2,94. KING: KADAPAH AND KARNÜL FORMATIONS. 
two sets, the one striking from north to south with a little variation on 
either side, the other set, on the contrary, striking west-north-west to 
east-south-east. 
The dykes consist of a coarse greenstone; and in several of those 
belonging to the north and south set a well marked porphyritie struc- 
ture was observed, numerous crystals of pale bluish, or yellowish green, 
felspar being included. In many dykes thin films of apple-green 
pistacite occur, lining the planes of jomting. Scattered over the surface 
of the ground to the north of the traveller’s bungalow at Sheer Mahom- 
medpett on the Masulipatam and Secunderabad road is a large quantity 
of extremely rich red hematite occurring in shghtly rounded water-worn 
lumps from the size of a pea upwards to lumps weighing several pounds. 
The quantity increases northward towards the Condalama Trigonometri- 
eal Station Hill; where, among the singular net-work of trap dykes 
seaming the face of the country, the quantity of this iron-ore is 
extremely large. It presents every appearance of having been derived 
from some distant source, of which not the slightest indication was 
observed. This ore is carried by the Brinjarees to several villages in the 
Nizam’s territories west of Warrapilly (Wojerabad) to be mixed with the 
greatly inferior ore locally found there. 
Lying on the gneissie rocks is a series of rocks consisting of 
quartzites, slates, shales, and limestones, the rela- 
Newer metamorphic 
series. ۰ : o ۱ 
tions of which are (in some parts of this area) 
far from clear and obvious. 
Along the northern edge of the angle whieh terminates the great 
area of these younger metamorphie rocks they 
Nature of boundaries. 1 j ۱ 
rest upon the older gneiss quite undisturbedly, but 
on the eastern edge of the angle the boundary is in parts a faulted one. 
Between the southern part of the two ridges of hills before described a 
remarkable area of the gneissie rocks appears within the general boundary 
of the younger metamorphies, brought in by a series cf nearly parallel 
( 894 ) 
