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Document Type

Research

Abstract

This study originated in the attempt to identify a number of Rhynchotremas and Zygospiras from the Plattin and Decorah formations of Ste. Genevieve County, Mo. Comparisons were made with sets from several other localities in the Mississippi valley, and thus considerable additional material was examined, involving not only Black River horizons, but the Kimmswick and Maquoketa as well.

Publication Date

1922

Journal Title

Proceedings of the Iowa Academy of Science

Volume

29

Issue

1

First Page

67

Last Page

83

Copyright

©1922 Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

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