Reports of Explorations and Surveys to Ascertain the Most Practicable and Economical Route for a Railroad from the Mississipi River to the Pacific Ocean Volume 5

Reports of Explorations and Surveys to Ascertain the Most Practicable and Economical Route for a Railroad from the Mississipi River to the Pacific Ocean Volume 5

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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. 1856 edition. Excerpt: ... but the same series undoubtedly appears at intervals as far as the Gulf, and, probably, is extended southward along its shores. The sandy strata, which are exposed in bluffs along the Colorado, from Pilot Knob to and beyond Fort Yuma, and which also extend on the opposite shore, and along the Gila, are probably a part of the series, but have not yet been identified by fossils. They may be much more recent. These blufl's are the margins of the great desert plains, which are paved with a thick layer of pebbles--a kind of drift which has been uniformly spread out along the lower Colorado and Gila. A similar drift occurs on the tops of the mesas along Carrizo Creek. It is identified not only by a similarity in the size and general character of the pebbles, which are chiefly porphyry and black basaltic fragments, but by the presence ot quantities of silicified wood, in fragments of all sizes, from an inch in length to several feet. The largest masses of silicified wood were, however, confined to the vicinity of Carrizo Creek. The pebbles, also, along the Colorado appear to be derived from a layer of conglomerate, about five feet thick, which overlies the sandy beds; while on the other side of the Desert, at Carrizo Creek, this layer of conglomerate does not appear, or was not observed. FoJsiZs.--Fossils were obtained from one point only near the Desert and in the valley of Carrizo Creek. They form the upper stratum of one of the flat-topped hills, and great blocks, composed entirely of the shells and their fragments, have broken off by their own weight and rolled to the foot of the short slope. The stratum is several feet thick, is very hard, and is entirely composed of shells, chiefly of the genera Ostrea and Pecten, and a little clay. Mr....show more

Product details

  • Paperback | 242 pages
  • 189 x 246 x 13mm | 440g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236809068
  • 9781236809063