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Excerpt from Geology of the Marysville Mining District, Montana: A Study of Igneous Intrusion and Contact Metamorphism Chapter II. Detailed description and relations OR the rock forma'i'ions - Continued. Igneous rocks and their structural relations - Continued. Gabbro intrusions - Continued. Petrography Normal form. Contact form Associated pegmatites. Feldspar-porphyry dikes General character Belmont porphyry dik Description Geologic relations. Microscopic petrog'raphy Contact relations Degree and kinds of alteration Age relations. 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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