Geological Structure and Relations of the Coal-Bearing Strata of Central Iowa

Authors

Charles R. KeyesFollow

Document Type

Research

Abstract

The exposed stratified rocks of central Iowa are made up chiefly of Lower Coal Measure clays, shales and sandstone. In the southeastern portion of the area the upper member (for Iowa) of the Sub-Carboniferous – The St. Louis limestone – is exposed along the Des Moines River. To the westward the socalled Middle Coal Measures and the Upper Coal Measures are represented. Hitherto it has been supposed that the three recognized divisions of the upper Carboniferous rocks in the State have each a maximum thickness of about two hundred feet. Lately, however, the Upper Coal Measures alone have been discovered to have at least double this estimate; and at a still later date the vertical extent of the other two formations has been found to differ very much from the limit usually assigned: the Middle Coal Measures being considerably thinner than was supposed, and the Lower Coal Measures very much thicker.

Publication Date

1890

Journal Title

Proceedings of the Iowa Academy of Sciences

Volume

1

Issue

Pt. 2

First Page

27

Last Page

28

Copyright

©1890 Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

Recommended Citation

Keyes, Charles R. (1890) "Geological Structure and Relations of the Coal-Bearing Strata of Central Iowa," Proceedings of the Iowa Academy of Science, 1(Pt. 2), 27-28.
Available at: https://scholarworks.uni.edu/pias/vol1/iss2/16