This fossil appears to be the bottom of a Lyriocrinus calyx cup found in the Waldron Shale of Clark County, Indiana. It is dated to th...

This image shows a Cryptolithus tessellatus fragment found years ago.  It existed in the Ordovician Period. The fossil plate was found ...

Previously images of an unprepped Cheirurus niagarensis  trilobite pygidium was shown (see this post ).  Recently, the fossil was cleaned...