MISSISSIPPIAN ROCKS OF NORTHEASTERN OKLAHOMA 619 



black clay shale of the Fayetteville shale. The correlation of these 

 rocks to the north of the Pryor quadrangle is yet in doubt. They 

 seem to keep the same general characteristics across the corner of 

 the Vinita quadrangle that they have in the Pryor. In the 

 Wyandotte quadrangle, however, there is considerable sandstone 

 in the lower part of the Fayetteville shale, or below it, which 

 SiebenthaP calls the Batesville sandstone. On a sketch map of 

 the Pryor quadrangle sent the writer he uses the field term, sub- 

 Batesville limestone, and it is understood that the same term was 

 used in the Wyandotte quadrangle. Since the Batesville sand- 

 stone of Arkansas does not extend into Oklahoma on the south side 

 of the uplift, it does not seem that the name can be used in the 

 Wyandotte quadrangle, although the sandstone there occupies 

 practically the same stratigraphic position as the typical Batesville. 

 Siebenthal's sub-Batesville limestone is almost certainly the north- 

 ward continuation of the unnamed Chester limestone formation of 

 this paper, and the sandstone called Batesville may also belong to it. 



The fauna of these limestones between the Boone and Fayette- 

 ville formations, so far as the collections have been studied, is 

 as follows: Productella hirsutiformis Walcott, Productus pilei- 

 fonnis McChesney, P. cestriensis Worthen, P. inflatus var. colorado- 

 ensis Girty ( ?) , Liorhynchus carboniferum Girty, Camarotoechia 

 pur duel Girty, Moorefieldella eurekensis Walcott, Spirifer increhes- 

 cens Hall, Reticularia setigera Hall, Seminula suhquadrata Hall, 

 Derbya keokuk Hall, Eumetria marcyi Shumard, and Deltopecten 

 batesvillensis Weller. There are also several species of bryozoa 

 in the upper part and of'pelecypods in the lower part of the forma- 

 tion that have not yet been identified. One layer of arenaceous 

 and calcareous shale near the base is marked by a large trilobite. 

 The fauna has, however, been determined with sufficient complete- 

 ness to correlate these limestones with some degree of certainty 

 with the Spring Creek limestone and the Moorefield shale and 

 possibly with the Batesville sandstone of Arkansas. 



The unconformity between this limestone and the underlying 

 Boone chert has already been noticed. In the Tahlequah and 



'C. E. Siebenthal, "Mineral Resources of Northeastern Oklahoma," Bull. U.S. 

 Geol. Survey No. 340, p. 190, 1908. 



