This crinoid calyx fossil is called Macrocrinus mundulus (Hall). It dates to the Mississippian Period and was found Keokuk of Warsaw, Ill...

This fossil is part of the Indiana University Department of Geology collection. It appears to be a Paraconularia missouriensis (Swallow)...

This large fossil plate contains the remains of the crinoid Pentacrinus briareus. It was found in Lyme Regis, county Dorset, England. The...