Exhibit
23.1
CONSENT
OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We
consent to the incorporation by reference in this Registration Statement on Form
S-8 of our reports dated February 21, 2008, relating to the financial statements
(which report expresses an unqualified opinion and includes an explanatory
paragraph for the change in method of accounting and disclosure for stock based
compensation and defined benefit plans in 2006) of St. Mary Land &
Exploration Company and the effectiveness of St. Mary Land & Exploration
Company’s internal control over financial reporting appearing in the Annual
Report on Form 10-K/A of St. Mary Land & Exploration Company for the year
ended December 31, 2007.
/s/
DELOITTE & TOUCHE LLP
Denver,
Colorado
June 18,
2008