358.9 million years, Crinoids Fossils, Platycrinites Saffordi, Mississippian, fossil

Sugarland, Texas Museum of Natural Science.

Crinoids, Platycrinites Saffordi, Mississippian 358.9 million years ago
Indiana, USA

The Edwardsville Formation was named by Stockdale (1931, p. 220) for Edwardsville, Floyd County, Ind. The type section is along former Indiana Highway 62 a short distance northeast of the town near the center of the NE¼ sec. 1, T. 3 S., R. 5 E. Stockdale included strata between his Floyds Knob Formation below and his Harrodsburg Limestone above. The latter included the Ramp Creek as its basal member. The Floyds Knob was later designated as the basal member of the Edwardsville, and the Ramp Creek was given formational status (Nicoll and Rexroad, 1975, p. 3). The Edwardsville of present usage overlies the Spickert Knob Formation and underlies the Ramp Creek Formation. (See "Borden Group" for a discussion of obsolete terms that have been applied to this stratigraphic interval.
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