company and will be retained by St.
Mary Land & Exploration Company and furnished to the Securities and Exchange
Commission or its staff upon request."






                    CERTIFICATION OF VICE PRESIDENT - FINANCE
                                   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 March
31, 2003 as filed with the Securities and Exchange Commission on the date hereof
(the "Report"), I, Richard C. Norris, Vice President - Finance of the Company,
hereby certify, pursuant to and solely for the purpose of 18 U.S.C. ss. 1350, as
adopted pursuant to ss. 906 of the Sarbanes-Oxley Act of 2002, to the best of my
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/ RICHARD C. NORRIS
- ---------------------
 Richard C. Norris
Vice President - Finance
(principal financial officer)
May 14, 2003


"A signed original of this written statement required by Section 906 has been
provided to St. Mary Land & Exploration Company and will be retained by St.
Mary Land & Exploration Company and furnished to the Securities and Exchange
Commission or its staff upon request."