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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 130

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[page]129.[/page] is an obscure ridge passing from the umbo downward and backward to the posterio-ventral margin; between this ridge and the hinge line the valves are somewhat concave. Geol. Pos. Upper Coal Measures. Locality Breddyville, Iowa. [underlined][underlined]Astartidae[/underlined][/underlined] [underlined]Astartella vera[/underlined], Hall. Plate X. figure 4. Hall, 1858, Geol. of Iowa, Vol. I. part II. Shell small, longitudinally sub-ovate, convex, equivalve; beaks nearly or quite anterior, elevated, in contact with each other; hinge line straight; depressed, joining the truncated posterior margin at an angle, posterior margin passing abruptly into basal margin; ventral
 
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