Tulare Formation

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Tulare Formation
Stratigraphic range: Neogene & Quaternary
Underlies(is topmost formation)
OverliesSan Joaquin Formation
Thicknessup to 4,000 feet (1,200 m)
RegionSan Joaquin Valley, California
CountryUnited States

The Tulare Formation is a Pliocene to Holocene epoch geologic formation in the central and southern San Joaquin Valley of central California.[1][2]


It overlies the San Joaquin Formation, and can be up to 4,000 feet (1,200 m) thick.[1][2]

Its sediments consist mainly of unconsolidated deposits of clay, silt, sand, and gravel.[1]


Many freshwater fossils are preserved in the formation, dating back to the Neogene and Quaternary Periods of the Cenozoic Era.[3] They include the largest fossil assemblage of clams and snails known on the Pacific Coast.[1]

See also[edit]


  1. ^ a b c d USGS.gov: "Geology of the Tulare Formation and other continental deposits, Kettleman City area, San Joaquin Valley, California, with a section on ground-water management considerations and use of texture maps"; Water-Resources Investigations Report 83-4000; by R.W. Page; 1983.
  2. ^ a b USGS.gov: "Neogene Gas Total Petroleum System—Neogene Nonassociated Gas Assessment Unit of the San Joaquin Basin Province"; Chapter 22 of the Petroleum Systems and Geologic Assessment of Oil and Gas in the San Joaquin Basin Province, California; by Allegra Hosford Scheirer and Leslie B. Magoon.
  3. ^ Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 8 July 2014.