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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 122

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[page]121[/page] left valve marked by fine concentric striae and by lamellase markings of growth. A specimen at hand measures three and two-tenths inches high and one and eight-tenths inches long. Geol. Pos.-- Coal Measures of Western States. Ref.-- Final Rept. U. S. Geol. Survey of Nebraska. [underlined]Myalina kansasensis[/underlined], Shumard, 1858, Trans. Saint Louis Acad. Sci., Vol. I., p.213. Plate IX. figure 4. Shell attaining a length of one and one-fourth inches and a height of two and one-fourth inches; rather thick through the umbos; approximately triangular; compressed along the posterior margin; both valves convex, the left valve being slightly more convex than the other; umbos forming a vertical ridge
 
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