Bulletin Volume 6-74

Bulletin Volume 6-74

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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. 1914 edition. Excerpt: ...surface permitted strong ocean currents to invade the swamps and cover the beds of vegetation with fine sediment. As the centuries rolled on this layer of sediment became thicker and thicker. A slackening in the rate of sinking of the land may have permitted a second swamp with its tangled vegetation to form on the grave of the first. In time this second swamp also was sunk beneath the water and buried in the silt and sediment of the sea. These various movements of the earth's surface with the resultant growth and burial of great masses of vegetable matter occurred no less than six times over that portion of Iowa indicated in figure 1. As time rolled on, great pressure came upon these buried masses of vegetation from the increasing deposits of sediment over them. It is also probable that as they became more deeply buried they were subjected to increasing temperature. Thus all the conditions necessary for the changing of the vegetation into coal were present and the rich fuel supplies we are now enjoying, were formed. This change of vegetation and peat into coal is called bituminization. In the process of bituminization, thru the loss of water and other changes the bulk of the vegetable mass is greatly reduced. The amount of this reduction varies considerably, depending upon the nature of the original swamp materials and the amount of transformation which takes place. It has been estimated that it would take nearly 2,000 acres of forest to produce one acre of coal three feet in thickness. In the case of the average Iowa coal bed it has probably taken no less than thirty feet of closely compacted material to produce a seam of coal four and one-half feet thick. Ordinary anthracite probably shrinks to less than one-tenth of its original bulk in the...show more

Product details

  • Paperback | 176 pages
  • 189 x 246 x 10mm | 327g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236496507
  • 9781236496508