62 POTTSVILLE FAUNA OF OHIO 



Chonetes mesolobus Norwood and Pratten 



Productus cora d'Orbigny 



Productus semireticulatus (Martin) 



Pustula nebraskensis (Owen) 



Marginifera wabashensis (Norwood and Pratten) 



Spiriferina kentuckyensis (Shumard) 



Spirifer cameratus Morton 



Spirifer opimus Hall 



Composita subtilita (Hall) 



Schizodus mooresi Miller? 

 Acanthopecten carboniferous (Stevens) 

 Entolium aviculatus (Swallow) 

 Allerisma terminale Hall 



FOSSILS FROM THE BLACK CARBONACEOUS SHALE ABOVE THE LIMESTONE 



Crinoid segments 



Derbya crassa (Meek and Hayden) 



Chonetes mesolobus Norwood and Pratten 



Productus cora d'Orbigny 



Productus semireticulatus (Martin) 



Pustula nebraskensis (Owen) 



Marginifera wabashensis (Norwood and Pratten) 



Spiriferina kentuckyensis (Shumard) 



Spirifer opimus Hall 



Composita subtilita (Hall) 



In Madison Township excellent outcrops of Lower Mercer lime- 

 stone occur in the banks of Symmes Creek just east of the crossroads 

 and two miles from the mouth of the stream. Large blocks of extremely 

 fossiliferous, blue limestone have fallen from position in the valley 

 walls into the stream bed, and on the weathered surface large brachio- 

 pods and crinoid stems protrude (Locality 29). The species found 

 are listed below: 



Fusulina secalica (Say) 



Lophophyllum profundum (Milne-Edwards and Haime 



Crinoid segments 



Fenestella shumardi Prout? 

 Pinnatopora whitii Foerste 

 Septopora biserialis (Swallow) 

 Rhombopora lepidodendroidea Meek 

 Prismopora sereata (Meek) 



Derbya crassa (Meek and Hayden) 

 Chonetes mesolobus Norwood and Pratten . 

 Productus cora d'Orbigny 

 Productus semireticulatus (Martin) 

 Pustula nebraskensis (Owen) 

 Pustula punctatus (Martin) 



