Paleoenvironments of Upper Cretaceous Lewis Shale and Fox Hills Formation, south-central Wyoming

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6127732

Perman, R C

The Maestrichtian Lewis Shale and Fox Hills Formation in south-central Wyoming were deposited during the final major transgression and regression of the North American epicontinental sea. Outcrops of these formations were examined along the margins of the Great Divide, Washakie, Hanna, and Carbon basins. Bore-hole logs from approximately 200 wells within these basins were studied and correlated with outcrops. Lists of fossils from nearly 300 localities were compiled to obtain information on paleoenvironments and to identify stratigraphic positions of fossils indicating ages of the formations. The Lewis Shale is divided into lower and upper, predominantly shale members and the intervening Dad Sandstone Member. The lower shale member contains mostly deep-water marine facies, except in the Hanna basin where it contains sandstone units representing barrier bar facies. The Dad Sandstone was deposited in deep-water to marginal marine environments. Sandstone and interbedded shale units include prodelta turbidite facies, storm-deposited delta front facies, and barrier bar/lagoon facies. The upper shale member represents relatively shallow-water shoreface and delta front facies.

• OSTI ID: 6127732
• Report Number(s): CONF-880301-
• Country of Publication: United States
• Language: English

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02 PETROLEUM
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CAVITIES
COASTAL REGIONS
COMPARATIVE EVALUATIONS
CRETACEOUS PERIOD
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WELL LOGGING
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