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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 163

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[page]162[/page] septa slightly concave; siphuncle nearly central. Geol. Pos. and Loc. : Coal Measures of Western States. Reference.-- Geol. and Nat. History of Indiana, 1883, page 164. [underlined]Orthoceras cribrosum[/underlined], Geinitz. Plate XII. figure 2. Geinitz, 1866, Carb. and Dyas in Nebraska, page 4. Resembles Orthoceras rushensis, but has siphuncle eccentric and cross section elliptical. Geol. Pos. and Localities,-- Coal Measures of Illinois, Iowa, Nebraska, West Virginia, etc. Reference,-- Final Rept. U.S. Geol. Survey of Nebraska, p.234. [underlined][underlined]Nautilidae[/underlined][/underlined] In this family the shell is spirally coiled
 
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