\ 

 STRATIGRAPHY OF FOSSILIFEROUS MEMBERS 135 



PoUsmlle Jormation Concluded. Feet Inches 



Clay and covered __ 4 



Shale and covered , 11 



Shale, very fossiliferous, Me Arthur 1 4 



Coal blossom, Tionesta 1 3 6 



Clay___. 7 



The following fossils were collected from the impure shaly lime- 

 stone at this locality: 



Lophophyllum profundum (Milne-Edwards and Haime) 

 Crinoid segments 

 Archaeocidaris spines 

 Spirorbis sp. 



Fenestella shumardi Prout ? 

 Fenestella venusta Mather ? 

 Fenestellids undetermined 

 Septopora biserialis var. gracilis (Meek) 

 Prismopora sereata (Meek) 



Orbiculoidea meekana (Whitfield) 



Rhipidomella pecosi (Marcou) 



Derbya crassa (Meek and Hayden) 



Chonetes mesolobus Norwood and Pratten 



Productus semireticulatus (Martin) 



Pustula nebraskensis (Owen) 



Marginifera muricata var. missouriensis Girty 



Marginifera wabashensis (Norwood and Pratten) 



Spiriferina kentuckyensis (Shumard) 



Spirifer opimus Hall 



Squamularia perplexa (McChesney) 



Composita subtilita (Hall) 



Pteria ohioense (Herrick) 



Myalina pernaformis Cox 



Myalina swallovi McChesney 



Posidonia ? acosta (Cox) ? 



Aviculopecten coxanus Meek and W3rthen 



Aviculopecten herzeri Meek 



Acanthopecten carboniferous (Stevens) 



Schizostoma catilloides (Conrad) 

 Phillipsia trinucleata Herrick 



Samples of black flint were obtained from the Ogan farm in the 

 southeastern part of Section 14, same township, four miles northeast of 

 McArthur. Here the member is composed entirely of extremely hard, 

 unusually fossiliferous flint and reaches the exceptional thickness of 6 

 feet as shown below (Locality 92): 



