Thursday, March 13, 2014

Unidentified Waldron Shale Cystoid Fossil

This posting shows a series of images of a brownish fossil found in the Waldron Shale of Clark County, Indiana, USA. At first I thought it might me some sort of crushed crinoid calyx but my cousin suggested it might be some sort of cystoid fossil. It could be similar to the Holocystites found in the Silurian aged Osgood Formation limestone. See Kentucky Paleontology Society web site page on some of these fossils.