| San Pablo Formation | |
| Type: | Geologic formation |
| Age: | Miocene |
| Period: | Miocene |
| Region: | Contra Costa County, California |
| Country: | United States |
| Subunits: | Briones Sandstone, Cierbo Sandstone, Neroly Sandstone |
| Underlies: | Pinole Tuff Formation |
| Thickness: | 1500feet |
The San Pablo Formation is a Late/Upper Miocene epoch geologic formation of the East Bay region in the San Francisco Bay Area, California.[1]
It is found on the south shore of San Pablo Bay, in western Contra Costa County.[1]
It is series of marine sandstones with tuffs and ashes. Its subunits, listed alphabetically, are Briones Sandstone, Cierbo Sandstone, Neroly Sandstone,[2] and underlies the Pinole Tuff Formation.[1]
It preserves fossils dating back to the Neogene period.[3]