The Mississippian series includes all the rocks lying between the base of the coal measures and the top of the Devonian. They have been principally studied in southeastern Iowa and adjacent portions of neighboring states. More recently the study of the exposures of that portion of central Iowa which includes Marion, Mahaska, Keokuk, and Washington Counties has allowed the construction of a central Iowa section.
Proceedings of the Iowa Academy of Sciences
©1894 Iowa Academy of Science, Inc.
Bain, H. Foster
"Mississippian Rocks of Central Iowa,"
Proceedings of the Iowa Academy of Science, 2(1), 174-174.
Available at: https://scholarworks.uni.edu/pias/vol2/iss1/36