DIY History | Transcribe | Scholarship at Iowa | 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 152

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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 152

[page]151.[/page]
right angles, thence they pass inward arching backward until near the suture whence they curve forward to the suture.
Geol. Pos. and Loc. Upper Coal Measurse of Western States.
Reference.-- Geol. of Illinois, Vol. V., p.605.

[underlined]Straparollus catilloides[/underlined], Conrad sp.
Plate XI. figure 14.

Irachus catilloides, Conrad, 1842, Jour. Acad. Nat. Sci. Philadelphia, Vol. VIII., p.273.
Enomphalus rugosus, Hall, 1858, Geol of Iowa.
Serpula (Spirorbis) planorbites, Geinitz, 1866, Carb. and Dyas in Nebraska, page 3. (Not Munster).
Straparollus (Enomphalus) sub-rugosus, Meek and Worthen, 1873, Geol. Sur. Illinois, Vol. V.
Straparollus catilloides, Keyes, 1891, Proc. Acad. Nat. Sci. Philadelphia., p.241.
     Shell rather small, orbicular in outline, bi-concave; volutions

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[page]151.[/page] right angles, thence they pass inward arching backward until near the suture whence they curve forward to the suture. Geol. Pos. and Loc. Upper Coal Measurse of Western States. Reference.-- Geol. of Illinois, Vol. V., p.605. [underlined]Straparollus catilloides[/underlined], Conrad sp. Plate XI. figure 14. Irachus catilloides, Conrad, 1842, Jour. Acad. Nat. Sci. Philadelphia, Vol. VIII., p.273. Enomphalus rugosus, Hall, 1858, Geol of Iowa. Serpula (Spirorbis) planorbites, Geinitz, 1866, Carb. and Dyas in Nebraska, page 3. (Not Munster). Straparollus (Enomphalus) sub-rugosus, Meek and Worthen, 1873, Geol. Sur. Illinois, Vol. V. Straparollus catilloides, Keyes, 1891, Proc. Acad. Nat. Sci. Philadelphia., p.241. Shell rather small, orbicular in outline, bi-concave; volutions