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Coal Measures and Coal Mining in Iowa, including paleontology and a discussion on the coal formation; also the methods of mining by Russell T. Hartman, 1898

Coal Measures and Coal Mining in Iowa by Russell T. Hartman, 1898, Page 175

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[page]174.[/page] The relation of the strata of the Upper Carboniferous, especially those of the Des Moines stage, is the most complex of any in the Paleozoic group. Owing to the peculiar conditions of deposition there can be really no correlation of the different beds of this stage over any great extent of territory. At some localities there is but one seam or bed of coal. This coal sometimes upon coal measure shales At other places there are two, three, or even more seams of coal; but which of these should be correlated with the one seam of other places, if can be correlated at all, can not be determined. Then the associated beds are so inconstant that the prospector cannot tell where he is going to find coal. He only knows where it is after he has found it.
 
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