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

Abstract

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 thrustmore » sheet.« less

Authors:
;
Publication Date:
Research Org.:
Univ. of Akron, OH
OSTI Identifier:
7230263
Resource Type:
Conference
Journal Name:
Am. Assoc. Pet. Geol., Bull.; (United States)
Additional Journal Information:
Journal Volume: 70:8
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 03 NATURAL GAS; WYOMING; ANTICLINES; GEOLOGIC FAULTS; PETROLEUM GEOLOGY; CRETACEOUS PERIOD; GEOLOGIC FORMATIONS; SANDSTONES; FEDERAL REGION VIII; GEOLOGIC AGES; GEOLOGIC FRACTURES; GEOLOGIC STRUCTURES; GEOLOGY; MESOZOIC ERA; NORTH AMERICA; ROCKS; SEDIMENTARY ROCKS; USA; 020200* - Petroleum- Reserves, Geology, & Exploration; 030200 - Natural Gas- Reserves, Geology, & Exploration

Citation Formats

Berendson, E A, and Burford, A E. Structural relationships of northern and central parts of Emigrant Gap anticline, Natrona County, Wyoming. United States: N. p., 1986. Web.
Berendson, E A, & Burford, A E. Structural relationships of northern and central parts of Emigrant Gap anticline, Natrona County, Wyoming. United States.
Berendson, E A, and Burford, A E. Fri . "Structural relationships of northern and central parts of Emigrant Gap anticline, Natrona County, Wyoming". United States.
@article{osti_7230263,
title = {Structural relationships of northern and central parts of Emigrant Gap anticline, Natrona County, Wyoming},
author = {Berendson, E A and Burford, A E},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/7230263}, journal = {Am. Assoc. Pet. Geol., Bull.; (United States)},
number = ,
volume = 70:8,
place = {United States},
year = {1986},
month = {8}
}

Conference:
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