Fossils at Año Nuevo Point, California

Fossil rock-boring clams (pholads) in the wave-cut bench of a marine terrace dated to ~80,000 years by U-series methods on corals (Muhs, D.R., Simmons, K.R., Kennedy, G.L., Ludwig, K.R., and Groves, L.T., 2006, A cool eastern Pacific Ocean at the close of the last interglacial complex: Quaternary Science Reviews, v. 25, p. 235-262).