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Excerpt from The Petrography and Genesis of the Sediments of the Upper Cretaceous of Maryland: A Dissertation to the Board of University Studies of the Johns Hopkins University in Conformity With the Requirements for the Degree of Degree of Doctor of Philosophy With the light portion there is separated an abundance of grains of a translucent to opaque, humus-brown substance full of small dark granules. The substance is isotropic, index of refraction 155-156. It crushes plastically under the knife. Probably it is a combination of organic and inorganic colloidal matter, with inclusions of granules that may be both mineral and carbonaceous but are not fresh mineral grains. 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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