188 | KING: KADAPAH AND KARNUL FORMATIONS. [PART III. 
of rocks that the largely nodular bands occur: they are very thin, 
only a few inches, like nearly all the other beds of shales. 
The next band of rocks worthy of attention among this series of 
Band of ferruginous Slaty shales is a ferruginous set of shales, silicious 
rete ae chert-like bands and sands, which occur low down 
in the series between two of the most marked trap flows.* These 
ferruginous beds are again very similar to others in the Gwalior rocks of 
Central India. The northern extremity of outcrop is in the hilly country 
below the western slopes of the Oopalpád plateau, just at the edge of the 
terrace of Banaganpilly quartzite. Thence, it strikes with a slight 
curve past Yadakee, south-south-east to the Chittravutty river, and so 
to the Cuddapah basin, curving round parallel with the Paupugnee river, 
where it is again covered up by the KARNULS of the southern end 
of the Nundial valley. The rocks show clearest from the Chittra- 
vutty northwards, being for many miles dark brown ferruginous shales, 
with now and then thick beds of sandstone, and banded or striated beds 
of cherty and compact silicious rocks. The shales are hard, somewhat 
porcellanie, much given to breaking up in thin jointed fragments; and 
are often replaced by brown ribboned jaspers or cherts. The uppermost 
shales and sands are rather red, and in some parts of the outcrop there 
are again higher shales, not so ferruginous, with a few limestone 
beds. | 
The following analysis of that band of this siheious rock showing 
a tendency to split up in tolerably perfect six-sided prisms was made 
by Mr. A. Tween :— 
Loss on ignition ue SN kh E AERAR 
Silica s o, re BK 97:2 
Oxides of iron and alumina do: an 2:25 
Lime 8 
10025 
* Those striking through Polamuoda and Jootoor. 
