850 



THE GEOLOGY OF THE NANDEWAR MOUNTAINS, 



creek is probably induced by a subsidence along a fault running 

 E.N.E.-W.S.W. from Kaputar in the direction of Ningadhun, 

 the plugs of Kaputar, Corrunbralborawah, Coryah, Ningadhun 



The range north of Bullawa Creek, 



being situated on this line 



Fig. 2. — IStructure of Ningadhun Eock. 

 1, Silky Arfvedsonite trachyte; 2, Black trach. glass; 3, Coarsely porph. 

 hypohyaline black trach.; 4 and 6, Red neph. phonolite; 5, Trach. breccia; 

 7, Common varieties of alk. trach.; 8, Tuffs; 9, Conglomerates and sand- 

 stones. 



Ritter's Razorback, has trachytic rocks (tufls, breccias and lavas) 

 above a height of 2,200 feet. In places these rocks become 

 andesitic, in others phonolitic. They frequently exliibit 

 spheroidal weathering and onion-structure. 



From the structure observed in the country on both sides of 

 Bullawa Creek at Ritter's as described above (Figs. 3, 4, 5) it 



