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GEOREF RECORD

Geologic structure of Saint George District, Washington County, Utah

Carroll Edward Dobbin
Geologic structure of Saint George District, Washington County, Utah
Bulletin of the American Association of Petroleum Geologists (February 1939) 23 (2): 121-144

Abstract

The structural history, geologic structure, and results of deep drilling in an area occupying a structural transition zone between the High Plateaus of Utah and the Basin and Range Province are described. Cambrian quartzite rests unconformably on pre-Cambrian igneous rocks, and is overlain by as much as 20,000 feet of strata, which record frequent oscillations during the Paleozoic and Mesozoic, a period of uplift and erosion just prior to the Cretaceous, a period of orogeny during the late Cretaceous or early Tertiary (Laramide revolution), and post-Laramide thrust and normal faulting down to rather recent time. Major north-trending normal faults, with the downthrow on the west, divide the district into five east-dipping monoclinal blocks. The normal faults are both straight and curved, terminate abruptly, vary in vertical displacement along any one fault surface, and have as much as 4,500 feet of observable stratigraphic displacement. Encouraged by the finding of oil in the small Virgin field 5 miles east and by the presence of anticlinal structure, six deep wells have been drilled in the district without discovering commercial quantities of oil or gas.


ISSN: 0883-9247
Serial Title: Bulletin of the American Association of Petroleum Geologists
Serial Volume: 23
Serial Issue: 2
Title: Geologic structure of Saint George District, Washington County, Utah
Pages: 121-144
Published: 193902
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
Accession Number: 1939-004989
Categories: Areal geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 11 figs. incl. index and geol. maps
N37°00'00" - N42°00'00", W114°04'60" - W109°04'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1939
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