The Ash Creek oil field is located in the northernmost part of Sheridan County, Wyoming. Discovered in April, 1952, the field had seven producing wells as of January, 1953, and development drilling was continuing as of that date. The wells produce from an Upper Cretaceous sandstone 20 feet thick at a depth of approximately 4,700 feet. Production from the field has been curtailed to less than 100 barrels per day pending completion of arrangements to transport the oil. The oil accumulation is the result of a structural trap consisting of a broad, plunging nose cut by a transverse zone of normal faulting. The exploration methods used in mapping the geology of this area include photogeology, surface geologic mapping, seismic work, core drilling, and wildcat drilling.

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