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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 156

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[page]155[/page] Shell large, thin, approaching ovoid; spine acute, last volution greatly expanded having a height equal to or greater than the height of spine above. Volutions seven or eight in number; suture plain well marked but only slightly impressed. Umbilicus closed by columella; aperture ear shaped. Surface marked only by striae of growth. Geol. Pos. and Loc. Coal Measures of Des Moines Valley. Reference.-- Hall's Geol. of Iowa, Vol. I., pt. II., p. 719. [underlined]Sphaerodoma ponderosa[/underlined], Swallow, sp. Plate XI. figure 17. Macrocheilus ponderosum, Swallow, 1858, Trans. St. Louis Acad. Science, Vol. II., p.202. M. texanum, Shumard, 1858, Trans. St. Louis Acad. Science, Vol. I., p. 204. Soleniscus (?) ponderosus, White, 1884, Geol.
 
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