STRATIGRAPHY OF FOSSILIFEROUS MEMBERS 81 



Bulimorpha inornata (Meek and Worthen) ? 

 Sphaerodoma brevis (White) 

 Sphaerodoma regularis (Cox) ? 



Pseudorthoceras knoxense (McChesney) 



An excellent outcrop of Lower Mercer limestone occurs in Section 

 2, Pike Township, in the valley of Nimishillen Creek just north of 

 Howenstein, where the geologic section below was measured: 



Section in valley of Nimishillen Creek, Pike Township, Stark County 



Feet Inches 



Allegheny formation 



Limestone , f ossilif erous, Putnam Hill _ 3 7 



Shale __ i 



Coal, Brookville 1 Q 



Pottsville formation 



Clay, gray 6 



Shale and covered 19 3 



Shale 30 



Ore, Upper Mercer 2 



Limestone, dark, fossiliferous, Upper Mercer 2 



Coal, bony, Bedford 1 4 



Clay, dark 1 4 



Canister, light 1 6 



Shale and ganister '1 6 



Shale, gray 19 4 



Limestone, ferruginous, f ossilif erous_\ 7- ,,- / 1 



. _ !/ I -LjOwVT JVJ. tsTCCT 'S 



Limestone, gray, fossiliferous J k 1 3 



In the northern and eastern parts of the county the member has 

 been penetrated in mines and well drillings. To the east the limestone 

 is sometimes replaced by shale, but where present, it often reaches a 

 thickness of about 3 feet. The geologic section below was taken at 

 Aultman, in Section 30, Lake Township, at the mine of the National 

 Fire Proofing Co. 



Feet Inches 



Shale 20 



Limestone, blue, fossiliferous, Lower Mercer 1 8 



Shale __ 4 



Coal, bony, Middle Mercer __ 10 



Summit and Portage Counties. In Summit and Portage coun- 

 ties the Lower Mercer member, where exposed, is similar to the deposits 

 elsewhere in northeastern Ohio. 



Mahoning County. The member is well developed in Mahoning 

 County and consists characteristically of two benches of hard blue lime- 

 stone, generally without shaly partings between them. Black, ex- 



