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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 142

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[page]141.[/page] to base, convex, angular, shouldered, a revolving depression on the periphery just below the shoulder; upper side of volutions flattened, sloping toward the shoulder from the suture; suture well defined but only slightly channelled; aperture comparatively large, oval, narrowly rounded below, somewhat angular at termination of shoulder. Surface marked by very fine lines of growth and by coarser revolving lines or ridges. Geol. Pos. and Loc.-- Upper Coal Measures of Western States. [underlined]Pleurotomaria grayvillensis[/underlined], N. and P. Plate XI. figure 5 Norwood and Pratten, 1855, Jour. Acad. Nat. Science of Philadelphia, Vol. III., page 75. Shell small, conical above sub-globose below; ovate in transverse
 
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