| La Jolla Group | |
|---|---|
| Type | (stratigraphy) |
| 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 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.
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]
The Point Loma Formation is a sedimentary geological formation in Southern California. The strata date back to the Late Cretaceous epochs of the Cretaceous period, during the Mesozoic Era.
The Jalama Formation is a sedimentary rock formation widespread in southern Santa Barbara County and northern Ventura County, southern California. Of the Late Cretaceous epoch, the unit consists predominantly of clay shale with some beds of sandstone.
The Cabrillo Formation is a Maastrichtian stage geologic formation in coastal San Diego County, southern California. It is part of the Rosario Group. The Maastrichtian stage is of the Late Cretaceous Epoch, during the Mesozoic Era.
The Hatchetigbee Bluff Formation is a geologic formation in Alabama, Georgia, Louisiana and Mississippi. The youngest unit of the Wilcox Group preserves fossils dating back to the Ypresian stage of the Eocene period, or Wasatchian in the NALMA classification. The formation is named for Hatchetigbee Bluff on the Tombigbee River, Washington County, Alabama.
The Weches Formation is a greensand, slay, and shale geologic formation in Louisiana and Eastern Texas. It preserves fossils dating back to the Paleogene period, specifically the Eocene.
The Coleraine Formation is a geologic formation in Minnesota. It preserves fossils dating back to the Cretaceous period.
The Colton Formation is a geologic formation in Utah. Its age is based on its position between the Upper Cretaceous-Paleocene North Horn Formation and overlying Green River Formation.
The Pigeon Point Formation is a geologic formation in San Mateo County, California.
The Friars Formation is a geologic formation in San Diego County, Southern California.
The Mission Valley Formation is a marine sandstone geologic formation in the Mission Valley region of southwestern San Diego County in Southern California.
The Pomerado Conglomerate Formation is a geologic formation in southwestern San Diego County, California.
The Poway Group is a geologic group in San Diego County, Southern California. It preserves fossils dating back to the Paleogene period.
The Scripps Formation is a geologic formation in coastal San Diego County, California.
The Stadium Conglomerate is a geologic formation in San Diego County, California. It is found at the northern end of Mission Valley near San Diego Stadium.
The Brawley Formation is a geologic formation in the Colorado Desert of southern California, located in northwestern Imperial County and eastern San Diego County.
The Otay Formation is a geologic formation in San Diego County, California and northern Baja California state (Mexico). It is within the Peninsular Ranges province.
The Rosario Group is a Late Cretaceous geologic group in southwestern California and northwestern Baja California (Mexico). In older literature it was named Rosario Formation.
The Blairmore Group, originally named the Blairmore Formation, is a geologic unit of Early Cretaceous age in the Western Canada Sedimentary Basin that is present in southwestern Alberta and southeastern British Columbia. It is subdivided into a series of formations, most of which contain plant fossils. In some areas it contains significant reservoirs of natural gas.
The Kootenay Group, originally called the Kootenay Formation, is a geologic unit of latest Jurassic to earliest Cretaceous age in the Western Canada Sedimentary Basin that is present in the southern and central Canadian Rockies and foothills. It includes economically important deposits of high-rank bituminous and semi-anthracite coal, as well as plant fossils and dinosaur trackways.
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