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Geology and ground water in Napa and Sonoma Valleys, Napa and Sonoma Counties, California
Fred Kunkel, Joseph Edwin Upson
1960, Water Supply Paper 1495
Napa and Sonoma Valleys are adjacent alluvium-filled valleys about 40 miles northeast of San Francisco. They occupy alined and structurally controlled depressions in the northern Coast Ranges physiographic province and drain south into San Pablo Bay. The valleys are surrounded and underlain by unconsolidated marine and continental sediments and volcanic...