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Authors

Charles Keyes

Document Type

Research

Abstract

For several reasons the section of Cretacic strata in northwestern Iowa is of especial interest. It was in this section, near the mouth of the Big Sioux River, that for the first time in the New World the stratigraphic equivalents of the English Cretacic formations were clearly recognized. In this section true chalk, made up of countless myriads of microscopic organic remains, was first discovered in this country. This section is also a part of the classic locality for the Mid-Cretacic formations of America.

Publication Date

1913

Journal Title

Proceedings of the Iowa Academy of Science

Volume

20

Issue

1

First Page

199

Last Page

201

Copyright

© Copyright 1913 by the Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

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