1833.] Second Report on the Geology of Hyderabad. 399 
out the granite in nests and beds; my knowledge of it is yet too Hemted: 
to decide on its nature. 
The granite very frequently contains angular and rounded masses of? 
a micaceous granite, which appear to have been enclosed in it when in 
a fluid state; at times the edges of these masses are commixed with 
those of the containing rock, and at others the adhesion is so loose as 
to allow the mass to fall out, as the more easily decomposable matrix 
wears away. Ihave seen these masses, through the whole extent of 
the granite country ; and it first suggested to me the probability of the 
contemporaneous formation of the whole. 
I may here observe, that the specific gravity of these masses is greater 
than that of their matrix, as is also their infusibility, from the elt 
quantity of mica they contain. 
The granite of the Godaveri at Papkunda is never in concentric 
layers. It contains half-formed garnets and micaceous iron ore. 
The felspar of some specimens has a very pearly lustre: this mineral 
is sometimes wanting, and the rock then consists of quartz and garnets, 
with a few specks of micaceous iron ore. 
At Bejwdra the granite is slaty (gneiss), with an eastern dip at an 
angle of 70 or 80 degrees; the felspar is more abundant. In some 
irregular veins of earthy carbonate of lime, I found earthy grey man- 
ganese ore. 
' At Ghartbpet, a few miles from Paltnshah, the rock which I bee 
lieve to be a continuation of the Kainikgiri range and connected with 
the granite of the province, is acompound of mica, kyanite, garnets, 
quartz, and felspar. If the rock were at all slaty, its name would be 
mica slate; it is however not at all schistose, but a solid mass of 
rock three hundred feet in height, and four or five hundred in length. 
Trap veins. 
The trap veins. which run through this rock constitute the most 
remarkable fact inits history. They consist of hornblende rock, green- 
stone, greenstone porphyry and basalt, containing minute crystals of fel- 
spar. They are found in every part of the granite, and have generally 
the same direction, nearly E. and W., with a zigzag course of various 
length and breadth. 
. Some of them have been traced fifteen or twenty miles, their breadth 
varying from a few feet to 100, 200 and 300; at times their edges are 
commixed with those of the granite: the central masses affect a rhomboi- 
dal form, which in the course of their decomposition become rounded, 
In a few instances I have seen these trap rocks in beds which do not 
appear to have any particular directions. 
