In the process of road-making west of Middle Amana, in 1931, the grader exposed the country rock beneath the drift for a distance of about one mile on the north side of the road. The beds consist of shales with calcareous layers interbedded. They carry an abundant Brachiopod fauna with crinoid stems and a few cup corals and gastropods. This fauna seems to be practically identical with that of the Independence shales of Buchanan County, and bears the same remarkable relationship to the Lime Creek fauna that the Independence does.
Proceedings of the Iowa Academy of Science
©1933 Iowa Academy of Science, Inc.
Stookey, S. W.
"Status of the Devonian Beds at Middle Amana,"
Proceedings of the Iowa Academy of Science, 40(1), 133-134.
Available at: https://scholarworks.uni.edu/pias/vol40/iss1/64