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The oldest rocks in California date back 1.8 billion years to the Proterozoic and are found in the San Gabriel Mountains, San Bernardino Mountains, and Mojave Desert.The rocks of eastern California formed a shallow continental shelf, with massive deposition of limestone during the Paleozoic, and sediments from this time are common in the Sierra Nevada, Klamath Mountains and eastern Transverse ...
Vasquez Rocks Natural Area Park is a 932-acre (377-hectare) park located in the Sierra Pelona in northern Los Angeles County, California. It is known for its rock formations, the result of sedimentary layering and later seismic uplift. It is located near the town of Agua Dulce, between the cities of Santa Clarita and Palmdale.
Franciscan rocks are thought to have formed prior to the creation of the San Andreas Fault when an ancient deep-sea trench existed along the California continental margin. This trench, the remnants of which are still active in the Cascadia and Cocos subduction zone, resulted from subduction of oceanic crust of the Farallon tectonic plate ...
Rocks in the ranges are dominated by Mesozoic granitic rocks, derived from the same massive batholith which forms the core of the Sierra Nevada Mountains in California. They are part of a geologic province known as the Salinian Block which broke off the North American Plate as the San Andreas Fault and Gulf of California came into being.
The resultant molten rock rose through the Earth's crust over the span of 100 Ma, forming several plutons, or a chain of volcanoes if the magma reached the surface. Most of the granitic rocks formed between 105 and 85 Ma, during the Cretaceous, with pluton formation ending around about 70 Ma.
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Castle Crags is a dramatic and well-known rock formation in Northern California.Elevations range from 2,000 feet (610 m) along the Sacramento River near the base of the crags, to over 6,500 feet (2,000 m) at the summit of the tallest crag.
San Mateo Rocks visible in top left of this map of the western part of San Diego County, California (United States Geological Survey, 1919)San Mateo Rocks are uninhabited islands that lie approximately 0.5 mi (0.80 km) off the coast of California, [1] to the south of San Clemente, and just north of San Mateo Point, a minor headland that marks the border between Orange County and San Diego ...