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Home > Biographies & Memoire > Biography and non-fiction prose > Anthologies: general > The Clays and Shales of Virginia West of the Blue Ridge
The Clays and Shales of Virginia West of the Blue Ridge

The Clays and Shales of Virginia West of the Blue Ridge


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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. 1920 Excerpt: ...fusibility. Northeast of Webster there is not a little shale exposed along the road, but it is mostly hard or gritty, although in places it was seen to be overlain by shallow deposits of residual clay. On the southeast side of the valley along the base of Porters Mountain the rock is mostly limestone with some residual clay overlying it. ROANOKE COUNTY. Bonsack.--A tongue of the Cambro-Ordovician formations extends northeastward from Roanoke up the valley of Glade Creek. The exposed rocks are chiefly shales and shaly limestones, lying mostly on the northwest side of the Norfolk and Western Railway. Around Bonsack in particular there are exposures of residual clay derived from shales, but none of the sections is very deep, and time was not available to make borings. However, small samples were carefully taken at several different points, and they may be regarded as representing the fully weathered shale. One of these was a fourth of a mile west of Bonsack (Field No. 57), and north of the road leading from Bonsack to Cloverdale. It is a yellow and red, smooth, plastic clay. No prediction can be made regarding the quantity of it. The material (Lab. No. 2229) works up with 40 per cent of water, and had an air shrinkage of 9.1 per cent. This is probably high, and it could be molded with less water, which would reduce the air shrinkage. At Cone 010 the fire shrinkage was zero, and the absorption 28.1 per cent, while at Cone 05 the fire shrinkage and absorption were 4.4 and 19.6 per cent, respectively. The clay burns red and is steel hard at Cone 05. Its absorption is a little high, but the material could be used for common brick. Following up the Cloverdale road, the shales outcrop to the southeast of the Cambrian rocks, but are not promising. If we cross the Cam...


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Product Details
  • ISBN-13: 9781130020908
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 38
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1130020908
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 86 gr


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