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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 145

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[page]144.[/page] entire, often more or less modified by the habit which the animal has of attaching itsef [itself?] to crinoids or other foreign bodies. [underlined]Platystoma peoriense[/underlined], McChesney. Plate XI. figure 8. McChesney, 1860, Des. New. Paleozoic Fossils, p. 62. Strophostylus peoriensis, Keyes, 1890, American Naturalist, vol. XXIV., p.115. Shell of medium size, elongated, moderately sub-globose, two or three contiguous volutions which expand quite rapidly from first to last; the last one much inflated at the aperture; aperture longitudinally ovate; spine but slightly if at all elevated, sutures rather deep and well defined. Surface ornamented by fine striae crossing the volutions. Geol. Pos. and Loc.-- Coal Measures of Western
 
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