Art. IX.] Watson, Manganese Ore-Deposits of Georgia. 149 



Previous Work. — Some of the more important deposits of 

 manganese occurring in the Paleozoic area of Georgia were 

 studied to some extent previous to 1890 by Dr. Penrose ;^ and 

 again in the early nineties by former State Geologist, J. W. 

 Spencer.^ In a recent paper published in the Transactions, on 

 the "Geological Relations of the Iron-Ores in the Cartersville 

 District, Georgia," Dr. Hayes^ briefly mentions the manganese- 

 ores of the same district. 



Distribution of the Manganese-Ores. — Georgia is divisible 

 into three geologically-distinct areas which, named in order 

 from southeast to northwest, are (a), the Coastal Plain ; {p), the 

 Crystalline Area ; and [c), the Paleozoic Group. The areas 

 are sharply marked one from the other by two strongly defined 

 structural lines. First, the fall-line, which crosses the State in 

 a slightly south of west direction, passing through or near the 

 cities of Augusta, Macon and Columbus, separates the Coastal 

 Plain sediments on the southeast from the Crystalline area. 

 And second, the Cartersville overthrust fault separates the 

 Crystalline area from the Paleozoic area on the northwest. The 

 position of both the fall line and the Cartersville fault are indi- 

 cated on the sketch-map (Fig. i) by the heavy broken lines. 



The manganese ores are limited in occurrence to the north- 

 ern part of the State, distributed irregularly to some extent 

 over parts of both the Paleozoic and Crystalline areas. The 

 commercially important deposits are confined to the northwest- 

 ern part of the State in the Paleozoic area. Small shipments, 

 not amounting to more than a few tons in all, have been made 

 of ores mined in different parts of the Crystalline area. No de- 

 posits of manganese are }'et known to occur within the limits of 

 the Coastal Plain. 



Fig. I, a sketch map of the northern half of Georgia, 

 shows the distribution of the manganese-deposits in the State, 



' '-Manganese: Its Uses, Ores and Deposits," Annual Report of the Arkan- 

 sas Qeol. Survey, vol. i, p. 417 et seq. 



^ "The Paleozoic Group," Geol. Survey of Georgia, 1893, pp. 190-209. 



' Trans., xxx., 403-419 (1901). 



