GRANITIC AND TRAPPEAN ROCKS. 61 



to the north- west and cut off abruptly to the south-east near Chillaman= 

 chen. At the north-east end the traps have more of a bedded look, and 

 from this point the inter-bedded or extravasated character of the out- 

 crops becomes more evident as the Paremkonda ridges are neared. The 

 hills immediately west of Kandra show more frequently the dyke form 

 of intrusion, while the Chillamanchen hills are so devoid of any dyke-like 

 development, except on their flanks, that they look more like a great mass 

 or centre of outburst. Immediately west of the latter village, the small 

 group of dark-coloured moderately-rounded hills consists in the main of a 

 dense blue-black aphanitic greenstone, which weathers of a dark red- 

 brown colour, occasionally into large rounded masses, or into an earthy 

 rock speckled with little rounded masses of dull carbonate of lime. On 

 the west side of the main hill there is a broad dyke striking east-by- 

 north to west-by-south through the rest of the trap and across a narrow 

 band of quartz-rock and talc schist, which is also in among the traps and 

 has a north-west strike (the strike of the Cuddapah quartzites on the 

 top of the cone is nearly north-south). Armenpadi, about 3 miles 

 north-north-west, is a compact fine-grained blue-black aphanite, the 

 ridge to the north-west being also composed of coarser trap weathering 

 into great rounded masses. Kandra village is on trap which can be 

 traced, associated with hornblendic schists, thence to Vendodu; and 

 northwards from the latter village the path to Vadacherla passes over a 

 series of hornblendic schists traversed by, and interbedded as it were with 

 traps in the same way as in the Kandra valley. The schists are con- 

 torted, but strike generally north-north-west. 



The dykes intersect each other both here and in the Eapur country, 

 but without giving any indications of different periods of intrusion : 

 both those across and with the strike of the country rocks appeared to 

 belong to the same outbursts. 



The obscure association of the traps with the country rocks is to be 

 seen on the western edge of the Kandra area. On the Vizinagram side, 

 highly contorted' beds of micaceous and hornblendic schists, with frequent 

 small seams of granite and small trap dykes, border the trap mass of the 

 hill. The strike of the schists is north-north-west with various dips, 



( 160 ) 



