Kód: 15542854
Excerpt from Transactions of the Geological Society of Pennsylvania, 1835, Vol. 1 The oldest or lowest members of the red sand stone group, consisting of various coloured shales, pass insen sibly into the upper dark shales and ... celý popis
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Excerpt from Transactions of the Geological Society of Pennsylvania, 1835, Vol. 1 The oldest or lowest members of the red sand stone group, consisting of various coloured shales, pass insen sibly into the upper dark shales and limestone shales of the grauwacke group below, whose beds are so much tilted as often to be perpendicular. To the first lime stone parallel succeeds a vast series of highly inclined undulating and contorted strata including granular and crystalline quartzose rocks, calcareous, siliceous, and schistose conglomerates, limestones and marbles, slates and shales; comprehending within them numerous beds of glance coal, bituminous anthracite, graphitic anthra cite, radiated and conchoidal anthracite, and several varieties of iron ore. There are also distinctive chao racters about most of these rocks, familiar to those who have studied them, independent of their order of posi tion, by which they may be recognized. Their organic remains are peculiar and useful guides. 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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