 | | Journal (issue) | | Articles History and minerals of The Geysers, Sonoma County, California .....................................1852 to the 1920’s, is located in northern Sonoma County about 145 km north of San Fran cisco, California...(1970). The Mayacmas Mountains of northern Sonoma County are underlain by rocks of the Jurassic-Cretaceous...The interiors of these crusts are crys talline. Silicate Minerals Silicates are rather limited in occurrence...deposits of the western Mayacmas district, Sonoma County, California. California Journal o f Mines and Geology |  | | Book | | species are reported by 1-2 shows the county boundaries and county names. When possible, locations of mines...within a township is illustrated by Figure 1-1. county of occurrence. Map *M. Fleischer’s 1980 Glossary...Map 1-2. Outline map of California showing county boundaries. 4 MINERALS OF CALIFORNIA R5W i...first District of Imperial Yuma, Diego County, County, near the Colorado River about 10 miles north...San Ysidro, San Arizona. 1828; from Los Angeles County, San Francisquito Canyon, in in Then in on the | | | Book | | are reported by county of occurrence. Map 1-2 shows the county boundaries and county names. When possible...,o Map 1-2. Outline map of California showing county boundaries. __ _) 4 MINERALS OF CALIFORNIA...in placers of the Potholes District of Imperial County, near the Colorado River about 10 miles north of...reported from San Ysidro, San Diego County, in 1828 ; from Los Angeles County, San Francisquito Canyon, in 183...183 5; and in the Piru District, Ventura County, in the early 1840s. Then in 1848 the discovery of gold |
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