Exhibit
23.4
CONSENT OF INDEPENDENT PETROLEUM ENGINEERS AND
GEOLOGISTS
The
undersigned hereby consents to the references to our firm in the form and
context in which they appear in the Annual Report on Form 10-K of St. Mary Land
& Exploration Company for the year ended December 31, 2009. We
further consent to the incorporation by reference thereof into this Registration
Statement on Form S-8.
NETHERLAND,
SEWELL & ASSOCIATES, INC.
By: /s/
THOMAS J. TELLA II
Thomas J. Tella II, P.E.
Senior Vice President
Dallas,
Texas
March 26,
2010