San Diego Spanish Bight, hard layer fossiliferous Pleistocene forms beach at foot of bluff. Pacific Beach , slightly tilted San Diego Pliocene sandstone capped by horizontal upper San Pedro gravels. San Diego formation rests on massive gravels and conglomerates at Pacific Beach . Here San Diego has a Pecten expansus and a Opalia varicostata horizon. Foot of 26th st., upper San Pedro formation in lower half of bluff, with Anomia limatula horizon at base and forming low reef on beach. Pliocene, 2 faunal horizons, but one stratigraphic unit.
((I have asked Shi-Kuei Wu to go over this list of taxa and he has made some corrections which I have included if they pertain to spelling. If the taxon has changed because of later revisions, corrections, or synonomies that is noted after the original reference.))
Mollusca Cowries. Cypraea spadicea - brown cowry Erato vitellina , 1/2 in., heavy, smooth, aperture toothed Erato columbella , much smaller, delicate Ovula deflexa , slender- var. barbareuse
{added:} Trivia dolandri , large coffee bean with dorsal caudal in californica, small, no caudal