Cooperative Agreement Volume 15

Cooperative Agreement Volume 15

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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. 1916 edition. Excerpt: overlain by more or less arenaceous shale, but apparently never by black shale, as commonly found above coal No. 5; for this and other reasons it seems improbable that the coal lying 40 to 50 feet below coal No. 6 in the west side of the district and correlated as coal No. 5-is, rather, the thickened representative of this intermediate bed, as has been suggested This bed of coal has at present no economic value. Coiu. No. 6 ECONOMIC IMPORTANCE The entire output of coal from Franklin and Jefferson counties and nearly all that of Williamson County is obtained from coal No. 6 (Herrin or Belleville). Within the district this most important Illinois coal bed attains the remarkable thickness for Illinois coal of 13 to 14 feet. Because conditions are suitable for the recovery of the coal on a large scale, many of the largest mines of the State are located in this area. DEPTH, DISTRIBUTION, AND THICKNESS North from its line of outcrop coal No. 6 is known to lie at depths below the surface varying to a maximum of 930 feet in Jefferson County. The depth increases northward because the coal dips in that direction (see structure map, Plate V), but other variations in depth arise from surface irregularities. The altitude of the coal varies from about 500 feet above sea level to more than 350 feet below sea level. As the surface is known to reach an altitude of at least 700 feet in places, and is especially high on the west side of Franklin and Jefferson counties, the depth of the coal probably locally exceeds 1,000 feet. The deepest mine in the district, that at Mount Vernon, Jefferson County, extends 850 feet below the surface. 'Cindy, G. H., Geology of the West Frankfort quadrangle: Ill. State Geol. Survey Bull. 16, p. 262, 1910. There is...
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Product details

  • Paperback | 26 pages
  • 189 x 246 x 1mm | 68g
  • United States
  • English
  • black & white illustrations
  • 123695601X
  • 9781236956019