Excerpt from Some Mining Districts in Northeastern California and Northwestern Nevada The map Of Nevada north of latitude 39 as prepared by the Fortieth Parallel Survey, affords the best geologic data obtainable on the camps visited. This map shows the geology of the Peavine and Cottonwood districts in Washoe County and of the Battle Moun tain, Skookum, and Reese River districts in Lander County. The so-called Archean rocks shown on this map at Peavine Mountain, north of Reno, are now known to be granites that are intrusive into pre-tertiary schists. Battle Mountain consists in part of sediments Older than the Weber quartzite, though it includes also the rocks of which it is shown to consist on Map V of the Fortieth Parallel Atlas. The determinations of many of the flow rocks given by Zirkel have been changed, largely owing to the development of the science of petrography. The writer wishes to express his indebtedness to the mining men Of the camps visited for numerous courtesies, especially to Mr. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.