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The Gorda Ridge (or plural, Ridges) (centered 41° 36' N, 127° 22' W), is a tectonic spreading center, located roughly 200 kilometres (120 mi) off the northern coast of California and southern Oregon. Running northeast to southwest, the region is roughly 300 kilometres (190 mi) in length. [1]
The westerly side is a divergent boundary with the Pacific plate forming the Gorda Ridge. This ridge provides morphological evidence of differing spreading rates, with the northern portion of the ridge being narrow, and the southern portion being wide. [4] The northerly side is a transform boundary with the Juan de Fuca plate, the Blanco ...
The State Mining Bureau was renamed the Division of Mines and Geology in 1862. Its pseudonym, the California Geologic Survey, was established in January 2002. [15] In 1869, George Davidson, an assistant coast surveyor, compiled the book Pacific Coast: Coast Pilot of California, Oregon, and Washington Territory. The 262-page volume is complete ...
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 ...
The original Geological Survey of California was replaced in April 1880 by the new California State Mining Bureau. This was renamed the Division of Mines in 1927. In 1962 the division's name was expanded to be California Division of Mines and Geology , a name that lasted until August 2006, when the state legislature renamed the division the ...
The Motagua Fault, which crosses through Guatemala, is a transform boundary between the southern edge of the North American plate and the northern edge of the Caribbean plate. New Zealand's Alpine Fault is another active transform boundary. The Dead Sea Transform (DST) fault which runs through the Jordan River Valley in the Middle East.
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 boundaries of California were defined by Spanish claims of Mexico, as part of the province of Alta California. The northern boundary of Spanish claims was set at 42 degrees latitude by the Adams–Onis Treaty of 1819. [1] The states of Nevada and Utah, also originally part of Alta California, also use that line for their northern boundaries.