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Coast Range Ophiolite : ウィキペディア英語版 | Coast Range Ophiolite
The Coast Range Ophiolite is an ophiolite of Middle to Late Jurassic age located in the California Coast Ranges. They form the basement of the extreme western margin of central and northern California. Exposures straddle the coast from Santa Barbara County up to San Francisco. The formation then trends inland up to the southern end of the Klamath Mountains.〔Bailey, et al.〕 It is arguably the most extensive ophiolite terrane in the United States, and is one of the most studied ophiolites in the North America; however, Canada has many much larger and more famous ophiolites, including the one at Gros Morne National Park. ==Description== As indicated by the name, the ophiolite is defined by the presence of ultramafic rocks in the California Coast Ranges. Pillow lavas and oceanic basalts are among the most common rocks found within the formation. There are a number of exposures that straddle the Mohorovičić discontinuity. Metamorphosed peridotite, in the form of a serpentine rock, is an indicator of the formation.〔Bailey, et al.〕
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