In southwestern Dallas County, in the vicinity of Redfield and for several miles farther east along the Raccoon River, there are exposures of sandstones and shales of the Des Moines series. These were studied by Leonard who concluded that the strata were not flat lying nor with a gentle southwest dip, but assumed the form of an anticline of presumably north-south axis in the vicinity of Redfield. He based this conclusion upon an apparent rise of a prominent sandstone member along the Raccoon River west toward Redfield, upon the non-appearance, at Redfield, of beds found in sections east and west along the river, and upon the presence of fracture cleavage in one of the outcrops of the sandstone.
Proceedings of the Iowa Academy of Science
©1933 Iowa Academy of Science, Inc.
Gwynne, C. S.
"Structure of the Des Moines Series at Redfield, Iowa,"
Proceedings of the Iowa Academy of Science, 40(1), 127-130.
Available at: https://scholarworks.uni.edu/pias/vol40/iss1/61