Type Geologic formation Country United States Primary Tuff, Breccia | Thickness 270 metres (890 ft) Named for Pinole | |
Underlies Orinda Formation,
Monterey Formation Group units Region Contra Costa County, California Overlies Neroly Formation, San Pablo Formation | ||
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.
It preserves fossils, including Oncorhynchus rastrosus and fragments of a proto-hipparion prehistoric horse, dating back to the Neogene period.
References
Pinole Tuff Formation Wikipedia(Text) CC BY-SA