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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 20

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19 Geological position, Ranging from the Keokuk limestone to the Kaskaskia limestone Iowa localities Fort Dodge, Pella, Fairfield, Mount Pleasant, and Keokuk. References. Geology of Illinois, Vol., 8. Echinodermata This subkingdom is not well represented in the Saint Louis stage and no forms will here be considered. Molluscoidea Bryozoa Gymnolaemata Cryptostomata Fenestellidae Archimedes wortheni, Hall. Fenestella (Archimedes) wortheni, Hall Proceedings of the American Association for the Advancement of Science, 1856, p. 176. Plate II
 
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