Pinole Tuff Formation
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UnderliesOrinda Formation,
Monterey Formation Group units
Monterey Formation Group units
Thickness270 metres (890 ft)
| Pinole Tuff Formation | |
|---|---|
| Stratigraphic range: Neogene | |
| Type | Geologic formation |
| Underlies | Orinda Formation, Monterey Formation Group units |
| Overlies | Neroly Formation San Pablo Formation |
| Thickness | 270 metres (890 ft) |
| Lithology | |
| Primary | Tuff, breccia |
| Location | |
| Region | Contra Costa County California |
| Country | United States |
| Type section | |
| Named for | Pinole, California |
The Pinole Tuff Formation is a geologic formation of the East Bay region of the San Francisco Bay Area in California.
It is found near Pinole and Rodeo area at San Pablo Bay and the Briones Hills of western Contra Costa County.
- Fossils
It preserves fossils, including Oncorhynchus rastrosus[1] and fragments of a proto-hipparion prehistoric horse, dating back to the Neogene period.
