102 POTTSVILLE FAUNA OF OHIO 



and Upper Mercer members in the ravine on the east side of the Mus- 

 kingum River, one mile north of Ellis (Locality 39). " The fossils listed 

 below were found in the Upper Mercer limestone and flint: 



Fusulina secalica (Say) 

 Crinoid segments 



Chonetes mesolobus Norwood and Pratten 

 Marginifera wabashensis (Norwood and Pratten) 

 Spirifer cameratus Morton 



Fossils were obtained together with Lower Mercer forms from 

 blocks of flint fallen from place in the walls of a small ravine by the 

 roadside east of the Muskingum River and opposite Rock Cut. (Lo- 

 cality 40). The collection includes the following: Upper Mercer forms: 



Fusulina secalica (Say) 

 Crinoid segments 



Chonetes mesolobus Norwood and Pratten 

 Productus semireticulatus (Martin) 

 Marginifera wabashensis (Norwood and Pratten) 

 Spiriferina kentuckyensis (Shumard) 

 Spirifer opimus Hall 



In Muskingum Township fossils were collected from the dark 

 flinty limestone which underlies a layer of black flint in the roadbed 

 about one mile north of the Sandy Ridge School, where the entire 

 member measures If feet in thickness (Locality 67). The collection 

 includes the following forms: 



Girtyina ventricosa (Meek and Hayden) 

 Crinoid segments 



Fenestella limbata Foerste 

 Cystodictya carbonaria (Meek) 



Derbya crassa (Meek and Hayden) 

 Productus cora d'Orbigny 

 Productus semireticulatus (Martin) 

 Marginifera wabashensis (Norwood and Pratten) 

 Spirifer cameratus Morton 

 Spirifer opimus Hall 

 Squamularia perplexa (McChesney) 

 Composita subtilita (Hall) 



In the exposure along the Wheeling & Lake Erie Railroad north 

 of Rock Cut, the flint is unusually well developed and reaches a thick- 

 ness of 2 feet. It is more fossiliferous than is generally the case, 

 especially in number of individuals, and forms one of the best collecting 



