![]() ![]() Most were deposited on the sea bottom as sediments, but in many places also had cracks, crevices and other gaps infused with molten lava or other masses of igneous rock, which were forced in molten condition into the sedimentary rocks. Most of the rocks were formed during the Tertiary, Cretaceous and Jurassic periods. The rocks themselves that comprise the mountains are of a great variety and widely varying geologic ages. Here the southern end meets the Los Angeles Transverse Ranges, or Sierras de los Angeles. ![]() They extend southward for more than 60 miles (97 km) to where the coastline turns eastward along the Santa Barbara Channel, around the area of Point Conception. ![]() The northern end of the California Coast Ranges overlap the southern end of the Klamath Mountains for approximately 80 miles (130 km) on the west. Physiography Northern and Southern Coast Ranges and other major mountain ranges of California UNESCO has included the " California Coast Ranges Biosphere Reserve" in its Man and the Biosphere Programme of World Network of Biosphere Reserves since 1983. Physiographically, they are a section of the larger Pacific Border province, which in turn is part of the larger Pacific Mountain System physiographic division. The other three coastal California mountain ranges are the Transverse Ranges, Peninsular Ranges and the Klamath Mountains. The Coast Ranges of California span 400 miles (644 km) from Del Norte or Humboldt County, California, south to Santa Barbara County. ![]()
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