Art. IX.] Watson, Manganese Ore- Deposits of Georgia, 183 



Enough detail has been given to show the non-relationship 

 genetically between the manganese and the other ore-deposts. 

 We must look, therefore, to an independent theory for the 

 genesis of the manganese. The theory which best accords with 

 the facts as the writer has interpreted them is, with some modi- 

 fication, that essentially outlined previously by Penrose.* It 



Fig. 16. 



NW 



liiiiii* 





!!\\ 







Watson 



Section through the Stratham Tract, near Draketown, Georgia, Show- 

 ing Mode of Occurrence of the Ores. 



A, banded quartzite with magnetite and some pyrite ; B, decayed mica- 

 schist, in which the planes of schistosity are perfectly preserved ; C, ore, in- 

 cluding manganese and manganiferous iron-ore, magnetite and limonite. 



satisfactorily explains (i) the source from which the manganese 

 was derived ; (2) the method of solution, transportation and 

 precipitation of the manganese ; and (3) the process of its local 

 accumulation. 



I. Source of the Manganese. — The immediate source of the 

 manganese was from the rocks from which the residual decay 

 inclosing the ores was derived by weathering. Accumulation 

 was not entirely limited, perhaps, to the manganese contained 



^ Penrose, R. A. F., ' Manganese : Its Uses, Ores and Deposits," Annual 

 Report Geological Survey of Arkansas, 1890, vol. i., p. 539 et seq. 



