132 KING : KADAPAH AND KARNUL FORMATIONS. [PART Tif. 
southern part of the range, right at the gneiss. Nor again, in the 
northern part of the same range, which was more partieularly surveyed 
by Mr. Foote, ean the talus there be always brought forward as a shelter 
for what, if there were no faulting, would be a very sudden thinning out 
of the great Cumbum group, which 1n that part of the country overhes 
the quartzites of the mountains. 
In the long section taken across the country, it will be seen 
i DB iene how the different groups are thinning out to 
ME always due to the north; the Azstnah beds which are higher 
than the Cumbums becoming there bottom beds 
on the gneiss. Now, if the northern end of this section were crushed up 
and folded against the country to the south, there might be presented 
the feature of a tremendous series of quartzites apparently resting on the 
Cumbum slates and in abrupt contact against the gneiss at the boundary. 
In such ease there need have been mo faulting, always provided the 
thrust were horizontal, and that the strata were capable of being folded 
back on each other without fracture, as they have been in many 
eases now displayed in the country. 
It is very possible then that a good deal of the abruptness of the 
eastern. boundary may be due to such a set of conditions as that just 
cited: there are undulations in the ‘domes,’ foldings in the Nulla- 
mullays, and inversions in the northern part of the Yellacondas and in 
the Waumyconda and Palnád area—the folding of the curves and inver- 
sions generally being to the westward; all of which show that the 
erushing up referred to in the conditions supposed in the last para- 
graphs must have occurred. At the same time, too, there is very 
good evidence over the north-east part of the field that the groups 
there developed are thinning out overlower groups, just as they now 
do, without showing any folding over the northern edge of the country. 
A serles of cross-sections of the eastern boundary may, perhaps, 
Sein chowing abe best illustrate its abrupt and seemingly faulted 
ruptness of boundary. 
(0 RISO) 
character; they are taken where the talus below 
