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Excerpt from Valleys: And Their Relation to Fissures, Fractures, and Faults Physical geologists are at variance as to the forces which have formed the present features of the earth's surface. It seems to have been formerly a very general belief that the Shapes of the ground are more Or less due to movements in the crust of the earth which have Opened cracks and fissures, elevating some portions and depressing others, and that to these movements, combined with marine denudation, the features of the surface of the earth are due. Hutton seems to have been the first to broach the theory that the surface has been principally sculptured by meteoric abrasion; and now most of the working geologists in Great Britain seem inclined to dis regard unduly every other kind of action. During many years of geological research, we have noted certain relations between the different kinds of Shrinkage fissures, breaks, lake-basins, valleys, and other features of the earth; and although formerly we accepted in a great measure the theories of the subaerialists, we are now led to believe that the different denudants must act in combination - each separately being incapable of doing much work. 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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