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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 110

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[page]109[/page] sinus, also by fine striae of growth and a few spine bases. Shell having a fine punctate structure. [underlined][underlined]Athyridae.[/underlined][/underlined] In this family the primary lamellae are situated between the spiral arm supports while they are sharply recurved dorsally at their junction with the crura. Spiral arm supports laterally directed. [underlined]Retzia mormoni[/underlined], Plate VIII. Retzia punctulifera, Shumard, 1858, Trans. St. Louis Acad. Sci., Vol. I., page 220. Terebratula mormoni, Moscow, 1858, Geol. of N. America, page 51. Retzia mormoni, Meek and Hayden, 1859, Proc. Acad. Nat. Sci., Philadelphia, p.27. Retzia anbylobosa, McChesney, 1860, Descriptions New Paleozoic Fossils, p.45. Shell small, length and breadth
 
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