The Geognosy of the Appalachians and the Origin of Crystalline Rocks: Address to the American Association for the Advancement of Science, on Retiring from the Office of President of the Association, Indianapolis, August 16, 1871 (Classic Reprint)
The Geognosy of the Appalachians and the Origin of Crystalline Rocks: Address to the American Association for the Advancement of Science, on Retiring from the Office of President of the Association, Indianapolis, August 16, 1871 (Classic Reprint)
Excerpt from The Geognosy of the Appalachians and the Origin of Crystalline Rocks: Address to the American Association for the Advancement of Science, on Retiring From the Office of President of the Association, Indianapolis, August 16, 1871 Laurentian gneiss. The coarse-grained, porphyritic, reddish vari eties common to the latter are wanting in the Green Mountains, where the gneiss is generally of pale greenish and grayish hues. Massive stratified diorites, and epidotic and chloritic rocks, often more or less schistose, ...
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Excerpt from The Geognosy of the Appalachians and the Origin of Crystalline Rocks: Address to the American Association for the Advancement of Science, on Retiring From the Office of President of the Association, Indianapolis, August 16, 1871 Laurentian gneiss. The coarse-grained, porphyritic, reddish vari eties common to the latter are wanting in the Green Mountains, where the gneiss is generally of pale greenish and grayish hues. Massive stratified diorites, and epidotic and chloritic rocks, often more or less schistose, with steatite, dark colored serpentines and ferriferous dolomites and magnesites also characterize this gneissic series, and are intimately associated with beds of iron ore, generally a Slaty hematite, but occasionally magnetite. Chrome, titanium, nickel, copper, antimony and gold are frequently met with in this se ries. The gneisses often pass into schistose micaceous quartzites, and the argillites, which abound, frequently assume a soft, unctuous character, which has acquired for them the name of talcose or na creous slates, though analysis shows them not to be magnesian, but to consist essentially of a hydrous micaceous mineral. They are sometimes black and graphitic. 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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