These microfossils were found in screenings obtained by washing some marly shales from the Cerro Gordo member of the Upper Devonian of Floyd County, Iowa. They belong to the genus Endothyra which is abundantly represented in the overlying Mississippian strata.
Proceedings of the Iowa Academy of Science
©1929 Iowa Academy of Science, Inc.
Thomas, A. O.
"Foraminifera in the Iowa Devonian,"
Proceedings of the Iowa Academy of Science, 36(1), 279-280.
Available at: https://scholarworks.uni.edu/pias/vol36/iss1/71