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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 164

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[page]163.[/page] in one plane. [underlined]Nautilus occidentalis[/underlined], Swallow. Plate XII. figure 3. Swallow, 1858, Trans. St. Louis Acad. Sci., Vol. I. page 175. Nautilus quadrangulania, McChesney, 1860, Des. New Paleozoic Fossils, page 65. Nautilus biserialis, Hall, 1860, Supp. to Vol. I., part II., Geology of Iowa, page 2. Shell discoid, containing a rather wide shallow umbilicus, showing most of each inner volutions. A section of the volutions shows them to be nearly qudrangular the sides and dorsum being flattened. The angles of the volutions are nodular. The septa are moderately closely arranged and have a backward curve on the sides and periphery. The siphunale is near the center. Geol. Pos. and Loc.-- Missouri Stage, Western States
 
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