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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 11

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10. separated from the associated limestone. These beds then, with the "Geode Bed" may be considered as merely local, and manifestly they make the capping portion of the Augusta and the lower part of the Saint Louis. Both the Keokuk and the Burlington formation furnish good building stone and very good material for the manufacturing of lime. The strata of the Kinderhook and the Augusta are conformable. But after the Augustan age there seems to have been a long period in which crustal movements occured and during which the exposed surface of the Augusta was eroded. Then the Augusta was again submerged and the Saint Louis strata were deposited uncomfortably upon its eroded
 
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