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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 149

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[page]148.[/page] aperture transverse, crescent-shaped; inner lip thin, outer lip thick at the sides thinner medially; sinus shallow rounded; peripheral band not well marked. Surface, except near the aperture, marked by twenty to thirty revolving costae. Lines of growth absent. Geol. Pos. and Loc.-- Coal Measures of W. States. Reference.-- Geol of Missouri, Vol. V. p. 149. [underlined]Bellerophon kansasensis[/underlined], Shumard. Plate XI figure 12. Shumard, 1858, Trans. St. Louis Acad. Science, Vol. I., p.204. Shell small, sub-globose; umbilicus nearly or quite closed; outer lip thick at sides thinner medially; inner lip well defined; aperture [remiform? uniform?]; peripheral band but slightly if at all raised. Surface marked by well defined transverse striae
 
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