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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 95

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[page]94.[/page] rapidly to posterior lateral borders, mesial sinus wide, moderately deep extending from near beak to front margin. Surface marked by concentric ridges which become larger toward the anterior margin, small [oppressed?] spines near front of ventral valve. Geol. Pos. Coal Measures. Ref.-- Final Rept. U. S. Geol. Sur. of Nebraska, p. 169. [underlined]Productus muricatus[/underlined] Norwood and Pratten, 1854, Jour. Acad. Nat. Sci. Philad. Vol. III. Plate VII. figure 3. Shell small, very thin, sub-elliptical in outline, wider than long, width to length about as three to two, greatest width about five-eighths of an inch, hinge line equal in length to greatest width; cardinal angles compressed.
 
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