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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 139

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[page]138.[/page] deep; aperture large sub-circular; umbilicus closed. Surface marked by twenty or more acute well defined, revolving striae or carinae, alternating with deep, rather broad furrows, these are crossed by fine lines of growth. Geol. Pos.-- Both stages of Coal Measures. Locality.-- Kansas City, Missouri. Reference.-- Geol. of Missouri, Vol. V. part II. [underlined]Pleurotomaria tabulata[/underlined], Conrad sp. Plate XI. figure 2. Turbo tabulata, Conrad, Trans. Geol. Society of Pennsylvania, 1835, Vol. I., p. 267. P. tabulata, Conrad, 1842, Jour. Acad. Nat. Sci. Philadelphia, Vol. VIII., p.272. Shell below medium size, conical; average number of volutions about nine; volutions angular ascending rapidly, last volution large; volutions carinate around
 
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