Text-Book of Geology, Vol. 2 (Classic Reprint)

Excerpt from Text-Book of Geology, Vol. 2 HE phenomena of hypogene action considered in the T foregoing pages relate almost wholly to the effects produced at the surface. It is evident, however, that these phenomena chiefly arise from movements within or beneath the earth's crust, and must be accompanied by very considerable internal changes in the rocks which form that crust. These rocks, subjected to enormous pressure, have been contorted, crumpled, and folded back upon themselves, as if thousands of feet of solid limestones, sandstones, and shales had been merely a few layers of carpet; they have been shattered and fractured; they have in some places been pushed far above their original position, in others depressed far beneath it: so great has been the compression which they have undergone that their com ponent particles have in many places been rearranged, and even crystallized. They have here and there probably been reduced to actual fusion, and have been abundantly invaded by masses of molten rock from below. In the present section, the student is asked to consider (503) 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.