Sonoma Mountains
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The Sonoma Mountains are a northwest-southeast trending formation of California Coast Ranges in Sonoma County, California, USA.[1] These mountains were formed by uplift and volcanic action about twelve million years ago in the Miocene period. The range is approximately fourteen miles (22.5 km) long and separates the Sonoma Creek watershed from the Petaluma River watershed. The highest point of this range is Sonoma Mountain, elevation 2,463 feet (751 m), which is known for the location of Jack London State Historic Park and the Fairfield Osborn Preserve. A number of threatened and endangered species are found in the Sonoma Mountains including the Fragrant Fritillary, Fritillaria liliacea.
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[edit] Hydrology
A number of creeks rise in the Sonoma Mountains. On the western slopes Copeland Creek flows through the Fairfield Osborn Preserve and discharges as the southernmost tributary of the Laguna de Santa Rosa. On the northern slopes Matanzas Creek and Spring Creek rise and are part of the Santa Rosa Creek watershed. A number of tributaries of Sonoma Creek rise on the southeastern exposures of the Sonoma Mountains including Yulupa Creek, Graham Creek and Carriger Creek.
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