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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 133

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[page]132.[/page] beaks incurved; a ridge passes dorsally from umbo parallel to hinge to posterior part of shell. Surface marked by lines of growth and by concentric undulations. Geol. Pos.-- Missouri stage, Upper Carboniferous, Western States. Ref.-- Final Rept. U.S. Geol. Survey of Nebraska, page 221. [underlined]Allorisma (Sedgwickia) granosa.[/underlined] Plate X. figure 6. Leptodomus granosus, Shumard, 1858, Trans. St. Louis Acad. Sci. Vol. I., pag. 207. Allorisma (Sedgwickia) granosa, Meek, 1868, Final Rept. U.S. Geol. Survey of Nebraska, p.220. Shell thin, irregularly oblong, length usually less than twice the height, very convex, greatest convexity at or near the middle; beaks incurved approximate, prominent, slightly
 
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