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 143

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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 143

[page]142[/page]
outline; spine moderately elevated; number of volutions five or six, obliquely flattened above; last volution comparatively large, rapidly increasing in size; periphery biangular, both angles visible on spine; aperture sub-rhomboidal; outer margin sharp, columella extended below; umbilicus absent. Surface marked by many revolving striae, some of which are much more prominent than others these are crossed by by [?] numerous regular striae of growth giving the shell a tuberculate appearance.
Geol. Pos. and Loc.-- Lower Coal Measures of Western States.
Ref.-- Geol. of Missouri, Vol. V. Part II. p.141.

[underlined]Pleurotomaria marconiana[/underlined], Geinitz.
Plate XI. figure 6.

     Geinitz, 1866, Carb. and Dyas in Nebraska.
     Shell small, conical, volutions three

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[page]142[/page] outline; spine moderately elevated; number of volutions five or six, obliquely flattened above; last volution comparatively large, rapidly increasing in size; periphery biangular, both angles visible on spine; aperture sub-rhomboidal; outer margin sharp, columella extended below; umbilicus absent. Surface marked by many revolving striae, some of which are much more prominent than others these are crossed by by [?] numerous regular striae of growth giving the shell a tuberculate appearance. Geol. Pos. and Loc.-- Lower Coal Measures of Western States. Ref.-- Geol. of Missouri, Vol. V. Part II. p.141. [underlined]Pleurotomaria marconiana[/underlined], Geinitz. Plate XI. figure 6. Geinitz, 1866, Carb. and Dyas in Nebraska. Shell small, conical, volutions three