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Some Middle Cenomanian (Upper Cretaceous) Acanthoceratid Ammonites from the western interior of the United States /

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Bibliographic Details
Main Author: Cobban, William A., 1916-2015 (Author)
Format: Government Document eBook
Language:English
Published: Washington : Department of the Interior, U.S. Geological Survey, 1987.
Series:U.S. Geological Survey professional paper ; 1445.
Subjects:
Acanthoceratidae > Frontier Formation.
Ammonoidea > Frontier Formation.
Paleontology > Cretaceous.
Paleontology > United States.
Acanthoceratidae.
Cretaceous Geologic Period.
Paleontology.
United States.
From 65 to 140 million years ago
Online Access:https://purl.fdlp.gov/GPO/gpo105875
Description
Item Description:"Ammonites of the genera Calycoceras, Acanthoceras, Plesiacanthoceras, and Protacanthoceras from the Frontier Formation and equivalent rocks are described and illustrated."
Also available online in PDF format from the U.S. Geological Survey Warehouse (http:/pubs.er.usgs.gov/).
Physical Description:1 online resource (iv, 28 pages) : illustrations, maps.
Bibliography:Includes bibliographical references (pages 24-26) and index.