Petrography of the Newark Igneous Rocks of New Jersey (Classic Reprint)

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Excerpt from Petrography of the Newark Igneous Rocks of New JerseySmall inclusions are found in the base of First Mountain, and probably also in the others, consisting of sandstone or shale frag ments up to 2 or 3 inches in diameter, which are baked into a hard jaspery condition. An oval sandstone mass, 2 by 4, feet, appar ently unaltered, was found in the Third Mountain sheet at Pomp ton. The only microscopic changes noticeable in the smaller inclu sions are a darkening of the red color and the development of crystalline calcite, both chie¿y within 2 or 3 millimeters of the contact. Contact effects on the underlying strata are of a similar character where found at all. Often no change whatever is ap parent.The shale 1 to feet beneath the First Mountain basalt, around the curved southwestern portion, is mottled by partial bleaching and rendered porous by the removal of small calcite crystals which this rock usually contains. In the spaces native copper and chalcocite have been deposited. Nothing comparable to this is found under the. Other sheets, nor under other portions of this one. The effects are attributed to ore-bearing solutions, proba bly magmatic waters, that brought up the copper from the intrusive sheet of Palisade diabase below.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.