Records of the Geological Survey of India

Records of the Geological Survey of India

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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. 1880 edition. Excerpt: ...of Baltistan and Ladak, as exemplified in theKishangauga and Dras valleys on the south side, ar.d at Shigar and Chang-Chenmo on the north. At Shigar, however, the limestones and dolomites are in much smaller proportion relatively to the other rocks than in the other localities. This persistence of mineralogical character would seem to indicate the original local union of the present triassic areas. Upper Shigar and Brdldu.--I now propose to continue our survey up the Shigar and Braldu rivers from the point where we left it at Sildi. To the north of that village the metamorphic rocks, traversed by granitic veins, are extremely variable in mineralogical composition and structure; they may consist either of light-coloured schistose gneiss, mica-schist, garnet-schist, or locally of kyaniteschist. I have already remarked on the probable relations of these rocks to the trias of Sildi. The same gneissic rocks continue through parts of Basha and Braldu as far as a little south-east of Askoli, in a kind of horse-shoe form, as will be seen from the map.1 The gneiss which ocenrs among them is very generally light-coloured, distinctly foliated, very seldom granitic, and never porphyritic. In many parts of the area in question the sequence of the rocks is not clearly exhibited, but on the upper Braldu river a very unmistakable section presents itself. In this region from a short distance to the westward of Hoto to some little distance to the eastward of Askoli, we find a regularly ascending series of these same metamorphic rocks, with a few folds, but generally having an easterly dip averaging 45. One or two thin bands of limestone occur among the schistose rocks. At Askoli the hard white and foliated gneiss is crowded with blood-red garnets, and a short...show more

Product details

  • Paperback | 312 pages
  • 189 x 246 x 17mm | 558g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236488067
  • 9781236488060