Description

Astrodapsis davisi

Late Miocene

Santa Margarita Formation

Ventura County,  CA  USA.

Big 68mm loose echinoid.

Astrodapsis is a genus of extinct sea urchin from the Miocene to Pliocene of California and Mexico.

Many of the easily-accessible sites for Astrodapsis of the past have been built on or posted off-limits.  Loose specimens and clusters of them used to be common sights at shows.