This picture is of  what I think is a  Paraconularia missouriensis?  (Swallow, 1860) fossil. It existed in the Mississippian Period. The f...

  These are pictures of a clam fossil called  Cypricardina scitula (Herrick). It existed in the Mississippian Period. The fossil was found i...

  Above is an image of a seed fern plant fossil called  Odontopteris aequalis.  This plant fossil dates to the Carboniferous (Pennsylvanian)...