STRATIGRAPHY OF FOSSILIFEROUS MEMBERS 121 



Feet Inches 



Coal 



Clay, slate with thin coal bands . 



Coal 



Clay, dark 



CoaL- 



Tionesta. 



1 2 



6 



5 



11 



10 



Clay shale, dark 1 6 



Covered 14 



Ore, Upper Mercer. m __ 4 



The fossils listed below were collected at the old Tom Corwin mine : 



Lophophyllum profundum (Milne-Edwards and Haime) 

 Crinoid segments 



Fenestella shumardi Prout? ? 

 Rhombopora lepidodendroidea Meek 



Orbiculoidea meekana (Whitfield) 



Derby a crassa (Meek and Hay den) 



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) 



Parallelodon carbonarius (Cox) 

 Parallelodon tenuistriatus (Meek and Worthen) 

 Myalina pernaformis Cox 

 Myalina swallovi McChesney 

 Aviculopecten coxanus Meek and Worthen 

 Aviculopecten herzeri Meek 

 Acanthopecten carboniferous (Stevens) 

 Entolium aviculatus (Swallow) 

 Pleurophorus immaturus Herrick 

 Pleurophorus tropidophorus Meek 

 Astartella concentrica (Conrad) 

 Astartella varica McChesney 



Pharkidonotus percarinatus (Conrad) 

 Schizostoma catilloides (Conrad) 



Pseudorthoceras knoxense (McChesney) 



Vinton County. The McArthur member is extremely well devel- 

 oped in Vinton County. In the southern portion, northwestern part 

 of Section 34, Richland Township, very fossiliferous shales outcrop 

 south of Jackman School and afford excellent collecting. The section 

 below, measured at this locality, shows the relation of the various mem- 

 bers of the upper Pottsville formation to each other (Locality 83) : l 



'Stout, W., Geol. Surv. Ohio, Fourth Ser., Bull. 20, p. 175, 1916. 



