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 103

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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 103

[page]102.[/page]

     Dorsal valve nearly straight from beack [back?beak?] to front, but arched from side to side, beak slightly incurved ending under beak of the other valve.
     Ventral valve convex, beak prominent closely incurved, foramen oval, slightly anterior to point of beak, mesial sinus shallow, wide, extending from umbo to anterior margin. Surface marked by indistinct lines of growth and by extremely fine punctae.
     Length of shell one third to two thirds of an inch, width three sixteenths to one half inch.
Geol. Pos.-- Throughout Missouri stage.
Ref.-- Geol. of Missouri, Vol. V., page 105.

[underlined][underlined]Spiriferidae[/underlined][/underlined]

     In this family the brachia are supported by a coiled calcareous skeleton attached to the crura. The crura are direct

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[page]102.[/page] Dorsal valve nearly straight from beack [back?beak?] to front, but arched from side to side, beak slightly incurved ending under beak of the other valve. Ventral valve convex, beak prominent closely incurved, foramen oval, slightly anterior to point of beak, mesial sinus shallow, wide, extending from umbo to anterior margin. Surface marked by indistinct lines of growth and by extremely fine punctae. Length of shell one third to two thirds of an inch, width three sixteenths to one half inch. Geol. Pos.-- Throughout Missouri stage. Ref.-- Geol. of Missouri, Vol. V., page 105. [underlined][underlined]Spiriferidae[/underlined][/underlined] In this family the brachia are supported by a coiled calcareous skeleton attached to the crura. The crura are direct