STRATIGRAPHY OF FOSSILIFEROUS MEMBERS 127 



Section measured in pit of Central Refractories Co., Lexington, 



Perry County 



Feet Inches 

 Shale, gray _* 20 



Shale, blue, concretionary, sparingly^ f 



fossiliferous.. . \ McArthur _ ___'_] 8 



Limestone, ferruginous, fossiliferous 5 



Shale, calcareous, fossiliferous I L__ 5 



Coal, Tionesta 1 



Clay, part siliceous 11 8 



Strata measured at mine of Ludowici Celadon Co., Section 7, 

 Pike Township, Perry County 



Feet Inches 



Shale, blue 20 



Shale, blue, concretionary, sparingly*! 



fossiliferous > McArthur 1 8 



Limestone, impure, very fossiliferous J 1^ __ 4 



Coal ____, ] r__ 9 



Shale > Tionesta < __ 1 



Coal J I 1 4 



Clay 3 



Flint, black, irregular, Upper Mercer 1 



Coal, Bedford 1 



Muskingum and Coshocton Counties. North of Perry County 

 the McArthur member has been found in a number of places, but the 

 deposit is thin and sparingly fossiliferous. In most cases, however, if 

 it is present, it forms a part of the mass of shales which occupy the 

 entire interval between the Tionesta horizon and the Putnam Hill 

 limestone of the Allegheny formation. 



Summary 



The McArthur member is generally represented by calcareous 

 shale, although impure limestone and sandy shale may mark the hori- 

 zon or may be interbedded with the calcareous shale. At the type 

 locality near McArthur in Vinton County, the limestone phase is well 

 developed. The stratum is bluish-gray to almost black in color and is 

 everywhere extremely rich in fossil remains. The member is also well 

 developed in Jackson County as far south as Monroe Furnace, and ex- 

 tends northward into Hocking, Perry, Muskingum, and Coshocton 

 counties. In thickness it varies from 1 to 15 feet, and it forms the 

 fifth member of the series of marine limestones of the Pennsylvanian 

 system in Ohio. 



The complete list of fossils collected from the McArthur member 

 follows: 



