Transactions - North of England Institute of Mining and Mechanical Engineers Volume 28

Transactions - North of England Institute of Mining and Mechanical Engineers Volume 28

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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. 1879 edition. Excerpt: ...the rocks that have just been described. As shown in Plate XIX. and in Fig. 1, Plate XXI., it is unconformable to all the underlying formations. Its thickness seems to increase as the hills are approached. In Demesne Gill, on the road from Whitehaven to St. Bees, where it is overlaid by the Magnesian Limestone, it is only nine feet thick, whilst at Winder, with a denuded top, it has been proved to be 400 feet. Hematite occurs in this formation in the form of rounded and angular fragments mixed up promiscuously with the other rocks. At times these hematite fragments are very numerous, and the "Miners" then call the formation "iron gravel," or "gravel ore." It has in one or two cases actually been worked for the iron it contains. Magnesian Limestone And St. Bees Sandstone.--Neither of these formations, so far as can be seen, have any bearing on the subject, so that it will be unnecessary to say anything about them. Superficial Deposits.--The chief point of interest presented by these beds at present is that they frequently rest directly upon the deposits of hematite. They also contain a number of fragments and boulders of hematite among the numerous rocks that compose their gravels and boulder clays, some of which fragments are polished and striated. Their thickness in some places exceeds 140 feet. Before closing this introductory notice it would be profitable to glance for a few moments at some of the more salient points in the Geological history of the district. It will be seen, first of all, that, after the long period of deposition in which the vast mass of Silurians were thrown down, there succeeded a period of upheaval and severe denudation, in which those rocks were much dislocated and inclined, and more

Product details

  • Paperback | 104 pages
  • 189 x 246 x 6mm | 200g
  • United States
  • English
  • black & white illustrations
  • 1236959868
  • 9781236959867