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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 146

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[page]145.[/page] States. Reference.-- Geol of Missouri, Vol. V., p.197. [underlined][underlined]Bellerophontidae[/underlined][/underlined] Shell nautiloid usually symmetrical spirally inrolled; spine concealed by succeeding volutions; aperture large; outer lip arched; sinus at middle of outer lip; sinus continued on periphery by a broad band which sometimes contains slits or perforations. [underlined]Bellerophon crassus[/underlined], Meek and Worthen. Plate XI. figure 9. M. and W., 1860, Proc. Acad. Nat. Sci. Philadelphia, p.458. Shell large, massive, sub-globose; volutions rapidly increasing in size outward; umbilicus depressed, not perforated; peripheral band narrow; raised, and bordered on each side by a rather well defined ridge. Aperture semi-
 
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