Report Upon United States Geographical Surveys West of the One Hundredth Meridian Volume 3, No. 1

Report Upon United States Geographical Surveys West of the One Hundredth Meridian Volume 3, No. 1

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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. 1875 edition. Excerpt: ...6 inches or more in length, but along the plane of deposition it splits like straightgrained wood. Indeed, so regular is this splitting, that large fragments are not unlike silicified wood. Occasionally it shows small flexures, as if from lateral compression, and at some exposures it contains thin seams of quartz, or of quartz and feldspar, occupying the cleavage planes. At the junction of Taylor and East Rivers, this rock is seen in the cafion almost black and somewhat contorted. Followed up East River, it becomes lighter in color, more micaceous, and the wrinkling of the laminae disappears. About a mile above the junction it contains a good deal of segregated granite, by which, apparently, it is eventually displaced. In the cafion of Taylor River it continues for two or three miles above the junction and then disappears, the walls of the gorge thenceforward consisting of coarse granite. At the head of this canon the stratified rocks are again seen, and under them appears this gneiss, showing the same characters as before. In Beattie Park, about. a mile south from the cafion, it is somewhat talcose, and portions of it bear much resemblance to serpentine. In the long cafion of the Arkansas, just below the junction with the South Arkansas, it is quite variable in its character, sometimes resembling a red micaceous sandstone, and at others so much like a diorite in physical character as to be somewhat perplexing. This rock is of extensive distribution west of the Arkansas, but was not seen in or east from South Park. It always occurs directly under the sedimentary rocks, and no similar formation occurs lower down. It is clearly unconformable to the great mass of the schist and gneiss, though precisely like them in its changes. In...
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Product details

  • Paperback | 230 pages
  • 189 x 246 x 12mm | 417g
  • United States
  • English
  • black & white illustrations
  • 1236750187
  • 9781236750181