The Hoploscaphites nicoletti ammonite fossil from the Late Cretaceous (68-65 million years ago). Found in South Dakota. On display at th...

The Parkinsonia dorsetensis ammonite fossil from the Middle Jurassic (174-164 million years ago). Found in England. On display at the Smi...

This is an interesting fossil in that it is pyritized and a horn coral. The identification appears to be Amplexus fragilis (White & S...