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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 126

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[page]125.[/page] de Verneuil). Nuculana bellistriata, Meek, 1868, Final Report, U. S. Geol. Survey of Nebraska, p. 206. Shell small, may attain a length of one inch and a height of one-half inch; sub-ovate, not so convex as nucula ventricosa; hinge margin nearly or quite straight proceeding backward to pointed posterior extremity; basal margin a long regular curve, curving more rapidly at anterior end into anterior margin which curves around to hinge margin. Between the hinge line adn the umbonal ridges are depressions extending from the beaks to the posterior extremity. Beaks prominent, projecting above the hinge, situated about one-third of the length of the shell behind the anterior end. Surface marked by
 
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