Details on Finding Oyster Fossils: here
Geologic Period: Pleistocene Period, around 83-49 ka
More on the geology and vertebrate fossils found in the area: (scientific paper)
Geology of the Area:
The area contains Cenezoic marine strata, which is part of the Temblor Formation.
In the cliffside just off the road are clams, sand dollars, and Oysters, likely dating to the Miocene or Pliocene epoch.