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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 113

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112. the other: greatest convexity behind the middle, beak prominent, incurved upon that of other valve; foramen round placed in apex of beak. In young individuals there is no mesial sinus. But in older specimens the sinus is well defined in the front two thirds of the shell. Surface marked by lamellase lines of growth. Geol. Pos. -- Missouri stage of Coal Measures. Localities. -- La Salle, Illinois; Winterset and other points in Iowa. Reference. -- Final Rept. U.S. Geol. Survey of Nebraska, page 180.
 
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