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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.
While the unit is 1,200 meters (3,900 feet) thick at the type locality, it is much thicker elsewhere; along the southern slope of the San Rafael Mountains it is exposed from its base to its top, where it is probably in conformable contact with the Jalama Formation, and the total thickness is around 5,300 meters (17,400 feet) – 5 kilometers ...
According to the US Energy Information Administration (EIA) in 2011, the 1,750-square-mile (4,500 km 2) Monterey Shale Formation contained more than half of the United States's total estimated technically recoverable shale oil (tight oil contained in shale, as distinct from oil shale) resource, about 15.4 billion barrels (2.45 × 10 ^ 9 m 3). [11]
Locally, Modelo Formation consists of interbedded diatomaceous shale, claystone, mudstone, and siltstone with minor sandstone, limestone, chert, and tuff beds. The most widely exposed rock units in the area are the Plio-Pleistocene marine and non-marine Pico and Saugus Formations that crop out on the southern flank of South Mountain-Oak Ridge.
The Rincon Formation (or Rincon Shale) is a sedimentary geologic unit of Lower Miocene age, abundant in the coastal portions of southern Santa Barbara County, California eastward into Ventura County. Consisting of massive to poorly bedded shale , mudstone , and siltstone , it weathers readily to a rounded hilly topography with clayey, loamy ...
Deeper sediments metamorphized into quartzite and form a thin layer ~10 ft (3.0 m) thick between the shale and basement granite. [ 2 ] [ 3 ] The Marble Mountains Fossil Beds are the site of 550-million-year-old fossils of trilobites , which were among the first animals on earth with eyes and skeletons.
Turbidites in the Venado Sandstone (Great Valley Sequence) at Lake Berryessa, California.. The Great Valley Sequence of California is a 40,000-foot (12 km)-thick group of related geologic formations that are Late Jurassic through Cretaceous in age (150–65 Ma) on the geologic time scale.
Except where underlain by the Sixtymile Formation, the Tapeats Sandstone is the Cambrian geologic formation that is the basal geologic unit of the Tonto Group.Typically, it is also the basal geologic formation of the Phanerozoic strata exposed in the Grand Canyon, Arizona, and parts of northern Arizona, central Arizona, southeast California, southern Nevada, and southeast Utah.
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