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An ichthyosaur skull from the Cretaceous of Wyoming

Alfred Sherwood Romer
An ichthyosaur skull from the Cretaceous of Wyoming
Contributions to Geology (1968) 7 (1): 27-41


An ichthyosaur skull from the Mowry Shale of Wyoming--the only good ichthyosaur skull so far known from the Cretaceous--is described and figured. Study of the well-preserved temporal region leads to the conclusion that the dermal element usually described in ichthyosaur skulls above the quadratojugal is nonexistent; that, hence, the large element bounding the temporal opening is the true squamosal, and the opening is thus of a typical euryapsid pattern. Illustrations of a Liassic ichthyosaur prepared by D. M. S. Watson are appended.

ISSN: 0010-7980
Serial Title: Contributions to Geology
Serial Volume: 7
Serial Issue: 1
Title: An ichthyosaur skull from the Cretaceous of Wyoming
Pages: 27-41
Published: 1968
Text Language: English
Publisher: University of Wyoming, Laramie, WY, United States
Accession Number: 1968-051830
Categories: Vertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
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: 1968
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