DIY History | Transcribe | Scholarship at Iowa | 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 87

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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 87

86.

ations; over the surface are two sets of spines, one set of which is large and erect, the other set is composed of small appressed spines.
     Surface of dorsal valve marked by small concentric ridges and striations, and many pits. There are also small, short, appressed spines.
Geol. Pos. and Loc. -- Des Moines and Missouri stages at Winterset, Iowa; La Salle, Illinois, etc.
Reference Final Rept. U.S. Geol. Sur. of Nebraska.

[underlined]Productus longispinus[/underlined], Sowerby.
Productus flemingii, P. spinocus, Sowerby, same reference Productus lobatus, Sowerby, same work, Vol. IV.
     The following specific names have been given to this species: -- setosa, Phillips, 1836; capacii, d'Orbiguy, 1843; tubarius, de Keyserling, 1846; Wabashensis, Norwood and [?Bratten?], 1854; splendens,

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86. ations; over the surface are two sets of spines, one set of which is large and erect, the other set is composed of small appressed spines. Surface of dorsal valve marked by small concentric ridges and striations, and many pits. There are also small, short, appressed spines. Geol. Pos. and Loc. -- Des Moines and Missouri stages at Winterset, Iowa; La Salle, Illinois, etc. Reference Final Rept. U.S. Geol. Sur. of Nebraska. [underlined]Productus longispinus[/underlined], Sowerby. Productus flemingii, P. spinocus, Sowerby, same reference Productus lobatus, Sowerby, same work, Vol. IV. The following specific names have been given to this species: -- setosa, Phillips, 1836; capacii, d'Orbiguy, 1843; tubarius, de Keyserling, 1846; Wabashensis, Norwood and [?Bratten?], 1854; splendens,