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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 85

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[page]84.[/page] provided with spines which are sometimes present only in the lateral regions. Surface marked by unequal radiating costae, which are crossed by regular concentric ridges in the posterior region, giving this part of the shell a checked appearance. Geol. Pos.-- Upper Carboniferous, both stages. Localities.-- Winterset, Braddyville, etc., Iowa; Clinton, Missouri; also in Illinois, Kansas and Nebraska. Reference.-- Final Rept. U. S. Geol. Sur. Nebraska. [underlined]Productus nebrascensis[/underlined], Owen. Plate VII. figure 1. Owen, 1852, Geol. Rept., Wisconsin, Iowa and Minnesota, p. 584. Productus rogersii, Norwood and Pratten, Journal. Acad. Nat. Sci. Philad. Vol. III
 
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