Author: United States Geological Survey

Publisher: Forgotten Books

Published: 2017-11-19

Total Pages: 546

ISBN-13: 9780331450354

Excerpt from Bulletins of the United States Geological Survey, 1883-1884: No. 1 to 5 The material from which it has been prepared was Obtained during the geological study of the Leadville region, and would naturally have been included in the monograph on that district but for the following reason: The andesites from Buffalo Peaks, which, 'at first glance, ap posred to be most characteristic augite-andesites, were found by Mr. Cross on careful examination to did'or essentially from the normal order as commonly described. In tracing out the relations Of these rocks to the closely-allied so-called augite-andesites, Mr. Cross has Obtained re sults which, if substantiated, give to these investigations a much more general than local character, and make them of value to lithologists in general; so that it seems desirable that they Should be published by themselves in the form of a Special paper. Very respectfully, your obedient servant, S. F. Emmons, Geologist in Charge. 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.