The heteromorph ammonite Didymoceras cochleatum (Meek and Hayden, 1858), from the Pierre Shale of South Dakota and Wyoming

Related Titles

Series: American Museum novitates, no. 3268

By

Kennedy, W. J. (William James)

Cobban, William Aubrey, 1916-
Landman, Neil H.

Type

Book

Material

Published material

Publication info

New York, NY, American Museum of Natural History, c1999

Notes

Title from caption.

"August 10, 1999."

"The middle Campanian (Upper Cretaceous) zone of Baculites gregoryensis Cobban, 1951 in south-central South Dakota and eastern Wyoming has yielded numerous fragments of a distinctive species of Didymoceras characterized by initial loose planispiral whorls followed by loose helical whorls, and finally by a slightly pendant body chamber. These fragments are referred to Didymoceras cochleatum (Meek and Hayden, 1858), a species based on one-half of a septate whorl from the helical growth stage. This species is abundant in the Gregory Member of the Pierre Shale along the Missouri River Valley in South Dakota, rare in the Red Bird Silty Member of the Pierre Shale in eastern Wyoming, and very rare in the Rock River Formation in southeastern Wyoming"--P. [1].

Subjects

Ammonoidea , Cretaceous , Didymoceras cochleatum , Mollusks, Fossil , Niobrara County , Paleontology , Pierre Shale , South Dakota , Wyoming

Call Number

QL1 .A436 no.3268, 1999

Language

English

Identifiers

OCLC: 42241133