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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 80

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[page]79.[/page] lines of growth. Geol. Pos.-- Missouri stage of Coal Measures. Localities,-- Winterset and other points in south western Iowa. Reference, Final Rept. U. S. Geol. Sur. Nebraska. [underlined][underlined]Productidae.[/underlined][/underlined] The members of this family have tubular anchoring spines. [underlined]Chonetes granulifera[/underlined]. Plate V. figure 4. Owen, 1855, Geol. Rept. Minn., Iowa, and Wisconsin. C. mucronata, Meek and Hayden, 1858. Proceeding Acad. Nat. Sci. of Philadelphia. Shell not very large, greatest size one half inch long by one inch wide; outline sub-semi-circular; greatest width at hinge line; cardinal angles extended. Dorsal valve concave, flattened
 
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