634 NORTH AMERICAN INDEX FOSSILS. 



Reddish limestone, Fern Glen limestone, Red shale, Fossiliferous 

 limestone, Bushberg sandstone, Glen Park limestone. This rests 

 disconformably upon Upper Ordovicic (Maquoketa or Kimmswick 

 limestone). 



In Arkansas the Kinderhook is wanting through overlap or rep- 

 resented only by the basal black Eureka or Noel shale (possibly 

 also the Sylamore sandstone) . The section has been subdivided 

 as follows : 



SUPERFORMATION. 



Early Pottsville (Morrow formation). 

 Upper Mississippic or Chesteran. 

 Boston group. 



Pitkin limestone. 



Wedington sandstone. 



Fayetteville shale. 

 Batesville sandstone. 



Middle Mississippic or Meramecan. 

 Moorefield shales and 

 Spring Creek limestones. 



Lower Mississippic. 

 Osagean. 



Boone limestone and chert series. 

 Boone chert. 

 Carrollton limestone. 

 St. Joe marble. 

 Chouteauan. 



Eureka or Noel black shale. 

 {D is conformity and hiatus.) 



SUBFORMATION. 



St. Clair limestone (Siluric) or various Ordovicic beds. 



The Boston group was originally subdivided in descending order 

 into the Kcssler limestone, Coal-hearing shale, Pentremital lime- 

 stone, Washington shale and sandstone, Archimedes limestone and 

 Marshall shale, the latter a part of the Fayetteville shale series. 



In Oklahoma, the Caney shale and probably the Woodford chert 



