991 



1896.] ■^-"- |S;nith. 



Spiriferina cristata Schlotheim. 



FistuUpora nodulifera Meek. 



Rhombopora lepidendroides Meek. 



Septopora Mserialis Swallow. 



Aviculopeeten coxanus Meek and Wort hen. 



A. germanus Miller and Faber. 



Lima retifera Shumard. 



Macrodon carionarius Cox. 



31. tenuistriatus Meek and Worthen. 



M. ohsoletus Meek. 



Astartella vera Hall. 

 A. newberryi Meek. 



Edmondia nehrascensis Geinitz. 



Pleurotomaria tenuicincta Meek and Worthen. 



P. conf. speciosa Geinitz. 



Ortlwceras cribrosum Geinitz. 



Phillipsia diftonensis Shumard. 



Calamites sp. 



A fauna of proba])ly the same age has been described from the upper 

 part of the Wyoming Valley limestones of the Upper Productive Coal 

 Measures of Pennsylvania.* 



Fayetteville Shale. 



In Scott county, 3 N., 29 W., section 36, near the centre, C E. Sie- 

 benthal and J. F. Xewsom discovered a bed of brown thinly laminated 

 shale, with some sandy layers, containing pyritiferous nodules in which 

 Ooniatites ( GlypMoceras) conf. spJimricus Martin was found in a good 

 state of preservation. In the shale itself were found many poorly pre- 

 served specimens of the Ooniatites conf. spJimricus, and countless speci- 

 mens ot Posidonomya {Lunulicardium) couf. fragosum Meek, also many 

 specimens of OrtlioMra& sp. 



These were at first thought to belong to the Coal Measures, but a very 

 similar bed of shale, with the same fossils in the identical state of pre- 

 servation, were found at Moorefield, Independence county, in the Fay- 

 etteville shale, which probably corresponds to the Warsaw group of the 

 Lower Carboniferous. 



Comparison with the Permo-Carboniferous of Kansas and 

 Nebraska. 



It will readily be seen that the fauna of the Upper Coal Measures of 

 Arkansas bears a strong resemblance to that of the youngest Paleozoic 

 beds of Nebraska, described as Permian by Prof Geinitz in his mono- 

 graph, " Carbonformation and Dyas in Nebraska." 



F. B. Meekf redescribes this fauna, and comes to the conclusion that 



*Penna. Qeol. Survey Ann. Rep., 1886, pp. 437-158, C. A. Ashburner and A. Heilprin,^ 

 " Report on the Wyoming Valley Limestone Beds." 

 ■f Final Report U. S. Geol. Survey Nebraska, p. 128, et seq. 



