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Authors

Charles Keyes

Document Type

Research

Abstract

Iowa has been repeatedly and so thoroughly planed off and worked over by continental glaciers of no less than five great ice-invasions that it could be hardly expected that any remnants of the softer pre-glacial formations, if there ever were any deposited within the state's boundaries, would survive. Moreover, the state is now everywhere so deeply covered by the several till-sheets and the vast eolian soil-mantles as to effectually conceal all traces of the existence of pre-glacial deposits which we ordinarily refer to the Tertiaries.

Publication Date

1913

Journal Title

Proceedings of the Iowa Academy of Science

Volume

20

Issue

1

First Page

202

Last Page

202

Copyright

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

Language

en

File Format

application/pdf

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