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Authors

Charles Keyes

Document Type

Research

Abstract

In the last generation or two there appears to have been little advancement made along lines of general geologic correlation. Two controlling reasons stand out prominently. On account of the fact that the criterion of fossils is so largely misused and is so generally unchecked by other critical criteria it is continually losing much of its former precedence. The adoption of the lithologic formation as the cartographic unit is also almost a complete failure for the reason that no account is taken of the change, replacement and effacement of its essential characters from place to place. All this confusion gives rise to an interminable synonymy which even a specialist in a circumscribed region cannot always satisfactorily make out without detailed review of the original sections on the ground.

Publication Date

1915

Journal Title

Proceedings of the Iowa Academy of Science

Volume

22

Issue

1

First Page

268

Last Page

271

Copyright

©1915 Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

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