134 POTTSVILLE FAUNA OF OHIO 



A few specimens of Orbiculoidea meekana (Whitfield), which prob- 

 ably belong to the Black Fint horizon, were also obtained in Coal 

 Township just west of Wellston from the impure shaly limestone 30 

 feet above the Tionesta coal (Locality 89). 



Vinton County. In Section 34, Richland Township, near the 

 Jackman School, the Black Flint member is represented by an iron 

 ore. The following section shows the relation of the member to the 

 Tionesta coal and to the extremely fossiliferous, calcareous shales 

 which mark the Me Arthur horizon: 1 



Feet Inches 



Ore, Black Flint horizon __ 8 



Shale , .5 



Shale and covered 19 



Shale, very fossiliferous (Me Arthur] 4 



Coal, Tionesta 5 1 



The forms below were obtained from the extremely hard, unfos- 

 siliferous black flint which is exposed in the roadbed near Mt. Zion 

 School, in Section 24, Richland Township (Locality 90). The flint 

 measures 1 foot 6 inches at this locality. 



Fusulina secalica (Say) 



Lophophyllum profundum (Milne-Edwards and Haime) 



Crinoid segments 



Productus semireticulatus (Martin) 



Excellent exposures of Black Flint are present in many localities 

 in Elk Township, where the member is exceptionally thick and every- 

 where fossiliferous. Fossils are, however, present very sparingly in 

 the black flint phase, -but are abundant in the impure shaly limestone. 

 The following strata were measured in the southeastern part of Section 

 11, along the northeast-southwest road (Locality 91): 



Hock succession in the southeastern part of Section 11,~ Elk Township, 



Vinton County 



Feet Inches 



Allegheny formation 



Coal blossom, Clarion 2 



Clay. 5 



Shale with scattered ore nodules 17 



Coal blosson, Brookville 4 



Pottsville formation 



Clay-. : 1 



Flint, gray to black and impure limestone, Black Flint. __ 2 6 



Coal blossom __ 2 



'Stout, W., Geol. Surv. Ohio, Fourth Ser., Bull. 20, p. 185, 1916. 



