| Poway Group | |
|---|---|
| Stratigraphic range: Paleogene | |
| Type | Group |
| Sub-units | Stadium Conglomerate, Mission Valley Formation, Pomerado Conglomerate |
| Location | |
| Region | San Diego County, California |
| Country | United States |
The Poway Group is a geologic group in San Diego County, Southern California. It preserves fossils dating back to the Paleogene period. [1]
Volcanic clastic rock cobbles of rhyolite, in a sandstone matrix in this area are named Poway clasts. [2]
The ancient Ballena River brought rhyolite-gravel, or "Poway" clasts, from a region in present-day Sonora, Mexico to the Pacific Ocean. Its sediments deposited into an alluvial fan–submarine canyon–submarine fan complex extending for miles offshore. Remnants of submarine fan facies outcrops are found as far west as the northern Channel Islands. Inland Ballena River deposits outcrop discontinuously over 16 miles (26 km) in a west-southwest trend from Whale Mountain to San Vicente Reservoir; here, the river was up to 2 miles (3.2 km) in width through the Peninsular Ranges. [3]
Kennedy and Moore (1971) describe a stratigraphy of up to three geologic formations: Stadium Conglomerate, Mission Valley Formation, and the later-named Pomerado Conglomerate. The basal unit is the Stadium Conglomerate. The Stadium Conglomerate is overlain by the Mission Valley Formation. [4] The Mission Valley Formation is overlain by the Pomerado Conglomerate. [5]
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 Castle Hayne Limestone is a geologic formation in North Carolina. It consists of cobble to pebble sized clasts, usually rounded, coated with phosphate and glauconite in a limestone matrix. The Castle Hayne Limestone is known for containing fossils dating back to the Paleogene period. It preserves many of North Carolina's renowned Eocene fossils. It is named after the locality of Castle Hayne in New Hanover county, though the formation itself stretches over several counties.
The Trout Valley Formation is a geologic formation in Maine. It preserves fossils dating back to the Devonian period.
The Mulholland Formation is a Pliocene epoch geologic formation in the Berkeley Hills and San Leandro Hills of the East Bay region of the San Francisco Bay Area, California. It is found within Alameda County and Contra Costa County.
The Kern River Beds Formation is a Neogene Period geologic formation in the southeastern San Joaquin Valley, within Kern County, California.
The Friars Formation is a geologic formation in San Diego County, California.
The La Jolla Group is a group of geologic formations in coastal southwestern San Diego County, California.
The Mission Valley Formation is a marine sandstone geologic formation in the Mission Valley region of southwestern San Diego County, California.
The Pomerado Conglomerate Formation is a geologic formation in southwestern San Diego County, California.
The Scripps Formation is a geologic formation in coastal San Diego County, California. It is named for its type section north of Scripps Pier, on the north side of the Blacks Canyon mouth.
The Stadium Conglomerate is a geologic formation in San Diego County, California. It is found at the northern end of Mission Valley near Snapdragon Stadium.
The Tejon Formation is a Paleogene period geologic formation in California.
The San Francisquito Formation is a geologic formation located in northern Los Angeles County, California.
The Palm Spring Formation is a Pleistocene Epoch geologic formation in the eastern Colorado Desert of Imperial County and San Diego County County, Southern California.
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 Arroyo del Agua Formation is a geologic formation in New Mexico. It preserves fossils dating back to the early Permian period.
The Love Ranch Formation is a geologic formation in southern New Mexico. It was likely deposited during the late Paleocene and early Eocene epochs.
The Vasquez Formation (Tvz) is a geologic formation cropping out at the eponymous Vasquez Rocks in southern California. The formation dates to the Late Oligocene to Early Miocene.
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