APPENDIX. 305 
east, and the fault line last referred to runs north 5° west, so their course 
is soon cut off, and they terminate in an acute angle about two miles 
south of Peddavaram. There has evidently been an anticlinal fold with 
elliptical ends here extending from the Oostapully to the Peddavaram 
hill, the ridge of which has been entirely denuded away. 
DESCRIPTION OF Srction No. III. 
From Nemalipuram to Cautranepully, 11 miles. 
The beds cut across by this line of section are the same, till the 
Pulichinta ridge is crossed, as those exposed in Section II. East of the 
fault, however, by which the quartzite bed (Wo. 7) of the ridge is so sud- 
denly cut off we come upon the gneissic rocks, showing that a very 
great upheaval has taken place here and the entire series of beds 
(probably not less than 2,000 feet thick) cut away by denudation. The 
gneiss-spread thus exposed is bounded by four lines of fault, forming a 
four-sided figure having its longer diameter from north to south, a 
distance of about one and half miles. The northern end of the figure 
is rather narrower than the southern, which cuts across the foot of the 
Cuchillabode hill; all the boundaries are covered up either by talus or 
forest, which is here very thick. East of this gneiss-area the series of 
beds reappears, and agrees on the whole with the succession seen in the 
corresponding part of Section II, the principal point of difference being 
that the slate band (/) is replaced by a great thickness of limestone of 
whitish grey, banded grey and white, or grey limestone of great beauty 
and purity. ‘The quartzite and diamond-grit series (Vo. 6) here shows 
a slate bed intercalated so as to divide it into two divisions, both of 
which have been worked for diamonds. Other small local slate beds 
split up the series still more, but further south they seem to disappear. 
To the north these diamond beds can be traced up to the Taduvayi 
nullah, but there disappear, probably cut off by a continuation eastward 
of the fault from the north boundary of the upheaved gneiss area. 
2 P i 905 5) 
