GEOLOGY. 



175 



It is also only in these three of the valleys 

 visited that one could expect glaciers, because 

 the others which I saw do not lead directly to 

 the highest snow-covered portion of the ridge. 



Here I should like to point out again the disad- 

 vantage of not knowing what may have been the 

 condition of the Sahara in miocene times, for if 

 the Sahara was occupied by a sea, it does not 



Butaga Valley 

 (o/ac/afcc]?) 



Plan of Nyamujamba 



ey 

 CS I aa'atzcL ?) 



28. — Glaciation. 



Yer ta Valley 

 (Oros/onJ 



seem improbable that the amount of snow might 

 have been so much greater that the present 

 difference between the level of the snow, 15,500 

 feet, and that of the valleys, 5,200 feet, would not 

 be so overwhelming in amount. 



Emm Pasha seems to have found traces of 

 glaciation in this district, as also Casati, but 

 Dr. Stuhlmann has not been able to confirm this. 

 The question is certainly one worth investigating 

 by future travellers. 



