CHAP. 4.] KARNÜL FORMATION.—BANAGANPILLY GROUP. 89 
estimate can hardly be made here of its thickness; while very often there 
is only a mere skin of the true diamond-bearing beds left, which itself is 
frequently in scattered outliers. 
The lie of the beds is pretty much the same as that of those groups 
سر‎ already described, namely, nearly horizontal, or 
with a gentle hading up to the west; except 
along the north-west side of the Oondootla vinee where they have 
rolled down with the other strata in a sharp dip to the north-west, 
so as to run under the limestones, &c., of the Nundycottoor plains. The 
floor of the basin over which these lowest beds were deposited was not 
very irregular. For these grits and sandstones, though so thin as a 
series, were quite sufficient to fill up the more decided depressions and 
give a very flatly undulating floor on which the succeeding limestones 
and quartzites were deposited. 
Though so thin, the Banaganpilly rocks were apparently nearly co- 
extensive with the limestone groups, asis shown by 
Distribution. : : 
traces oceurring on the eastern side of the Khoond- 
air valley near Bussuapoor, and by what we are led to consider as the 
edges of the deposit near Kurnool and along the north or left bank of 
the Kistnah river. 
Our guide in tracing out this group has been mainly the known 
deposit of Banaganpily. From it the boundaries were traced continu- 
ously westward and right round the westerly edge of the terrace below 
the scarps of. the Oopalpád plateau. The valley running due west from 
Banaganpilly and thence round to the south-west is so deeply worn 
through the KARNUL rocks into those of the KaDAPAH formation that 
all connection with the former to the north is completely cut off. There 
was, however, no difficulty in recognizing each group again on the oppo- 
site side of the valley, so the group in question was traced to the old 
diamond workings of Gooraman Conda at which point Mr. Foote had 
taken it up. In carrying on his work to the northwards he was led to 
M Conse.” ) 
