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The Franciscan Complex or Franciscan Assemblage is a geologic term for a late Mesozoic terrane of heterogeneous rocks found throughout the California Coast Ranges, and particularly on the San Francisco Peninsula.
The Matilija Sandstone (/ m ə ˈ t ɪ l ə h ə /) is a sedimentary geologic unit of Eocene epoch in the Paleogene Period, found in Santa Barbara and Ventura Counties in Southern California. It consists of thick layers of sandstone , made up of grains of feldspar and quartz from a granitic source rock, interbedded with thin layers of siltstone ...
It is a coastal transitional marine and non-marine pebble and cobble conglomerate deposit and marine sandstone rock with marine fossils, from a former bay, deposited during the Middle Pliocene to Late Pliocene ages (2–3 million years ago), of the Pliocene period during the Cenozoic Era.
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Granite's Central Group comprises six regions, representing states and specific markets outside of California: Arizona, Texas, Florida, Illinois, and Federal Division based in Colorado. Granite's Mountain Group comprises five regions, representing states and specific markets in Alaska, Washington, Oregon, Idaho, Nevada, Utah and the Water ...
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 .
The Santa Susana Formation is a Paleogene period geologic formation in the Simi Hills and western Santa Susana Mountains of southern California. [1] [2] [3] The formation consists largely of light-gray shale and some fine-grained shaly sandstone, with a lens of heavy conglomerates in the lower part. [1] [4] Small beds of limestone are also ...
Slickenlines at 500m depth in a Permian sandstone In geology , a slickenside is a smoothly polished surface caused by frictional movement between rocks along a fault . This surface is typically striated with linear features, called slickenlines , in the direction of movement.
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