Most who examined the rocks along the Missouri River in the region under consideration have been constrained to record some folding, but such statements have been rather indefinite and have hardly expressed sufficiently the abruptness of the folds.
Proceedings of the Iowa Academy of Sciences
©1888 Iowa Academy of Science, Inc.
Todd, J. E.
"On the Folding of Carboniferous Strata in Southwestern Iowa,"
Proceedings of the Iowa Academy of Science, 1(Pt. 1), 58-62.
Available at: https://scholarworks.uni.edu/pias/vol1/iss1/28