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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 227

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PLATE VIII. 1, a, b. Productus punctatus. 92 2, a, b, c. Orthis pecosii. 96 3, a, b, c. Eutiletes hemiplicatus 97 4, a, b, c. Rhynchonella (Pugnax) Uta 99 5, a, b, c. [?Diclasma?] bovideus 101 6, a, b. Cryptacanthia compacta [?] 7, a, b, c. Spirifer plano-convexus 103 8, a, b. " [ditto for Spirifer] lineatus 104 9, a, b, c. Retzia mormoni 109 10, a, b. Spiriferina kentuckensis 108 11, a, b, c. Sperifer cameratus 106 12, a, b, c, d. Athyris (Seminula) subtilita 110
 
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