Clypeasteroida (sand dollars)

Clypeasteroida

Clypeasteroids (sand dollars) comprise species of generally flattened, burrowing sea urchins. They are known from the Late Palaeocene to the Recent and found worldwide.

Astrodapsis antiselli

Astrodapsis davisi

Astrodapsis spatiosus

Astrodapsis whitneyi
 Santa Margarita FormationDendraster ashleyi Dendraster diegoensisDendraster diegoensis Dendraster venturaensisDendraster venturaensis  Dendraster vizcainoensisDendraster vizcainoensis
 Santa Margarita_Kewia fairbanksiKewia fairbanksi

Relevant literature

Arnold, R. (1908). Descriptions of new Cretaceous and Tertiary fossils from the Santa Cruz Mountains. California. Proceedings of the U.S. National Museum 34.

Kew, W. S. W. (1920). Cretaceous and Cenozoic Echinoidea of the Pacific Coast of North America. University of California Publications in Geological Sciences 12, pp. 23-236.