Vol. 65.] NUBIAN SANDSTONE, ETC. SOUTH OF KHARGA OASIS. 



45 



B. — The great mass of this hill is a coarse-grained pink horn- 

 blende-granite, with dykes of harder felsitic rocks. The summit of 

 the boss is covered with large blocks showing characteristic granite- 

 Aveathering (fig. 1, p. 44). The actual junction with the sedimentary 

 rocks was not observed ; but at the western end of the hill, in close 

 proximity to the igneous rocks, brown, black, yellow, and purple 

 ferruginous grits and sandstones were met with, dipping at 30° 

 west-south-westwards, directly away from the crystalline rocks. 



The marked and local tilting of the sedimentaries in the imme- 

 diate neighbourhood of the igneous rocks appeared to me most 

 suggestive, as obviously the inclination of the beds was far too high 

 to be explicable as being a ' dip of deposition ' on a shelving shore- 

 lino. It was the difficulty of explaining the appearances here, other 

 than on the supposition that the granites were intrusive, which 

 first made the latter idea appear possible. 



C & D. — These are small isolated exposures of pink granite, to 

 the west of the large boss just described. The junction with the 

 surrounding sedimentaries is not visible at either place. Some 12 

 kilometres farther west lies a range of prominent sandstone-hills ; 

 and it was noticeable, even at that distance, that in one locality 

 the beds showed marked tilting. The position of the disturbed 

 beds, on being plotted, proved to be exactly on a line drawn 

 though B, C, and D, and one is tempted to connect it with an 

 underground extension of the crystalline ridge. The point is at 

 least worthy of investigation. 



E. — The actual exposure at this place is very small, but the 

 facts observable are of the highest importance. The crystalline 



Fig. 2. — Plan and section of Exposure fi, 01 , Jcilometres soulh of 

 Beris (Kharga Oasis). 

 W. G E. 



[G = Granite, etc. 



rock is medium-grained pink and grey granite, associated with black, 

 close-grained basic rocks. The sedimentary deposits are plainly 



