• 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 92

More information
  • digital collection
  • archival collection guide
  • transcription tips
 
Saving...
[page]91[/page] Ventral valve very gibbous with greatest convexity back of the middle; beak incurved; valve marked by radiating costae and, marginally by lamellase folds of growth, spine bases few not prominent. The posterior half of both valves is beautifully reticulated. Geol. Pos.-- Coal Measures of Iowa, Illinois, Missouri, Kansas, and Nebraska. Reference.-- Final Rept. U.S. Geol. Sur. Nebraska, p.160. [underlined]Productus symmetricus[/underlined]. Plate VII. figure 5. McChesney, 1860, Desc. New Paleozoic Fossils p.35, 1866, Trans. Chicago Acad. Science, Vol. I., p. 25. Shell medium in size, sub-elliptical in outline, somewhat wider than long, greatest width anterior to middle, lateral and anterior
 
Scholarship at Iowa