This small gastropod was found embedded within limestone in what I now call my limestone pile. As I collect limestone from the surrounding hillsides, The pieces I can carry end up here. There are over 62,000 species of gastropods, and they first appear during the early Cambrian period of time.
Update: This may be Euphemites. Examples from the Pennsylvanian Atlas of Life. Euphemites is a genus of the Bellerophontidae family. It is firmly within the Mollusca Phylum, but exact taxonomy is not universally agreed upon. I will likely have a lot of unidentified pieces. This includes many brachiopods, as they