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Friday, July 29, 2011

Source of Crinoidal Limestone near Logan Ohio

Conodonts from the Rushville Formation (Mississippian) of Ohio
Thomas L. Thompson, Nelson S. Ford and Walter C. Sweet
Journal of Paleontology
Vol. 45, No. 4 (Jul., 1971), pp. 704-712
(article consists of 10 pages)
Stable URL: http://www.jstor.org/stable/1302807

Article Abstract:

Representatives of 17 form species of nine conodont form genera have been recovered from a one foot limestone bed at, or near, the base of the Mississippian Rushville Formation in its type section in Perry County, Ohio. Regional and stratigraphic distribution of the conodont form species indicate that the basal Rushville is mid-early Osagean in age, and that it belongs in the Doliognathus latus Subzone of the Bactrognathus-Pseudopolygnathus multistriatus Zone. A majority of Rushville conodonts are referable to known species; however, one form species, Gnathodus reversus n. sp., is described and illustrated for the first time.

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