Structural relationships of northern and central parts of Emigrant Gap anticline, Natrona County, Wyoming

Conference · Fri Aug 01 04:00:00 EDT 1986 · Am. Assoc. Pet. Geol., Bull.; (United States)

OSTI ID:7230263

Berendson, E A; Burford, A E

Emigrant atGrap anticline lies on the east side of the Casper arch and trends north-northwest in east-central Natrona County, Wyoming, from the western end of Casper Mountain to its plunge south of Petrie Siding, a distance of about 20 mi. Outcrops of Cretaceous Frontier sandstones define or outline the structure, especially its northern and central parts. Surface expression of faulting is minor; some beds are repeated by minor thrusting, and some are offset by small mainly north-northeast strike-slip faults. Joint sets include an approximately horizontal set, a high-angle northeastern set, and a high-angle northwestern set. A fourth high-angle approximately east-west set is prominent only in one area where the anticlinal axis is sinistrally offset almost 2 mi. An unexposed strike-slip/wrench fault is probably present at depth and probably offsets one or more major subsurface thrusts. These include the Owl Creek thrust fault, which extends beneath Pine Mountain, and probably one other east-dipping thrust that has possible surface extension adjacent to the anticline. Emigrant Gap anticline appears to be rootless, having been transported westward as part of a thrust sheet during the Laramide orogeny, the principal compressive stress directed east-northeast to west-southwest. Blind strike-slip or wrench faults probably offset the thrust sheet.

• Research Organization: Univ. of Akron, OH
• OSTI ID: 7230263
• Conference Information: Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 70:8
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
ANTICLINES
CRETACEOUS PERIOD
FEDERAL REGION VIII
GEOLOGIC AGES
GEOLOGIC FAULTS
GEOLOGIC FORMATIONS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
GEOLOGY
MESOZOIC ERA
NORTH AMERICA
PETROLEUM GEOLOGY
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
USA
WYOMING