78 POTTSVILLE FAUNA OF OHIO 



Pleurophorus oblongus Meek 

 PJeurophorus tropidophorus Meek 

 Astartella concentrica (Conrad) 

 Astartella newberryi Meek 

 Astartella varica McChesney 

 Cypricardinia ? carbonaria Meek 



Pharkidonotus percarinatus (Conrad) 



Patellostium montfcrtianum (Norwood and Pratten) 



Euphemus carbonarius (Cox) 



Euphemus nodocarinatus (Hall) 



Pleurotomaria newportensis White ? 



Schizostoma catilloides (Conrad) 



Orthoceras isogramma Meek 

 Pseudorthoceras knoxense (McChesney) 



Phillipsia sangamonensis Meek and Worthen 

 Phillipsia trinucleata Herrick 



Coshocton County. The Lower Mercer limestone was observed in 

 Opossum Hollow in the southwestern part of Washington Township, 

 where it consists of hard blue, moderately fossiliferous limestone, four 

 feet in thickness (Locality 50). * The forms collected are listed below: 



Crinoid segments 



Rhombopora lepidodendroidea Meek 



Derbya crassa (Meek and Hayden) 



Chonetes mesolobus Norwood and Pratten 



Productus cora d'Orbigny 



Productus semireticulatus (Martin) 



Pustula punctatus (Martin) 



Marginifera muricata var. missouriensis Girty 



Marginifera wabashensis (Norwood and Pratten) 



Entolium attenuatum Herrick 

 Entolium aviculatus (Swallow) 

 Astartella concentrica (Conrad) 



Tuscarawas County. In Tuscarawas County the Lower Mercer 

 member outcrops in various places but no collections of fossils were 

 made. It consists for the most part of hard, blue limestone, 3 to 6 

 feet jn thickness. The geologic section showing the member with its 

 associated rocks, measured on the farm of Joseph Hair two miles north- 

 west of Bolivar, is given in the review of the Boggs horizon. About 

 three miles to the southeast of this point is the village Zoar, from which 

 the stratum was named by Newberry in 1874, on account of the excellent 

 outcrops in the vicinity. 



*See geologic section measured in Opossum Hollow under discussion of Lowell- 

 ville member, p. 34. 



