Excerpt from Report on the Geology of the Coast Mountains: And Part of the Sierra Nevada, Embracing Their Industrial Resources in Agriculture and Mining
The examinations authorized were entered upon soon after the passage of the resolution, and continued until the 28th of November, comprising a period in the field of about six months. The first five weeks were occupied in examinations of the more elevated and western portions of the Counties of Butte, Sierra, Yuba, Nevada and Placer, in determining, as far as possible, the position of an ancient water course in this section of the State, and its peculiarities - the description of which will be found in the body of this report.
On the 23d June, the southern portion of the tour was commenced, and carried on almost uninterruptedly for four months. The route south was carried through the Counties of San Francisco, Santa Clara, Santa Cruz, Monterey, and the north part of Luis Obispo; on the west, and returning on the east, (or through that range denominated the Monte Diablo Eange) by the west part of Tulare County, Mariposa, Tuolumne, Alameda, Contra Costa and San Joaquin.
The range of country bounded on the north by the Straits Carquinez, and south by the Nacismiento, was divided into four sections, formed by lines running nearly east and west from the great valley to the coast. On the first of October, the country north of the Straits Carquinez was entered, and preliminary examinations only were made in the counties of Solano, Napa and Sonoma, From the County of Napa a section was carried across the basin of the Sacramento, and connected with, examinations made two years previous on its eastern edge. A similar section was also made, passing eighteen miles south of Monte Diablo and continued across the San Joaquin.
The remainder of the months of October and November was employ ed in investigations of the middle mining sections of the County of Nevada and those intermediate between the former and the middle and western parts of Calaveras county. This range leads through that section in which the principal gold mines of the middle portions of the State are located, and was selected, with the view of conducting those examinations which will be found in the appendix of this report, under the head of Quartz Mining.
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