These images are of a broken open Platystrophia sp. brachiopod fossil. The picture reveals calcite crystals. This fossil was found in Bull...

Gastropod fossil called Turritella sp. from the Cretaceous Period (about 70 million years ago). It was found near Tupelo, Mississippi. ...

These  Glabrocingulum ellenae   gastropod fossils were found in the Coral Ridge Member of the New Providence Formation of Clark County, ...