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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 93

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[page]92[/page] margins regularly curved. Dorsal valve not very deeply concave, no mesial ridge. Ventral valve, moderately convex, no traces of mesial sinus, except flattening of valve along the median line; ears slightly compressed, beak large, incurved. Surface of both valves marked by concentric ridges and by numerous, small, oppressed spines, which are smaller on the dorsal than on the ventral valve. Geol. Pos. Coal Measures of Illinois, Iowa, Nebraska, etc. Reference.-- Trans. Chicago Acad. of Sci., Vol. I. [underlined]Productus punctatus[/underlined] Plate VIII. figure 1. Anomites punctatus, Martin, 1809, Petref. Derb. Trigonia rugosa, Parkinsen, 1811, Organic remains, Vol. VIII. Anomites thecar-
 
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