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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 10

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tributed over the east side of the Mississippi river; being widely distributed over Illinois, Indiana, Kentucky, and Tennessee. West of the river the chief exposures are in southeastern Iowa and northeastern Missouri. The lower portion of the Keokuk is a heavily bedded bluish limestone. The upper part is largely made up of shale containing scarce of calcareous material. The whole is intermingled with cherty bands. The Warsaw beds, at Warsaw Illinois, as defined by Hall, are composed of (1) ten feet of closely bedded buff limestone, (2) Thirty feet of blue calcareous shale with thin limestone bands, (3) Eight feet of yellow sandy shale. At Keokuk these beds are considerably thinner, while southward they lose their clayey nature and do not appear to be
 
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