Memoirs of the Geological Survey

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Excerpt from Memoirs of the Geological Survey: England and Wales, The Geology of the Country North-East of York and South of Malton, (Explanation of Quarter-Sheet 93 N. E.), (New Series, Sheet 63, ) The sheet of the Geological Survey Map, of which the following pages contain a description, embraces a large part of the Vale of York, with a portion of the Jurassic and Cretaceous uplands to the east and north-east. One of the most interesting geological features which it illustrates is the remarkable overlap of the Chalk, which to the north may be observed lying on the Kimeridge Clay, whence it steals across the underlying formations until, in the south, it rests on the Lower Lias. Although there is an actual southward thinning of the Lower Oolites and Upper and Middle Lias, this structure is mainly the result of denudation, the Jurassic rocks having been greatly disturbed, faulted and denuded, before the Chalk was laid down upon them. The edition of the Map on which the superficial deposits are coloured, shows well at a glance the characteristic features of the ground and the relative prominence of the different formations. The various alluvial accumulations cover wide spaces of the lower grounds, out of which rise ridges of glacial clays, sands, and gravels, while the slopes of the escarpments and the higher ground above them are entirely bare. As the area here described forms only a part of an extensive and important geological region, the present Memoir deals chiefly with local phenomena. The general structure and history of the whole region will be discussed in the Memoir on the Jurassic Rooks of Yorkshire, now in preparation by Mr. Fox-Strangways, where also full reference to the geological literature of the area will be given. 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.