CHAP. 1.] THE KADAPAH FORMATION. 145 
the centre of the Eeshwarnacoopum mountain.* This mountain forms 
a nucleus of quartzites with slate bands, or lowest sub-group, round 
which there is a circling band of quartzites and slates, or middle group ; 
outside of whieh, again, is another series of quartzites and slates, on 
the last of which the town of Cumbum stands. But this arrangement, 
though very closely, is not perfectly, traceable into another group- 
ing of strata further north in that part of the Nullamullays which 1s 
traversed by the Kistnah. So, in like manner, there is a triple group- 
ing of quartzites and slates on either side of the meridian of Cuddapah, 
but there is a want of resemblance in the sub-groups, and their con- 
tinuity 1s concealed by more recent deposits. 
There is a fourth or higher group of rocks m the Kistnah Nulla- 
mullays and 1n part of the Yellaconda range; but 
Fourth group. 
its relations are not at all so clear as those of the 
triple division. 
Seeing, then, this uncertainty as to which may be the highest group 
Series to be described Of the series, it is fit to begin with what are visibly 
cendi gonder. the lowest, or that group which rests on the crystal- 
line rocks, and under which none other appears 1n any part of the field. 
Strata of sueh a fundamental group are found on the western or 
Bellary side of the field; and, to all appearance, 
Fundamental beds ap- A 1 
parently along the whole the long continuous scarp extending from the 
of western edge of field. 
Tripetty hills right up to Juggernatcondat seems 
to be of one and the same group of quartzite sands and conglomerates. 
Mr. Charles Æ. Oldham traced this scarp northwards from Tripetty, 
Scarpa DI ofi south- 0 well beyond the Paupugnee river, finding 1t to 
Sangerm consist of a thick series of sands and slates, which 
is regularly overlaid by another series of slates in the broad Chey-air 
valley to the eastward, until, in the neighbourhood of the passages of the 
* N. E. of Cumbum, from 3,000 to 3,500 feet above the sea. 
t A few miles south of Kurnool. 
