La Jolla Group
The La Jolla Group is a group of geologic formations in coastal southwestern San Diego County, Southern California. Its locations include the coastal La Jolla San Diego region.
| La Jolla Group | |
|---|---|
| Sub-units | Mount Soledad Formation, Ardath Shale, Scripps Sandstone, Friars Formation, Delmar Formation, Torrey Sandstone |
| Underlies | Poway Group |
| Location | |
| Region | San Diego County, California |
| Country | United States |
The group preserves fossils dating back to the Cretaceous period.[1]
Most of the La Jolla Group stratigraphy was deposited during the Eocene when sea level was higher than its present-day elevation. Eocene aged formations of the La Jolla Group include the Ardath Shale, Delmar Formation or Delmar Sand, Friars Formation, Mount Soledad Formation, Scripps Formation, and Torrey Sandstone (alphabetical order).[2] There are only abundant fossils found in some sections of the Del Mar Formation, mostly bivalve shells.
The La Jolla underlies the Stadium Conglomerate of the Poway Group.[3]
See also
- Paleogene Period in California
- List of fossiliferous stratigraphic units in California
- Paleontology in California
References
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
- "Geolex — Unit Summary, La Jolla". National Geologic Map Database. United States Geological Survey. n.d. Retrieved 26 September 2021.
- Michael P. Kennedy; George W. Moore (1971). "Stratigraphic Relations of Upper Cretaceous and Eocene Formations, San Diego Coastal Area, California". AAPG Bulletin. 55 (5): 709–722, 709–722. doi:10.1306/819A3C5A-16C5-11D7-8645000102C1865D. ISSN 0149-1423. Wikidata Q108701240.
Further reading
- Weber, F. Harold (1963). Geology and mineral resources of San Diego County, California. California Division of Mines and Geology. p. 32.
- Kennedy, Michael P. (1975). Geology of the San Diego metropolitan area, California. California Division of Mines and Geology.