Here is the calyx (top part of) a crinoid that existed in the Mississippian or Carboniferous Period. This one was found at Lake Cumberland,...

Here is a blastoid called Pentaremites welleri that existed in the Mississippian or Carboniferous Period. This one was found in Indian Spr...

Another view of the trilobite Trimerus delphinocephalus posted yesterday. It is from the Silurian period and was found in Clark County, In...