Home > Iowa Academy of Science > Journals & Newsletters > Proceedings of the Iowa Academy of Science > Volume 32 (1925) > Annual Issue
Document Type
Research
Abstract
Attention is directed to the value of volcanic ash-beds intercalated in other strata as indices to precise correlation of geological terranes. Such ash-beds, when once recognized, are often found to be wide-spread ; and being formed under conditions independent of water-laid basinal deposits pass uninterruptedly from one province to another. At present the most important clue to an horizon of this kind to be looked for in Iowa is an Ordovicic one near the base of the Decorah shales.
Publication Date
1925
Journal Title
Proceedings of the Iowa Academy of Science
Volume
32
Issue
1
First Page
362
Last Page
362
Copyright
©1925 Iowa Academy of Science, Inc.
Language
en
File Format
application/pdf
Recommended Citation
Keyes, Charles
(1925)
"New Method of Precise Geological Correlation,"
Proceedings of the Iowa Academy of Science, 32(1), 362-362.
Available at:
https://scholarworks.uni.edu/pias/vol32/iss1/69