Parkinsonia dorsetensis Ammonite

The Parkinsonia dorsetensis ammonite fossil from the Middle Jurassic (174-164 million years ago). Found in England. On display at the Smithsonian National Museum of Natural History.

Pyritized Horn Coral - Amplexus fragilis

This is an interesting fossil in that it is pyritized and a horn coral. The identification appears to be Amplexus fragilis (White & St. John) of the Coral Ridge fauna, New Providence Shale of Jefferson County, Kentucky. Time period for this specimen is Middle Mississippian (Osagean).

Thanks to Alan for trading for this fossil.

Productus wortheni Brachiopod

This brachiopod fossil appears to be an Productus wortheni found in the Keokuk formation of Floyd County, Indiana.  The fossil is from the Mississippian Period. Thanks to Kenny for letting me photograph it.