Pyrite crystals found in the Waldron Shale of Clark County Indiana. It is from the Silurian Period.

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. ...