The Geology Of The Neighbourhoods Of Flint Mold And Ruthin

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Excerpt from The Geology of the Neighbourhoods of Flint, Mold, and Ruthin: Explanation of Quarter-Sheet 79 The first edition of the Quarter-sheet of the Maps of the Geological Survey (79 S.E.) described in the present Memoir was published in 1850, and was revised up to 1855. The western portion was principally mapped by Mr. W. T. Aveline, the Coal-Measures by Mr. D. H. Williams, and the New Red Sandstone by Professor E. Hull, while the lodes were inserted by Sir W. W. Smyth. The materials for the present Memoir were collected during a re-survey by Messrs. C. E. De Ranee and A. Strahan, made on the six-inch scale, when the boundaries of the Glacial and other superficial deposits were traced for the first time. The eastern part of the Quarter-sheet, comprising the New Red Sandstone and the Flintshire Coal-field (exclusive of the Leeswood district), was re-surveyed by Mr. De Ranee, the remainder of the map by Mr. Strahan. Quarter-sheet 79 S.E. (Old Series) covers nearly the same area as Sheet 108 (New Series). The limits of the latter lie about half-a-mile further south and further west than those of the earlier map. The area represented includes portions of the Vale of Clwyd, the Estuary of the Dee, and the intervening high ground composed of Silurian and Lower Carboniferous Rocks. Considerable changes have been made in the mapping of the Vale of Clwyd. The Trias, formerly believed to overlap the Carboniferous rocks, and to pass on to the Wenlock Shale, is now shown to be affected by a great fault, which throws down both Carboniferous and Triassic strata along the western flanks of the Silurian range. 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.