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Origin of the Mowry shale

John C. Davis
Origin of the Mowry shale
Contributions to Geology (1963) 2 (2): 135-146


The Mowry Shale is a hard, highly siliceous black shale which is stratigraphically the highest Lower Cretaceous formation in Wyoming. W. W. Rubey has suggested that the Mowry Shale originated as an altered volcanic ash, basing his ideas on a similarity between chemical analyses of the Mowry and analyses of bentonite. More recent analyses indicate that this similarity does not exist, and that the Mowry is the result of normal marine sedimentation. The presence of siliceous radiolarian tests and the absence of volcanic glass shards suggests that excess silica in the Mowry was derived from organisms and not from ash.

ISSN: 0010-7980
Serial Title: Contributions to Geology
Serial Volume: 2
Serial Issue: 2
Title: Origin of the Mowry shale
Author(s): Davis, John C.
Pages: 135-146
Published: 1963
Text Language: English
Publisher: University of Wyoming, Laramie, WY, United States
Accession Number: 1963-012275
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus., table
N41°00'00" - N45°00'00", W111°04'60" - W104°04'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1963
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