EXHIBIT
23.3
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, 2005. We hereby
further consent to the use of information contained in our reports, as of
December 31, 2005 setting forth the estimates of revenues from St. Mary Land
& Exploration Company's oil and gas reserves. We further consent to the
incorporation by reference thereof into St. Mary Land & Exploration
Company's Post-Effective Amendment No. 1 to Registration Statement Nos.
333-30055, 333-35352, 333-88780, and 333-106438 on Form S-8 and Registration
Statement Nos. 033-61850 and 333-58273 on Form S-8, and Registration Statement
No. 333-88712 on Form S-3.
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NETHERLAND,
SEWELL
& ASSOCIATES, INC. |
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By: |
/s/ FREDERIC
D. SEWELL |
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Frederic
D. Sewell |
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Chairman
and Chief Executive Officer |
Dallas,
Texas
February
23, 2006