proceedings: geological society 387 



Large bodies of the higher oxides and hydrous oxides of manganese, 

 accumulate near localized bodies of carbonates and silicates when 

 these are thoroughly weathered. In several regions, however, the 

 occurrence of many manganese oxide deposits on the remnants of old 

 erosion surfaces where the nearby sedimentary rocks are deeply weath- 

 ered and the sources of the manganese are consequently obscure, indi- 

 cates that under conditions of peneplanation there is an opportunity 

 to accommodate in small areas the manganese that was formerly 

 widely disseminated through the rocks. 



R. W. Stone, Secretary. 



