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The Oxnard Plain is a large alluvial coastal plain in southwest Ventura County, California, United States that that covers over and is bounded by the Santa Monica Mountains, the Santa Susana Mountains, and Oak Ridge (beyond which lies the Conejo Valley) to the east, the Topatopa Mountains to the north, the Santa Clara River Valley to the northeast and the Pacific Ocean to the south and west.〔Thomas, H. E., and Others (1962) ("Effects of Drought Along Pacific Coast in California: 1942-56" ) ''Geological Survey Professional Paper'', Volume 372-G. United States Department of the Interior〕 The Oxnard Plain is home to the cities of Oxnard, Camarillo, Port Hueneme and much of Ventura as well as the unincorporated communities of Channel Islands, El Rio, Saticoy and Somis which comprise a majority of the western half of the Oxnard-Thousand Oaks-Ventura Metro Area. This alluvial plain has been formed chiefly by the deposition of sediments from Calleguas Creek and Santa Clara River before they flow into the Pacific Ocean.〔 The Santa Clara River is one of the largest river systems along the coast of Southern California and only one of two remaining river systems in the region that remain in their natural states and not channelized by concrete. The alluvial deposits from these rivers are generally a few hundred feet () thick and lie over Pleistocene and Pliocene sedimentary rocks. The is among the longest stretches of continuous, linear beaches in the state. The Oxnard Plain section of the Southern California Bight extends from the abrupt transition of the steep rocky shore along the Santa Monica Mountains on the south to the Ventura River on the north.〔("SUBSEQUENT ENVIRONMENTAL IMPACT REPORT FOR FOCUSED GENERAL PLAN UPDATE and Related Amendments to the Non-Coastal Zoning Ordinance and Zone Change ZN05-0008" ) ''County of Ventura'' (June 22, 2005)〕 This coastal area contained a series of marshes, salt flats, sloughs, and lagoons prior to the expansion of agricultural.〔 The coastal geography of the beaches and sand dunes has been impacted as the area became the most engineered coastline in the state with three harbors and various rock structures.〔 Ventura County is one of the principal agricultural counties in the state and it is a significant component of the economy with a total annual crop value in the county of over $1.8 billion in 2014. The high quality soils, adequate water supply, favorable climate, long growing season, and level topography are characteristic of the Oxnard Plain where the top cash crops are strawberries, raspberries, nursery stock, celery, tomatoes, lima beans, peppers, and cut flowers. There is strong public sentiment for retaining agricultural production, as reflected in the SOAR (Save Open Space and Agricultural Resources) initiatives that have been approved by voters.〔("Crop Report 2012" ) ''Ventura County Agricultural Commissioner''〕 The Oxnard Plain contains a considerable petroleum reserve with several active oil fields – the Oxnard Oil Field, east of Oxnard, the West Montalvo Oil Field, along the coast south of the outlet of the Santa Clara River, and the Santa Clara Avenue Oil Field north of U.S. Highway 101 near El Rio. There are also several smaller abandoned oil fields. Oil facilities are interspersed with agricultural land uses both east and west of Oxnard. ==History== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Oxnard Plain」の詳細全文を読む スポンサード リンク
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