STRATIGRAPHY OF FOSSILIFEROUS MEMBERS 17 



Feet Inches 



Pottsville formation 



Shale, blue 3 



Shale, dark, fissile __ 10 



Clay, siliceous ._ 1 10 



Ore, siliceous 1 3 



Shale f Harrison 1 __ 1 



Ore, siliceous I [__ 3 



Maxville limestone to* 6 



SHARON ORE 

 Stratigraphy and Extent 



The next fossiliferous member of the Pottsville formation above 

 the Harrison ore, namely the Sharon ore, is of very limited outcrop, 

 and with the exception of Mahoning and Trumbull counties, is found 

 only in the extreme southern part of Ohio, in the eastern part of 

 Scioto and Pike counties and in Jackson County. 1 The ore is very 

 patchy and uncertain, and where present, either lies directly on the 

 Sharon coal (Jackson Shaft coal, or Coal No. 1) or is separated from 

 it by not more than 15 or 20 feet of sandstone and shale. In Jackson 

 County it forms a deposit from 4 to 6 inches thick, while in Pike and 

 Scioto counties it reaches a thickness of 10 inches to 1 foot 6 inches. 



% 



The ore is buff or brown in color, highly siliceous, and coarse in texture, 

 and is filled with numerous decomposed fragments of Mississippian 

 material. Living conditions during the period of deposition of the 

 Sharon ore were such as to support an abundant fauna, which, how- 

 ever, is small and dwarfed in aspect, owing probably to the high per- 

 centage of iron which the waters contained. The fossils which are for 

 the most part well preserved generally occur as casts of the interior as 

 in the case of the Harrison ore. 



Description of Geologic Sections and Collecting Localities 



Scioto County. In Section 14, Porter Township, at the mouth of 

 Lick Run, the ore is exposed on the farm of Joseph Jenkins, where it 

 is extremely fossiliferous and furnishes good collecting material; the 

 fossils resemble to a marked degree those of the Harrison ore both in 

 species and condition of preservation. The deposit is brown in color 

 and contains much soft, light brown, chalky material formed by the 

 decomposition of inclosed pebbles. The section at this locality follows 

 (Locality 2): 2 



'Stout, W., Geol. Surv. Ohio, Fourth Ser., Bull. 20, pp. 71, 455, 493, 1916. 

 2 Idem., p. 494. 



