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The AAPG/Datapages Combined Publications Database
Utah Geological Association
Abstract
Geologic Summary of the Crawford Mountains, Rich County, Utah, and Lincoln County, Wyoming
Abstract
The Crawford Mountains are an exposed model of the type of structural trap that formed the prolific Whitney Canyon and Hogback petroleum fields. This exposed-trap model differs from the Whitney Canyon and Hogback structures in age of rock involved and presence of a listric fault.
The Crawford thrust has a high-angle attitude along the east side of the mountain. Rocks on the up-thrown side become progressively younger southward. The Crawford thrust may die out a short distance to the south or terminate against a suspected east-west strike-slip fault at the southern end of the range.
It is the proximity to the organic-rich Cretaceous rocks and the formation of subsurface overthrust ramp anticlines with fractured porosity that produces such fields as Whitney Canyon.
Listric fault development is coincident to a prior imbricate thrust fault and this listric movement forms the prominent scarp on the west side of the Crawford Mountains.
Nearly 26,000 feet of strata are exposed in and near the Crawford Mountains. Much of the same strata as the productive section in the Whitney Canyon field is well exposed in the mountains proper.
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