Botanical Gazette (61)

Botanical Gazette (61)

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. 1916 edition.: ...combined. In view of the absolutely fundamental relation of coal to modern industrial development the significance of the statistical situation for the northern America continental area can scarcely be overestimated. The most important recent work on the historical aspects of coal investigation is unquestionably that of Stevenson.2 The author has had prolonged personal experience in connection with the coal deposits of the eastern United States, and has visited a number of the more interesting European formations. The summary of the literature on the subject is admirable, and enables one to realize what an enormously large amount of scientific effort has been expended on the investigation of coal during the past hundred years or more. Two main hypotheses of coal formation have held the ground during that period, namely the autocthonous or in situ hypothesis, which attributes to coal the same conditions of formation as ordinary peat; and the allocthonous or transport hypothesis, which regards coal as a sedimentary rock formed in 1 The coal resources of the world. Toronto: Morang&Co. Ltd. 1913. $25.00. 'Stevenson, J. J., Formation of coal beds. Lancaster (Penn.): New Era Printing Co. 1911-1013. $3.50. open water. The first hypothesis is almost universally accepted by geologists and has received its main support from German investigations. The transport theory of the origin of coal has always been strongly held in France. The author is clearly in favor of the peat hypothesis (in situ or autocthonous theory) and supports his views not only by a summary of the literature, commendable on account of his generous fairness, but also as a result of his own observations carried on during many years in the eastern United States. We may next consider a work on the recent formations of vegetable deposits comparable to coal at once monumental in extent and in view of the recent decease of its author actually a monument.5 Potonie divides recent...
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Product details

  • Paperback | 210 pages
  • 189 x 246 x 11mm | 386g
  • Miami Fl, United States
  • English, Welsh
  • black & white illustrations
  • 1236624254
  • 9781236624253