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Geological Formations

Anderson Valley

Erosional and Karst Formations

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Anderson Valley is a sparsely populated region in western Mendocino County in Northern California, about 100 miles north of San Francisco. The name covers rural, unincorporated communities strung along Anderson Creek and its tributaries feeding the Navarro River, stretching from Boonville through Philo to Navarro. Elevation ranges from sea level to 2,500 feet, and the terrain is steep hills and mountains surrounding rolling to nearly level alluvial terraces covered in mixed forests of coast redwood, oak, and Douglas fir. The valley is part of the roughly 315 square mile Navarro River watershed, the largest coastal drainage basin in Mendocino County, and takes its name from William Anderson, an early European settler.

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