Scytalocrinus robustus Crinoid Fossil

 

This picture is of a crinoid calyx fossil called Scytalocrinus robustus (Hall, 1861). Picture was taken in 2016 at Indiana University Department of Geology. The fossil dates to the Middle Mississippian Period and was found in Crawfordsville, Indiana USA (Edwardsville formation; Valmeyeran series). Thanks to Kenny for the picture.