CHAP, 1.] THE KADAPAH FORMATION. 153 
the Yellacondas is tolerably wide (Plate V, Figs. J-5). And, 
like manner, the other lines of faulting shown in the map along 
this side of the country, have been introduced where no conceivable 
natural lie of the rocks can be brought forward to aecount for such an 
abrupt juxtaposition. 
Mr. Foote considers that most of the eastern boundary, so far as he 
NTC Bote’. nbtes Uh examined it, * is faulted,—a much more decided 
EE E ofi field. view than that of Mr. Charles Oldham or myself 
regarding the rest of the same boundary to the south; on this account, 
it is better to give Mr. Foote’s own description of that part of the 
country — 
“The great fault which divides the KADAPAH rocks from the older gneissic 
series in the Nellore country along the east base of the Yellaconda range, was, in all 
probability, formed prior to the great period of denudation, which gave to the country a 
shape not far different from that it now possesses. It was accompanied by a great 
upthrow on its eastern side, the true basement-bedst of the KADAPAH series being 
exposed in several outliers. In these the lowest beds are seen raised to levels equal to 
those occupied by the middle or upper members of the series at the nearest points 
in the adjacent mountains (Yellacondas). This is particularly well seen in tke great 
outliers capping the mountain mass twelve miles north of Oodagherry, and locally 
known as the Byrawoodiconda ; the contrasting relations of the strata in the outlier 
and in the main ridge of the Yellaconda being exhibited." 
These remarks were written with reference to about the middle 
portion of the range, but the further northern extension is again referred 
to as follows :— 
“The principal line of boundary appears to be formed from end to end by a 
succession of faults which upraised the older gneiss rocks. On the east side the 
upraised gneiss region appears to have undergone most tremendous denudation and 
to have had the once superincumbent series of rocks, many hundreds and possibly many 
thousands of feet in thickness, removed from its surface in toto, and besides that, to 
have been itself planed away to a great extent." 
* The whole extent, from 15? N. Lat. up to and beyond the Kistnah, with the excep- 
tion of some trifling spaces subsequently examined by Mr. C. Æ. Oldham. 
T It is not so clear that these are the true basement-beds; possibly they are Byren- 
condas and outliers of the same beds in the northern part of the Yellacondas.—W. K. 
Gels!) 
