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Tuesday, September 13, 2016

Pterotocrinus Crinoid Fossil


This fossil appears to be a Pterotocrinus rugosus crinoid. The genus Pterotocrinus was named by Sidney Lyon and S.A. Casseday in 1859. It was found in the Indian Springs Shale - Glen Dean Formation of Crawford County Indiana USA. The animal existed in the Mississippian Period.

Thanks to Kenny for letting me take a picture of it.

See more images of crinoids like this at Don R. Chesnut's web page on fossils of the Sloans Valley Member (Paragon Formation).


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