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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 141

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[page]140.[/page] Shell small depressed conical, spine but slightly elevated; volutions about five in number, last one angular at the periphery; aperture approaching rhomboidal; umbilicus closed, suture marked by an elevated nodulous band. Surface marked by fine striae parallel to lines of growth which bend abruptly backward on the periphery. Geol. Pos. and Loc.-- Coal Measures of Western States. Ref. Geol. of Missouri Vol. V., page 722. [underlined]Pleurotomaria pechumerosa[/underlined], Meek. Plate XI. figure 4. Meek, 1868, Final Rept,. U.S. Geol. Survey of Nebraska, page 232. Shell small, conical, turretted, spiral; volutions five or six increasing in size rather rapidly from apex
 
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