The bottom of this crinoid calyx displays an attractive five plate flower pattern.  This unidentified calyx is from the Upper Mississippi...

The Eucalyptocrinus crassus (Hall, 1863) crinoid calyx with arm fragments and small stem section. Found in the Waldron Shale of Clark Cou...

This calyx fossil was found in the Waldron Shale of Clark County, Indiana.  It is somewhat worn but appears to be some sort of Glyptocrinu...