The Geology of the Country Around Northallerton and Thirsk (Classic Reprint)

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Excerpt from The Geology of the Country Around Northallerton and ThirskThe present Memoir is a further contribution to the detailed description of the Jurassic region of Yorkshire. The maps described in it (Quarter-Sheets 96 N. W. and S. W.) embrace a large part of the Yale of York, and a portion of the low watershed between the basin of the Humber and that of the Tees. The western half of both maps is mainly covered by Permian and Triassic rocks, hut on the east side the Jurassic series is admirably displayed, rising steeply into the long escarpments of the Cleveland and Hambleton Hills, and reaching a height of more than 1, 400 feet above the sea. This picturesque range of uplands has been deeply trenched by denudation, some portions of them being separated as outliers in front of the main mass, as is well seen along the northern edge of the escarpment at Whorlton, and further east. Many sections are thus laid bare, and nearly the whole Jurassic series can be well studied in this region, from the top of the Rhætic Beds up to the Kimeridge Clay.A comparison of the two editions of the maps (with and without Drift) will show to what a great extent the lower grounds are covered with superficial formations, while the Jurassic tableland is free from such deposits. The glacial accumulations reach a higher level (600 feet) in the northern than in the southern part of the district (400 to 500 feet), and, as already remarked in the Memoir on the Geology of Eskdale, &c., (Quarter- Sheet 96 N.E.), these Yorkshire high grounds appear to have lain above the limits here reached by the northern ice-sheet. In the Glacial sands and gravels banked up against the escarpment marine shells occur.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.