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Excerpt from House Documents, Vol. 58 of 112: 59th Congress, 2d Session, December 3, 1906-March 4, 1907 The field work on which this bulletin is based covered a period lasting from June to December, inclusive, 1905. The geologic work was under the general supervision of Mr. F. L. Ransome, and was carried on simultaneously, with the mapping of the topographic base by Messrs. R. H. Chapman and B. D. Stewart. The writer is fully conscious of the many inaccuracies of the geologic map herewith presented, but trusts that it may prove not only an aid to the prospector and miner, but a contribution to the geology of an intensely interesting region. Each day approximately 45 square miles was mapped in an area of by no means simple geol ogy, and in many localities the geologic mapping of necessity pre ceded the topographic. No other region in the United States is so favorable to rapid mapping, since the exposures are unexcelled and the scant vegetation masks scarcely a geologic detail. The geology of the Paleozoic rocks is, however, difficult, partly on account of the lithologic similarity of many of the formations, but largely because these older rocks are in part hidden by mantles of Tertiary lavas and Recent gravels. In the text it has been the endeavor to distinguish clearly between observations made at close range and inferences drawn with the aid of the field glass. The mapping of the outer Goldfield hills and of the Pabate Mesa are particularly unsatisfactory. 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.

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