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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 72

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[page]71[/page] longer than broad about as fine to three, beak raised, sharp, but not projecting beyond the posterior border. Shell flattened along the midline. Surface bright marked by beautiful concentric striae, between coarses lines of growth. Length about three eighths of an inch. Geol. Pos.-- Coal Measures. Localities.-- Des Moines, Iowa; Springfield, Illinois. [underlined][underlined][underlined]NEOTREMATA.[/underlined][/underlined][/underlined] The Brachiopods of the order are circular, or nearly so, in outlines, and have the pedicle opening confined to the ventral valve. Inarticulate. [underlined][underlined]Discinidae[/underlined][/underlined] [underlined]Orbiculoidea nitida[/underlined], Plate V. Phillips, 1836: Geology of Yorkshire, Vol. II, p. 221.
 
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