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Document Type

Research

Keywords

Mississippian Crinoids, Iowa Crinoids, Crinoids

Abstract

Iowa Mississippian rocks, rich in fossil crinoidea, lend themselves excellently for stratigraphic zonation. Zone index fossils have been chosen in the basis of stage of evolution and abundance of occurrence. The following crinoid zones are established: North Hill formation, Aacocrinus chouteauensis (Miller), Hampton formation, Rhodocrinites kirbyi (Wachsmuth and Springer), Gilmore City formation, Rhodocrinites serpens (Laudon), Burlington formation, Dolbe Creek member, Cactocrinus proboscidialis (Hall), Haight Creek member, Agaricocrinus planoconvexus Hall, Cedar Fork member, lower part, Azygocrinus rotundus (Yandell and Shumard), upper part, Dorycrinus quinquelobus (Hall), Keokuk formation, transition beds, Eutrochocrinus trochiscus (Meek and Worthen), main limestone unit, Actinocrinites lowei (Hall), Warsaw formation, Barycrinus spurius (Hall), St. Louis formation, Dichocrinus omatus Wachsmuth and Springer and Ste. Genevieve formation, Taxocrinus huntsvillae Springer.

Publication Date

March 1973

Journal Title

Proceedings of the Iowa Academy of Science

Volume

80

Issue

1

First Page

25

Last Page

33

Copyright

© Copyright 1973 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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