Lower Silurian System of Eastern Montgomery County, New York Volume 34

Lower Silurian System of Eastern Montgomery County, New York Volume 34

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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. 1900 edition. Excerpt: ...hill. Northward it gives ofi' several branch faults and has been traced by the early geologists of the New York survery and more recently by Mr Darton and-Prof. Prosser to the Archaean mass northwest of Saratoga. The 'most interesting part however both from the standpoint of geology _.and of topography is at the deep glen north of Hoffman ferry, known as /Volf's hollow, where there is an escarpment on the western side of the glen forming a mural cliff of over 100 feet in places almost perpendicular. The glen has been cut presumably by the creek which may now be seen as a diminutive stream flowing by the roadside through the glen, where the soft shales of the Utica(?) and Hudson river formations lie inclined at a high angle against the hard resisting wall of Calciferous sandrock. One: may see therefore on the one hand a wall of massive calcareous sandstone rising in beetling cliffs, or more or less hidden by its own talus from which spring forest trees and a remarkable variety bf ferns, and on the other hand a slope composed of black friable shales, with an occasional seam of smooth jointed sandstone, inclined at a sharp angle away from the precipitous clif f across the way. Lying almost perpendicularly against the foot of the limestone cliff are layers of very black, slaty shale undoubtedly belonging to the Utica though the shales seen in the slope across the highway are from the presence of layers of sandstone and their general lithologic characters, Hudson river. If the approximate base of the Hudson river is near the foot of the escarpment then taking the thickness of the Utica stage as 1200 feet there is a displacement here of over 1300 feet. N orthward from the " hollow " the escarpment becomes less pronounced...show more

Product details

  • Paperback | 26 pages
  • 189 x 246 x 1mm | 68g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236775015
  • 9781236775016