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Document Type

Research

Abstract

The existing geological maps of Iowa show a continuous blanket of Cretaceous rocks underlying the glacial drift of northwest Iowa. Previous workers have recognized that the Cretaceous was not continuous under the drift and might have a very irregular distribution along the borders as mapped. As a result of over two years of extensive sub-surface studies, assisted during the last nine months by H. G. Hershey, considerable revision of the boundaries of the Cretaceous has been made.

Publication Date

1937

Journal Title

Proceedings of the Iowa Academy of Science

Volume

44

Issue

1

First Page

133

Last Page

134

Copyright

© Copyright 1937 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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