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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 99

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[page]98[/page] slightly above beak of other valve hinge area narrow. Ventral valve not quite so convex as other valve; beak obtuse broad slightly incurved; hinge area small, delthyrium triangular about as wide as high. Surface marked by fine radiating striae and by marginal lines of growth also anterior to [?umbos?], by large radiating plications; the largest plication forming the mesial fold of the dorsal valve, a deep furrow-forming the mesial sinus of ventral valve. Geol. Pos. Missouri stage, Coal Measures. Localities -- Montgomery County, Iowa; also in Nebraska. Reference. -- Geol. of Missouri, Vol. V., Part II., page 76.
 
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