We
consent to the incorporation by reference in this Registration Statement on Form
S-8 of our reports dated February 23, 2010, relating to the consolidated
financial statements of St. Mary Land & Exploration Company (which report
expresses an unqualified opinion and includes explanatory paragraphs regarding
the Company’s adoption of new accounting standards) and the effectiveness of St.
Mary Land & Exploration Company’s internal control over financial reporting
appearing in the Annual Report on Form 10-K of St. Mary Land & Exploration
Company for the year ended December 31, 2009.