Excerpt from Geology of the Disseminated Lead Deposits of St. Francois and Washington Counties In taking up the study of the ore deposits of the district, I had in mind three problems, to the solution of which all my efforts have been directed These problems are, (1) The original source of the lead; (2) The reason for the location of the ore bodies; and (3) The reason for the local richness of certain portions of the ore bodies. The contents of the report are therefore so ar ranged as to best present such explanations. ...
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Excerpt from Geology of the Disseminated Lead Deposits of St. Francois and Washington Counties In taking up the study of the ore deposits of the district, I had in mind three problems, to the solution of which all my efforts have been directed These problems are, (1) The original source of the lead; (2) The reason for the location of the ore bodies; and (3) The reason for the local richness of certain portions of the ore bodies. The contents of the report are therefore so ar ranged as to best present such explanations. The formations belong chiefly to the Cambrian and pre-cam brian, the latter of which offers an excellent field for petrologic studies, to which no attention is given in this report. The Cam brian, the latter of which offers an excellent field for petrographic mainly of brachiopods, trilobites and crinoids. To these very little attention has been directed, only a very fragmentary collection having been made. The physiography and sedimentation of the district, which are equally as interesting subjects, have been given very little attention. This report, on the whole, is a study of the ore deposits, and more especially of the so-called disseminated lead ore. An attempt has been made to illustrate the manner of occurrence of the galena through drawings made underground of actual ore faces. The various structures have been noted and the relation of these to the ore has been faithfully represented in the many draw ings inserted herein. The facts from which our conclusions are drawn are well illustrated in this report, but it is impossible to express the effect which repeated observations of these facts has had upon these conclusions. The three important factors involved in the introduction and precipitation of the lead are unquestion ably the ground-water, the jointing and faulting, and the composi tion of the sediments. To these frequent reference is made in the report. In the descriptions of the mines there is probably consider able seemingly unnecessary repetition. However, to the author, it has been the repeated observation of such facts that has led to the conclusions contained herein. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... 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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