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Sonoma Coast State Park
Sonoma Coast State Park is a State of California property in Sonoma County consisting of public access use on lands adjoining the Pacific Ocean. This extent of beach runs from a coastal point about north of Jenner and continues for approximately to the south to terminate at Bodega Head. The property lies along State Route 1 and consists of a number of named beaches including Arched Rock Beach, Gleason Beach and Goat Rock Beach. The ecosystem consists of alternating sandy beaches and rocky shoreline, with a marine terrace extending above the entire extent with an upland California coastal prairie habitat.
==Geology==
This strip of coastal property is subject to continuing marine erosion as well as windborne erosion, thus creating a situation where an average of one to three feet (30 to 90 cm) per year of land mass is lost. Obviously in years of heavy storms this value can be higher, whereas, in a less stormy year the land erosion can be lower. Over the last geologic epoch the land has been subject to uplift, a process which has created a marine terrace of the entire extent of the property. This marine terrace is elevated approximately 50 to 100 feet (15 to 30 meters) above mean sea level, which results in a steep bluff directly above the littoral zone.
Vertical rock formations are a geological hallmark of this site, and have weathered far less than the bulk of the soils. These features are known as sea stacks, and they appear standing out of the water or on the beach as though as sculptures placed decoratively along the shoreline. Occasionally these stacks appear as adornments on the marine terrace, indicating their ancient origin on the sea floor prior to uplift. These rock formations are composed of sandstone with layers of quartz.
The active San Andreas Fault runs roughly parallel and near to the coastline of Sonoma Coast State Park. Soils within the site are classified as coastal beach sands (where rocky shoreline is not evident) and marine escarpment group soils on the marine terrace; typically soils above the marine terrace are in the Rohnerville loam group.〔''Soil Survey, Sonoma County, California'', U.S. Department of Agriculture, Soil Conservation Service, Government Printing Office, Washington DC, May 1972〕 Most of the beach sands consist of a medium coarse brown to gray sandy materials, reflecting the high rate of erosion of escarpment soils into the ocean; however, there are patches of smooth pebble beach such as the approximately one hundred meter stretch lying immediately north of Goat Rock.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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