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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 140

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[page]139.[/page] the periphery, carina nodulose; above and below teh carina the volutions are usualy slightly concave. Suture well defined; aperture transverse, ovate; umbilicus closed. Surface marked by revolving striae which are cancellated by striae parallel to lines of growth. These cancellations often cause a nodulose appearance near the suture. Geol. Pos., Coal Measures of Pennsylvania, Indiana, Illinois, Iowa, etc. Reference.-- Hall's Geology of Iowa, Vol. I part II, p.721. [underlined]Pleurotomaria sphaerulata[/underlined], [Comad?]. Plate XI. figure. 3. [Comad?], Jour. Acad. Nat. Sci. Philadelphia, Vol. VIII. p. 272. P. coronula, Hall, 1852, Stansbury's Exped. Gt. Salt Lake, page 413.
 
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