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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 98

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[page]97.[/page] Reference.-- Final Rept. U. S. Geol. Sur. Nebraska, p. [?173?113?]. [underlined][?Enteletes?] hemiplicatus[/underlined], Hall. Plate VIII: figure 3. Spirifer hemiplictus, Hall, 1852, Stansbury's Expd. Gt. Salt Lake, p.409. Syntrilasma hemiplicata, Meek and Worthen, 1866, Geol. Sur. Illinois, Vol. II. Rhynchonella angulata, Geinitz, 1866, Carb. and Dyas in Nebraska, p.[?37?87?]. Referred to the genus Enteletes by Hall in 1894. Pal. New York Vol. I. Shell in younger specimens moderately convex, in adult specimens very globose, sometimes thicker than either wide or long; hinge line not more than one third of greatest breadth; breadth one half to one inch length three-eighths to seven-eighths of an inch. Dorsal valve very gibbous; beak very broad, much incurved, projecting
 
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