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Proceedings of the Mineralogical and Geological Section

Proceedings of the Mineralogical and Geological Section


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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. 1879 Excerpt: ...DD., 2d Geolog. Survey of Pa., p. 76. clay and decomposed hydromica slate. A surface drift, containing iron ore, gravel, and occasional boulders, lies unconformably upon the whole formation. The section here presented was made in a shaft which the writer was allowed to have sunk within a few feet of Mr. Hitner's marble quarry, Marble Hall, Montgomery County. FEET. "Top dirt," yellow, impure. Soft white decomposed hydromica slate or im-pure "kaolin," containing occasional broken seams of sharp quartzite, but no pebbles. Coarse white sand and rounded pebbles; appar-ently a decomposed sandstone. Tough mottled red clay. Blue plastic clay. Lignite in a very tough, dark clay. Coarse yellow sand, with fragments of stony iron ore and with pebbles. The lignite bed contains occasional streaks of fine gray sand, and is underlaid by a coarser sand. So far as could be judged from the very limited exposure, it dipped south, at an angle of about 30; becoming thicker as it dipped. The lignite lies in fragments in the clay, and consists of twigs and branches of land plants, apparently all dicotyledonous. The lignite frequently shows a brilliant black lustre when transversely fractured. The small fragments are more like charcoal, and are often in the form of flattened twigs. Some of these appear to be partially rounded by attrition. No shells or marine fossils occur. Pyrite frequently encrusts the lignite or forms nodules, and when exposed to the air decomposes into ferrous sulphate. At this same locality, lignite has been taken from three other shafts in addition to the one just described. Two of these are close to the Marble Quarry, but the third is about 400 feet east of these, behind the barn of Mr. H. S. Hitner, who says that it was found many feet b...


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Product Details
  • ISBN-13: 9781130595390
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 32
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1130595390
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 77 gr


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