Memoirs of the Geology Survey

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Excerpt from Memoirs of the Geology Survey: England and Wales, The Geology of the Country Between Atherstone and Charnwood Forest, (Explanation of Sheet 155) The ground described in the present Memoir is contained in Sheet 155 of the New Series of the one-inch-scale map of England, and embraces the western part of Leicestershire, with adjacent portions of Warwickshire, Staffordshire, and Derbyshire. It nearly coincides with the area represented in Sheet 63 N.W. of the Old Series map of the Geological Survey, which was surveyed by Mr. H. H. Howell and Prof. E. Hull, and published in 1855. A memoir descriptive of this ground, prepared by Prof. Hull, was published in 1860 under the title of "The Geology of the Leicestershire Coal-field and of the Country around Ashby-de-la-Zouch." A small portion of the area depicted on the new map (Sheet 155) was comprised in the quarter-sheet 63 S.W. of the Old Series, and was illustrated in the Memoir on "The Geology of the Warwickshire Coal-field" by Mr. Howell, which appeared in 1859. Another smaller Memoir on "The Geology of part of Leicestershire, " by Mr. W. T. Aveline and Mr. Howell, which described the quarter-sheet No.63 S.E., was published in 1860. The whole region having to be re-examined for the mapping of the superficial deposits, which were not shown upon the old maps, advantage was taken of the opportunity to revise the survey of the underlying formations. A comparison of Sheet 155 of the New Series with the former quarter-sheets of the Old Series which it replaces, will show that considerable changes have been made in the delineation of the geology of this part of the Midlands. The employment of the Ordnance maps on the scale of six inches to a mile has made it possible to introduce more detail and to ensure greater accuracy than was attainable with the smaller scale. For the first time the ancient rocks of Charnwood Forest, so carefully studied by Prof. Bonney and the Rev. E. Hill, have been worked out in such a manner as to allow their various sub-divisions to be represented on a published map. The Cambrian rocks of Nuneaton, formerly supposed to be of Carboniferous age, but proved by Professor Lapworth to be of much older date, were revised by Mr. A. Strahan in 1886. The main sandstones in the Coal-measures near Atherstone have been mapped, while the thin-bedded character of the Keuper Sandstone is now more clearly represented. The Trias is shown to have buried the ancient peaks of Charnwood Forest much more widely than was represented on the older maps. Some doubt remains regarding the correlation of the deposits coloured on the map as Permian. 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.