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 alluvial 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

References

  1. 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.
  2. ↑ Geology Blog: "Grizzly Peak and Moraga basalt"
  3. ↑ Lawrence Berkeley Lab.gov: "Berkeley Lab Geologist Studies the Ground Beneath His Feet"
  4. ↑ Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 8 July 2014.
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