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Authors

Charles Keyes

Document Type

Research

Abstract

The exact stratigraphic relations of, and the exact boundary line between, the latest Devonic formations and the earliest Carbonic rocks of the Mississippi valley north of the Missouri river have long remained some of the unsolved geographic problems. That the question should stand today much as it did 60 years ago is due chiefly to the circumstance that although three state geological surveys have repeatedly attacked it, all the necessary facts were not available in any one state alone. No observer seems to have had the opportunity to make critical investigations in all three of the states or to have gone over all of the ground between the mouth of the Missouri river and the Minnesota line.

Publication Date

1912

Journal Title

Proceedings of the Iowa Academy of Science

Volume

19

Issue

1

First Page

153

Last Page

156

Copyright

© Copyright 1912 by the Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

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