Wilson Grove, California

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Wilson Grove is located in Sonoma County, California, United States. [1] It contains rock formations and a grove of redwood trees. [2] [3] Wilson Grove is located near California's Russian River, west of Windsor, California; since the 1920s, Wilson Grove (named after Walter Wilson) has been used for camps and outings. [3] [4]

By 1922, mollusc fossils had been discovered and analyzed in Wilson Grove, which up to the 1970s was considered as part of the Merced Formation. [5] [6] [7] Scientific studies of the rock formations at Wilson Grove began by 1952, and eventually by 1988 provided evidence that around 4 million years ago, there was a shallow sea covering Sonoma County, which was named as the Wilson Grove Sea, distinct from the Merced Sea covering San Francisco during that time. [8] [9] In 1983, the rock formations at Wilson Grove were named as the Wilson Grove Formations, which extends to the wider Sonoma County and enters a part of Marin County, California. [7]

References

  1. ↑ U.S. Geological Survey Geographic Names Information System: Wilson Grove, California
  2. ↑ LeBaron, Gaye (May 22, 1988). "First the river, then the mountains, then the people". The Press Democrat. Retrieved July 13, 2025.
  3. 1 2 Dugan, Barry (May 23, 2002). "River gravel pits purchased for parks". Sonoma West Times and News. Retrieved July 13, 2025.
  4. ↑ "Items from Forestville". Sonoma West Times and News. August 1, 1924. Retrieved July 13, 2025.
  5. ↑ Roth, Barry; Guruswami-Naidu, Raj (1974). "A new species of fossil Nuttallia (Mollusca: Bivalvia) from the Pliocene of Sonoma County". Bulletin of the Southern California Academy of Sciences. 73 (3): 140–146. Retrieved July 13, 2025.
  6. ↑ Cardwell, G.T. (1958). Geology and Ground Water in the Santa Rosa and Petaluma Valley Areas Sonoma County California (PDF). U.S. Government Printing Office. Retrieved July 13, 2025.
  7. 1 2 Powell, Charles; Allen, James; Holland, Peter (2004). Invertebrate Paleontology of the Wilson Grove Formation (Late Miocene to Late Pliocene), Sonoma and Marin Counties, California, With Some Observations on Its Stratigraphy, Thickness, and Structure (Report). U.S. Department of the Interior and U.S. Geological Survey. Retrieved July 13, 2025.
  8. ↑ LeBaron, Gaye (May 22, 1988). "First the river, then the mountains, then the people". The Press Democrat. Retrieved July 13, 2025.
  9. ↑ Tectonic Setting of Late Miocene, Pliocene, and Pleistocene Rocks in Part of the Coast Ranges North of San Francisco, California. U.S. Government Printing Office. 1983. Retrieved July 13, 2025.

38°31′00″N122°51′17″W / 38.51667°N 122.85472°W / 38.51667; -122.85472

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