Pustula nebraskensis (Owen) 



Marginifera wabashensis (Norwood and Pratten) 



Spirifer boonensis Swallow? 



Squamularia perplexa (McChesney) 



Composita subtilita (Hall) 



Schizodus amplus Meek and Worthen 



The Boggs member occurs as an iron ore in Jackson Township, 

 where it is found on the ridges of Frazeysburg. 



Licking County. The Boggs limestone extends westward from 

 Muskingum County into Licking. Isolated patches of cherty lime- 

 stone from 3 inches to 1 foot in thickness were observed at several 

 places along the ridges south of Toboso and north of Black Run. 

 In a few localities the limestone is replaced by siliceous iron ore. 



Tuscarawas County. The blue limestone by Dr. Edward Orton, 

 two miles northwest of Bolivar in northern Tuscarawas County on 

 the farm of Joseph Hair and elsewhere in the county, belongs un- 

 doubtedly to the Boggs horizon. The geologic section northwest 

 of Bolivar is given below: l 



Ft. In. 



1 . Gray or Putnam Hill limestone 2 



2. Concealed 25 



Coal 1 ft. 8 in ) [ 



3. Slate 9 in j> Tionesta < 4 9 



Coal 2 ft. 4 in J (No. 36) [4 9 



4. Concealed 15 



5. Dark-blue limestone, Upper Mercer 3 



6. Coal, thin, 4 to 6 in 6 



7. Concealed 30 



8. Blue limestone, Lower Mercer 4 



9. Dark shale 2 



10. Coal, thin 



11. Dark shale 2 



12. Fire-clay : 6 



13. Concealed 20 



14. Blue limestone (occurs occasionally at this horizon) 



Boggs 1 6 



15. Concealed to canal 15 



Summary 



The Boggs member, although occurring in patches, has been traced 

 from the Ohio River as far north as Tuscarawas County. In Mus- 

 kingum County it is the second fossiliferous limestone in the Potts- 

 ville formation, and where characteristically developed, is less than 

 2 feet in thickness, hard, blue, and fossiliferous, closely resembling 

 the Lower Mercer limestone, from which it is separated by an interval 

 of about 22 feet. It is very variable in character, however, and may 

 be interbedded with or replaced by flint, shale, sandstone, or iron ore. 

 North of Frazeysburg it is entirely replaced by iron ore, while in 

 Tuscarawas County, it is represented by limestone. In southern 



iQrton, Edward, Geol. Surv. Ohio, Vol. V, p. 68, 1884. The word Boggs has been supplied by the 

 writer. 



37 



