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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 125

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[page]124[/page] margin slightly convex, sloping gradually to posterior margin which curves rapidly into the basal margin which in turn curves gently around to anterior margin which is also regularly curved. The beaks are rather prominent and near the most anterior projection of the shell. Surface marked by fine regular striae and by lines of growth. Length of shell about one-half inch; height about three-eights inch. Geol. Pos.-- Coal Measures of Western States. * [underlined]Nuculana bellistriata[/underlined], Stevens, sp. Leda bellistriata, Stevens, 1858, American Journal Science and Arts, Vol. XXV., p.261; and Hall, 1858, Geol. of Ia. Vol. I., Part II., page 717. Nucula kansasensis, Geinitz, 1866, Carb. and Dyas in Nebraska, page 206, (not * See Plate 10. figure 1.
 
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