Proceedings of the Geological and Polytechnic Society of the West Riding of Yorkshire

Proceedings of the Geological and Polytechnic Society of the West Riding of Yorkshire

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. Excerpt: ... with its boulders. This clay extends from the bottoms of the valleys In the area between Wakefield and Sheffield there is very little drift, if we except a very thin surface deposit with many angular, and occasionally a few rounded, stones, which are not the mere disintegration of the rocks underneath, and which may he looked upon as the gleanings left by the great scythe of denudation to which the ground owes its present configuration. There are, however, a few patches of what is usually called drift--one near Royston, already mentioned, and not far from it a considerable expanse of extra-rounded gravel, clay with rounded pebbles near Masborough station, a block of Shapfell granite, according to Mr. Green, F.G.S., in Royston, &c. These facts prove the sojourn (f thOsea in the area under consideration, and I think that the comparative abf e of drift may be explained by supposing the area to have been a theatre of very active denudation, compared with the districts north and east, where deposition may have been in excess. y up to the highest summits of the moors. It contains very little limestone, generally speaking; and that little, from the positions in which it is found, would appear to have been floated by ice. Nine-tenths of the yellow clay formation is local, and must have been principally washed out of the hill-sides where it is found, or carried downwards, or transversely to the direction of the valleys. At the bottoms of the valleys, as at Bingley, it graduates into well rounded boulder gravel. On the summits of the table-lands, up to the height of more than 1000 feet above the sea, it is as much a boulder-drift as in the valleys--with this difference, that the matrix of the boulders and pebbles is more sandy than at the lower levels....show more

Product details

  • Paperback | 86 pages
  • 189 x 246 x 5mm | 168g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236931238
  • 9781236931238