Middle Pennsylvanian; Desmoinesian; Madera Formation; Madera County, Colorado; Marion County, Iowa; Crinoidea; Erisocrinidae; Erisocrinus knoxvillensis; Exaetocrinus maderaensis, Pontotocrinus coloradoensis; Erisocrinus typus
Erisocrinus knoxvillensis n. sp. is described from rocks of the Desmoinesian Stage exposed near Knoxville, Marion County, Iowa. Two specimens from the Madera Formation, Desmoinesian Stage, Heurfano Park, Colorado, reported by Tischler, 1963, as belonging to the genus Erisocrinus are described as Exaetocrinus maderaensis n. sp. and Pontotocrinus coloradoensis n. sp. The lectoholotype of Erisocrinus typus Meek & Worthen, type species of the genus, is illustrated.
Proceedings of the Iowa Academy of Science
©1975 Iowa Academy of Science, Inc.
Strimple, H. L.
"Erisocrinids (Crinoidea-Inadunata) from Middle Pennsylvanian Rocks of Iowa and Colorado,"
Proceedings of the Iowa Academy of Science, 82(2), 126-129.
Available at: https://scholarworks.uni.edu/pias/vol82/iss2/14