.35" Edrioasteroid On Brachiopod - Kentucky

This is a Edrioasteroid fossil) preserved on top of a brachiopod fossil from the Ordovician of Kentucky. From an old collection.

Edrioasteroids are an extinct class of echinoderms that lived from the Ediacaran until the Permian, about 300 million years ago. The living animal would have resembled a pentamerously symmetrical disc or cushion.