This image shows what appears to be a Pterinea brisa? pelecypod fossil. It was found in the Silurian age Waldron Shale layer of Clark Co...

Fossil shown appears to be some sort of species of Glyptocrinus or Glyptaster crinoid. Specimen was found in the Silurian Waldron Shale ...

This crinoid calyx fossil is not identified. It was found in southern Indiana and is from the Mississippian Period. For reference, the Coc...