78 KING: KADAPAH AND KARNÜL FORMATIONS. [PART If. 
group, and so more likely to be a true breccia with interspaces full of 
sand. The subsequent alteration which these KARNÓL rocks under- 
went must, of course, have affected the character of the limestones to 
a certain extent, and the obscurity of the brecciated character of these 
beds in certain places may possibly be owing to this alteration. 
In the part of the Raichoor Doab*, about the town of Kurnool 
ee beds aban and its neighbourhood, the proper Nerjee lime- 
nool. stones themselves (irrespective of the brecciated 
band) have become distinct shore-beds as they thin out over the grits 
of the next lower, or Banaganpilly, group, or even as they have 
overlapped these and lie directly on the gneissic rocks, or their granites. 
In such eases the limestones at times are very Jaspery, or rather cherty, 
and segregated and brecciated in a peculiar manner. In no case are 
they penetrated by any igneous rocks, but they are certainly altered 
(or baked) and squeezed or crushed up locally. There is a very good 
example of this in the town of Kurnool near the powder-magazine 
(bastion of the fort): where the hitherto horizontal limestones a short 
distance west of the bastion, are bent up almost vertically in a line 
running from the bastion south-south-west to the village of Culloor, and 
are seamed with calcareous chert, jasvers, and silicious incrustations in 
the most marked way. The limestones here are very silicious, and 
they are lying directly on rather peculiar rocks of the older erystallines 
which may possibly have been igneous themselves. It would then 
appear that when these limestones were being deposited along the shore, 
or at any rate not far from the shore of that period, that debris of 
the older quartzite beds (Banaganpilly beds) and of the gneissie and 
granitic rocks became washed into and incorporated with the lower strata 
of the rock; and that the diverse composition of the beds gave cause for 
partial segregation, during metamorphism, into the peculiar forms 
* The Raichoor Doab is the eastern part of the country between the Kistnah and 
Toongabudra. 
۰ ۵ ( 
