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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 12

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11. surface. [underlined] THE SAINT LOUIS [/underlined] The Saint Louis formation extends several hundred miles north of any known exposure of the Augusta It is the most widely distributed of all of the Lower Carboniferous formations in Iowa. The greatest thickness in Iowa does not exceed ninety feet, while the average thickness in this state is much less. In fact the Saint Louis is thin until the mouth of the Missouri river is reached. From there southward it thickens so rapidly that it exceeds three hundred feet in thickness at Saint Louis; and in Sainte Genevieve county in Missouri it is more than six hundred feet in thickness In Iowa this formation consists of sandy clayey and calcareous depos-
 
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