| Orinda Formation | |
|---|---|
| Stratigraphic range: Miocene | |
| Type | Geologic formation |
| Underlies | Moraga Formation |
| Overlies | Tice Shale, of Monterey Formation Group |
| Lithology | |
| Primary | coarse conglomerates |
| Location | |
| Region | Alameda County and Contra Costa County, California |
| Country | United States |
| Type section | |
| Named for | Orinda, California |
The Orinda Formation is a Miocene epoch geologic formation in the Berkeley Hills of the East Bay region of the San Francisco Bay Area, California.[1]
It is found within Alameda County and Contra Costa County.[1][2]