Vol. 65.] SANDSTONE, ETC. SOUTH OE KHARGA OASIS. 



4!) 



Hills of Folded Eocene and Cretaceous fStrata. 



I cannot omit mention here of two very remarkable eminences, 

 consisting of sharply-folded strata belonging to both the Cretaceous 

 and the Eocene Systems, which from their position are evidently 

 closely connected with the crystalline ridge formed of the exposures 

 E, B, C, and D. These folded hills are marked J and K on the map 

 (PL II). 



At J there are several hundred feet of Cretaceous and Eocene 

 beds involved, beginning with the Exogyra-Series at the base ; 

 above this come the chalky limestones containing simple corals, 

 of Senonian-Danian age. These pass up into Ojiercidina-Limestones 

 marking the base of the Eocene, while still higher lies a thick series 



Eig. 5. — Plan and section of centroclinal fold, J/7 kilometres soutli- 

 south-ivest of Beris (Kliarga Oasis). 



^g^x 



fQ= Limestones, with flint 

 T I and chert. 



.Lower _j 5 = ghelly ii mes tones. 

 Eocene. ! 4 = ]sr ummu iiti c limestones. 



^3= Operculina-Limestones. 



Upper J 2 = Cha % .limestones 



r. i with simple corals. 



Cretaceous. ) 1=feo ^ m . L { mestones . 



of Nummulitic limestones, above which are the highest and youngest 

 beds of all, limestones with an abundance of chert and flint. This 

 great mass of limestone, very hard and crystalline, is bent into an 

 elliptical centroclinal fold, with dips up to 40°. The appearance 

 of the top of the hill-mass — a ring of highly inclined rocks enclosing 

 a more or less level platform — is remarkable (figs. 5 & 6). 



The other hill, K, is a rather longer and narrower fold lying 

 immediately west of the granite-boss E ; the disturbed strata here 

 Q.J. G.S. No. 257. b 



