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The Upper Cretaceous dimorphic pachydiscid ammonite Menuites in the Western Interior of the United States

Abstract:
Highly dimorphic pachydiscid ammonites are fairly abundant in Montana, South Dakota, Wyoming, and Colorado, and a few specimens are known from Utah and New Mexico. Two chronologic species are recognized, each represented by small adults (microconchs) and large adults (macroconchs). Microconchs have been assigned to Menuites Spath, 1922, whereas macroconchs have usually been assigned to Anapachydiscus Yabe and Shimizu, 1926. Both forms are considered Menuites in the present report. -from Authors

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Institution:
University of Oxford
Division:
MPLS
Department:
Earth Sciences
Role:
Author
Journal:
US Geological Survey Professional Paper More from this journal
Volume:
1533
Publication date:
1993-01-01
ISSN:
1044-9612
Language:
English
Pubs id:
pubs:177792
UUID:
uuid:04762706-9f6f-4a04-91b9-6a2804db5858
Local pid:
pubs:177792
Source identifiers:
177792
Deposit date:
2013-02-20

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