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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 91

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[page]90[/page] line. Surface of this valve marked as on the other; and by tubercular spine bases. Geol. Pos. and Localities;-- Throughout Missouri Stage. Reference.-- Geol. of Missouri, Vol V p. 47. [underlined]Productus semireticulatus[/underlined] Plate VIII. figure 6. Anomites semireticulatus, Martin, 1809, Petref. Derb., page 7. Productus Scoticus and Pantiquatus, Sowerby, 1814, Mineral Conchology. Productus semireticulatus, de Karinek, Mon. Gen. Prod. Several other names have been assigned. Shell rather large, bearing the general characteristics of the genus. Dorsal valve deeply concave, marked by radiating costae and concentric lines of growth.
 
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