Orinda Formation
| Orinda Formation Stratigraphic range: Pliocene | |
|---|---|
| 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 Pliocene 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]
Geology
The Orinda Formation is a coarse marine conglomerates sedimentary formation. It underlies the volcanic Moraga Formation. [3]
It preserves fossils dating back to the Pliocene epoch of the Neogene period. [4]
See also
- Pliocene California geology
- List of fossiliferous stratigraphic units in California
- Paleontology in California
References
- 1 2 USGS.gov: "Upper Cretaceous and Lower Tertiary Rocks Berkeley and San Leandro Hills, California", by J. E. Case, GEOLOGICAL SURVEY BULLETIN 1251-J, 1968.
- ↑ Geology Blog: "Grizzly Peak and Moraga basalt"
- ↑ Lawrence Berkeley Lab.gov: "Berkeley Lab Geologist Studies the Ground Beneath His Feet"
- ↑ Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 8 July 2014.
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