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Authors

Charles Keyes

Document Type

Research

Abstract

From the angle of genesis we lately have to modify some of our ideas on our Glacial till-sheets. Realizing that the continental ice-masses do not emanate from a single center, it is found that our Iowa tills come from what is known as the Keewatin center, on the west of Hudson Bay; while the tills on the east side of the Mississippi River originated mainly from the Labradoran center. The only invasion of ice from the last mentioned center is a slight one by the Illinoian ice, in the extreme southeastern part of our state.

Publication Date

1926

Journal Title

Proceedings of the Iowa Academy of Science

Volume

33

Issue

1

First Page

220

Last Page

220

Copyright

© Copyright 1926 by the Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

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