| Purisima Formation | |
|---|---|
| Stratigraphic range: Late Miocene-Early Pleistocene ~ | |
 Outcrop of Purisima Formation sandstone at San Gregorio State Beach | |
| Type | Formation |
| Lithology | |
| Primary | Sandstone, siltstone |
| Other | Conglomerate, phosphorite |
| Location | |
| Region | California |
| Country | United States |
The Purisima Formation is a geologic formation in California that preserves fossils dating from the Late Miocene to Late Pliocene. [1] It stretches from Point Reyes to the Santa Cruz Mountains. [2]
Valenictus is an extinct genus of Odobenidae from the Pliocene of California.
Liptornis is a genus of fossil birds of uncertain affinities. The type species is L. hesternus. It was described by Argentine palaeontologist Florentino Ameghino in 1894 from a large cervical vertebra from the Middle Miocene Santa Cruz Formation of Patagonia. At the time, it was referred to the Pelecanidae, though this is questionable. In his 1933 palaeornithological review, Lambrecht referred it only to the superfamily Sulides without placing it in a family. A later study has suggested family Anhingidae.
The Chatsworth Formation is a Cretaceous period sandstone geologic formation in the Simi Hills and western Santa Susana Mountains of southern California.
The Chanac Formation is a Cenozoic Era sandstone geologic formation in the southeastern San Joaquin Valley, within Kern County, California.
The Modelo Formation is a Miocene geologic formation in the Simi Hills and western Santa Susana Mountains of southern California, including under parts of Los Angeles.
The Towsley Formation is a geologic formation in the Santa Susana Mountains, in Los Angeles County, California.
The Topanga Canyon Formation is a Miocene epoch geologic formation in the Santa Monica Mountains, Simi Hills, Santa Ana Mountains and San Joaquin Hills, in Los Angeles County, Ventura County, and Orange County, southern California. It is primarily composed of hard sandstone with some inter-bedded siltstone.
The Santa Margarita Formation is a Neogene Period geologic formation in the San Joaquin Valley of central California.
The Santa Cruz Mudstone is a geologic formation in California. The siliceous organic mudstones of the formation were deposited in deep water and fluvial environments. The formation overlies the Santa Margarita Sandstone and is overlain by the Purisima Formation. The Santa Cruz Mudstone was formerly considered part of the Monterey Formation. The formation preserves bivalve and echinoid fossils as well as vertebrates of Parabalaenoptera baulinensis and Otodus megalodon. The formation dates back to the Late Miocene period.
The Santa Clara Formation is a geologic formation in the southeastern Santa Cruz Mountains, in Santa Clara County, California.
The Martinez Formation is an Eocene Epoch geologic formation in California.
The Santa Susana Formation is a Paleogene period geologic formation in the Simi Hills and western Santa Susana Mountains of southern California.
The Silverado Formation is a geologic formation in Orange County, California. It preserves fossils dating back to the Paleogene period. It is located in the northwestern Santa Ana Mountains and is named after Silverado Canyon, and consists of sandstone, clay, and conglomerate.
The Sweetwater Formation is a geologic formation in California. It preserves fossils from the Late Eocene period. It underlies the Otay Formation, which reserves fossils of the Oligocene to Miocene periods of the Cenozoic Era.
The Tejon Formation is a Paleogene period geologic formation in California.
The Santa Rosa Flat Formation is a geologic formation in California. It preserves fossils dating back to the Permian period.
The Manix Formation is a geologic formation in California. This formation dates to the Pleistocene Epoch and is known to preserve fossils. Specimens of the extinct camelid, Camelops have been uncovered from the Rancholabrean units of this formation of both the species C. hesternus and C. minidokae.
The San Benito Gravels is a Quaternary Epoch geologic formation in California.
The Santa Rosa Island Formation is a geologic formation in California. It preserves fossils.
The Santa Cruz Formation is a geological formation in the Magallanes/Austral Basin in southern Patagonia in Argentina and adjacent areas of Chile. It dates to the late Early Miocene epoch, and is contemporaneous with the eponymous Santacrucian age of the SALMA timescale. The Santa Cruz Formation is known for its abundance of vertebrate fossils, including South American native ungulates, as well as rodents, xenarthrans, and metatherians.
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