Carnegie Institution of Washington Publication Volume 54

Carnegie Institution of Washington Publication Volume 54

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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. 1907 edition. Excerpt: ...synclines. Although we were not able to make a detailed examination of the beds at K'ui-chou on the Yang-tzi, the succession there seemed to be similar in the large to that just described, with the exception that Pumpelly reports, in place of the basal red shale, a fine-grained micaceous sandstone grading upward into calcareous sandstone. The gray limestone there is slightly thicker. Nearly 5 miles, 8 kilometers, below Pa-tung-hien it contains a workable coal-seam near its base, and 2 miles, 3 kilometers, above K'ui-chou six thin seams of coal in the same limestone are being mined for the manufacture of briquets. East of the mountains of Carboniferous limestone at I-chang, there is apparently a recurrence of the K'ui-chou formation. As the massive Wu-shan limestone declines beneath the river at a gentle angle, it is followed by coarse conglomerates, sandstone, and sandy shale, which are locally reddish. We had no opportunity of examining the rocks, but the description of them given by Pumpelly is here quoted as significant: Near the city of I-ehang, at the eastern mouth of the gorge, the limestone strata, trending here N. E., and dipping about 8 to the S-E-, are covered by apparently conformable beds of fine-grained, gray sandstone, which, toward the top, soon merges into a coarse conglomerate. The change is very marked, the upper portion of the sandstone containing rounded fragments of chert near the contact, and the lower part of the conglomerate having lenticular deposits of sandstone. This transition appears to mark some important change that took place during the formation of these deposits, and the fact that, in transverse section, they border the river for 12 miles and have a great thickness, would seem to indicate that this more

Product details

  • Paperback | 248 pages
  • 189 x 246 x 13mm | 449g
  • United States
  • English
  • black & white illustrations
  • 1236851382
  • 9781236851383