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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 128

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[page]127.[/page] and Dyas in Nebraska, p.20 (not Sowerby). Schizodus wheeleri, Meek, 1868. Final Rept. U.S. Geol. Survey of Nebraska, p.209. Shell attaining a length of one and one-fourth inches and a height of three-fourths to seven-eights of an inch; sub-ovate, double convex or gibbous; longer than high, higher in anterior portion than posteriorly; cross section through umbos cardiaform, umbos rounded, beaks anterior to middle. Dorsal or hinge margin convex approaching straight, bordered on each side by depressions which extend from the beaks to the posterior extremity; posterior border rather sharply rounded; basal border curving gradually until near the front when it curves abruptly into the anterior border, which curves gradually
 
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