Monday, August 29, 2011

Eucalyptocrinites Calyx... Almost Intact

A fossil crinoid calyx about the size of grape. It needs some cleaning but appears to be at least 75% intact. This specimen is an index fossil for the Waldron Shale of the Middle Silurian Period (425-420 million years ago).  Eucalyptocrinites crassus? found in Clark County, Indiana.