An isocarb map of a part of the Arkansas-Oklahoma coal field and the data on which it is based are given. The variations in fixed-carbon content in the coal from bed to bed and from place to place are pointed out and discussed. The writer concludes that: (1) differences in original composition have had little effect on the fixed-carbon content of these coals; (2) differences in amount of overburden have produced no increase in carbonization from a younger to an older coal bed in this area; and (3) the major variations in fixed-carbon content of the coals of this area are directly related to structural deformation by pressure from the south.

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