• Transcribe
  • Translate

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 129

More information
  • digital collection
  • archival collection guide
  • transcription tips
 
Saving...
[page]128.[/page] to the beaks. Geol. Pos.-- Missouri stage of Upper Carboniferous in Western States. [underlined]Schizodus symmetricus[/underlined], Calvin. Plate X. figure 3. Calvin, 1888, Bull. Labratories of Nat. History, S.U.I., Vol. I. Shell about one and an eighth inches long and one inch high in adult specimens; outline sub-orbicular, both valves convex, equivalve; umboses, prominent, rounded; beaks incurved, but slightly anterior to middle of dorsal margin; hinge line slightly curved; posterior margin truncated abruptly curving to basal margin, which curves gradually passing insensibly into anterior margin which curves gently around to hinge line. There
 
Scholarship at Iowa