Excerpt from The Physical Geography, Geology, Mineralogy and Paleontology of Essex Couty, Massachusetts Twelve years ago, at the request of the Trustees of the Peabody Acad emy of Science, I began work upon a preliminary map of the bed - rock of Essex County, which was published in 1894 in the Bulletin of the Essex Institute. In the meantime I prepared a number of short papers which were also published in the Bulletin, under the general title of Geological and Mineralogical Notes. Since 1894, the work Of mapping the out ...
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Excerpt from The Physical Geography, Geology, Mineralogy and Paleontology of Essex Couty, Massachusetts Twelve years ago, at the request of the Trustees of the Peabody Acad emy of Science, I began work upon a preliminary map of the bed - rock of Essex County, which was published in 1894 in the Bulletin of the Essex Institute. In the meantime I prepared a number of short papers which were also published in the Bulletin, under the general title of Geological and Mineralogical Notes. Since 1894, the work Of mapping the out crops Of bed-rock in the County has been continued and the superficial deposits of sand, gravel, till, clay-beds, peat - deposits and silts have been plotted with the greatest possible accuracy. With the exception of such areas as are under water, every Sixth of a mile in the entire County has been examined several times by ranges running from east to west and also from north to south. In the determination of the rocks, over eight hun dred thin sections have been prepared, the larger portion of which are preserved, together with the rock specimens, in the cabinets of the Peabody Museum. The results of this close examination of the surface are presented in the following pages. The physical geography Of the County is described and much space has been devoted to the surface features. The outcrops of bed-rock are superficially described in the text, and at the end of the volume a map will be found on which the de posits Of boulder-till, gravel-terraces, sand-plains and other features are represented together with all outcrops of bed-rock. The points Of the compass indicated are according to the magnetic compass, its variation from the true north in this region in 1898 being 12??? 7' west. To Dr. Henry S. Washington, of Locust, New Jersey, I am indebted for chemical analyses of many of the rocks, especially those in the syenite group. I also would acknowledge my obligations to Dr. William H. Dall. 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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