122 POTTSVILLE FAUNA OF OHIO 



Feet Inches 



Shale, dark blue 4 



Ore, kidney, Black Flint horizon __ 8 



Shale 5 



Shale and covered 19 



Shale, very fossiliferous, McArthur 4 



Coal, Tionesta 5 1 



.The following fossils were identified: 



Crinoid segments 



Derbya crassa (Meek and Haydsn) 



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) 



Composita sp. 



Parallelodon carbonarius (Cox) 



Parallelodon tenuistriatus (Meek and Worthen) 



Myalina pernaformis Cox 



Schizodus curtus Meek and Worthen 



Schizodus affinis Herrick 



Entolium aviculatus (Swallow) 



Lima retifera Shumard 



Pleurophorus immatums Herrick 



Pleurophorus tropidophorus Meek 



Bellerophon crassus Meek and Worthen 

 Pharkidonotus percarinatus (Conrad) 

 Euphemus carbonarius (Cox) 

 Sehizostoma- catilloides (Conrad) 

 Naticopsis nan us (Meek and Worthen) 

 Sphaerodoma newberryi (Stevens) 



Pseudorthoceras knoxense (McChesney) 



The type locality for the stratum is found in the central part of 

 the county, Elk Township, in the vicinity of the town of McArthur 

 where it is represented by massive, bluish-gray argillaceous limestone 

 about 6 feet in thickness, which abounds in fossils. It is found on 

 many hills of the vicinity, but probably the best exposure of the lime- 

 stone occurs at Moore mine in the northern part of Section 17, about 

 two miles northwest of McArthur where it lies directly above the Tion- 

 esta coal and forms the roof of the mine. From the piles of limestone 

 blocks lying around the mouth of the mine easy and profitable col- 

 lecting is furnished, for the limestone possesses a great wealth of fossils 



