Periaster sp.
Echinoid
Paleocene
Locatelli Formation
Santa Cruz Mountains, California, USA.

25mm echinoid. Crushed on back, but very rare.

Echinoderm. Echinoid.

Periaster is a genus of sea urchin better known from the Middle Cretaceous (Cenomanian) of France.  Its occurrence in the Paleocene of California greatly extends its chronologic and paleogeographic range.

Rare, off-locality find.