Presentation and discussion of a classification of Cambrian, Ordovician, and Silurian strata recently adopted by the Iowa Geological Survey for use in this state.
Proceedings of the Iowa Academy of Science
©1936 Iowa Academy of Science, Inc.
Trowbridge, A. C.
"Current Early Paleozoic Classification in Iowa,"
Proceedings of the Iowa Academy of Science, 43(1), 250-250.
Available at: https://scholarworks.uni.edu/pias/vol43/iss1/67