This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1868 Excerpt: ...ten inches thick is found one mile from the Hutchinson gold mine of the new Placer, but neither its size nor its position entitle it to attention. Carboniferous limestone appeared on the surface near the Hutchinson mine, and can probably be traced around the entire groups of mountains known as the old and new Placers, ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1868 Excerpt: ...ten inches thick is found one mile from the Hutchinson gold mine of the new Placer, but neither its size nor its position entitle it to attention. Carboniferous limestone appeared on the surface near the Hutchinson mine, and can probably be traced around the entire groups of mountains known as the old and new Placers, which are connected together, so as to form a broad mountain chain. They consist chiefly of porphyritic and sienitic hills, and where traces of stratification remain, the planes are highly inclined. At the northern part of Monte Largo, a group, in part at least, of the same nature as the Placers, and continuing the same I must again remind the reader that the terms upper, middle, and lower cretaceous are used in a local sense; all the strata contain fossils similar to those of the European newer cretaceous. t Newberry, in Ives' Beport, Geology, p. 84, et seq. % Oonf. U. S. and Mexican Boundary Survey, vol. i, Geology, p. 35, on the cretaceous age of the lignites of the lower Rio Grande. broad mountain chain, I observed two mountains apparently capped with carboniferous limestone, and the superjacent brown sandstone. On the more eastern of these two mountains the strata dip to the eaft, on the other they lie nearly horizontally, with an abrupt twist, visible on the southern side, thus: The superficial gold deposits of the Placer mountains are very extensive, and moderately rich; but there is not enough water to work them with advantage, except during the rainy season. On the mountain slopes in the deeper ravines springs are not unfrequent, and I think that by judicious boring water might be obtained in greater quantities. Below the Ortiz mine there are several fine springs, and I see no reason why, with proper exploration, other equally favorab...
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Add this copy of Notes on the Geology of the Survey for the Extension of to cart. $34.96, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2018 by Palala Press.
