Report Upon the Colorado Riwer ODF the West

Report Upon the Colorado Riwer ODF the West

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1861 edition. Excerpt: ...massive beds of limestones heretofore considered, as I think erroneously, the equivalents of the Lower Carboniferous or Mountain limestone. The strata composing the plateau bordering the Great and Little Colorados by their dip form an elongated basin, of which the greatest diameter extends from tho Mogollon mountains northwesterly into Utah. The Great Colorado crosses that line nearly at right angles; the course of the Little Colorado being parallel to and locally coincident with it. Near the western margin of the basin some of the older sedimentary strata are seen dipping eastward, resting on the flanks of the mountain chains which I have described as bounding the plateau in that direction. They here present bold escarpments towards the west, oftener the result of erosicn than fracture. They have evidently been elevated by the upheaval of the plutonie rocks upon which they rest, but as they are usually quite unchanged, the igneous rocks could not then have been in a state of fusion, but were themselves the products of anterior eruptions. The oldest Palaaozoic rocks are nowhere, on our route, included in the elevated cscarpments to which I have referred; and in the Great Canon the lower members of the series are seen deposited around, and abutting against, pinnacles and ridges of granite, which seem to be spurs from the Cerbat or Aztec mountains. Hence it appears that the mountain chains which bound the plateau on the west existed, at least in embryo, before the dawn of the Palaaozoic period, and formed a barrier which, to a great degree, limited the deposition of the Silurian and Devonian strata to the basin-like area lying east of them. The same phenomena recur on the other side of the plateau, near the Rio Grands, where the...show more

Product details

  • Paperback | 176 pages
  • 189 x 246 x 10mm | 327g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236627709
  • 9781236627704