| CHAP. 1.] THE KADAPAH FORMATION. 139 
West E Fast 
1 
NUTIT RN " 
BIETER ۱ 
iL تال‎ 
White 
Imc لد‎ 
at N 
m EN te Ee 
3 ¥ E ose 1 d n T€ 1 
& e 
Fig. 20, a and 5. Sections showing the variation in cleavage in the N ullamullays. 
Though the rocks are so well cleaved, there is not any instance 
of such perfect slates as the typical roofing slate of commerce. They 
are not sufficiently indurated for this, or if they happen to be hard 
or compact, they are so coarse in their texture that cleavage is not 
well developed in them. Generally, the cleaved rocks are moderately 
dull lustred clay-slates of dark grey, greenish, blue, and purple colors; 
but there are many examples of talcose slates of pale grey and green 
colors. Oceasionally, as along the western slopes of the Yellacondas and 
the inner ridge of hills, there are some bands of dark green, weathering 
rusty brown, chloritic and talcose slates. 
_ The best slates, or such as seem capable of being worked into slabs 
of any moderate size and thinness, are near the upper Hoblum pagoda, 
high up on the Nundycunnama pass;* and on the middle ridge 
running north from Kullsapaud.+ Slates are quarried, to some little extent, 
on the eastern flanks of the Nullamullays at about the parallel of 
* Principal cart road across the Nullamullays from Nundial to Cumbum. 
+ East side of Nullamullays, 32 miles south-south-west of Cumbum. 
C B3) 
