These pictures are of pieces of the echinoid Archaeocidaris from the Mississippian Period. They were found in the St. Benevieve Formation of...

Some images of a Modiomorpha clam fossil found in the Mahantango Formation, Pennsylvania. This pelecypod existed in the Devonian Period. ...

This is my 500th blog post and to mark this milestone I will post some of the most popular fossils by Internet visits and then post a few im...