CHAP. 4.1 KADAPAH FORMATION.—NULLAMULLAY BEDS. 218 
Irlaconda range, they are found to overlie mottled slaty shales and traps 
which are identical with those of the Penn-air slates with limestones. On 
the other hand, however, when the Ivlaconda beds are traced eastwards 
over the Kistnah range of mountains they are found to be overlying otber 
and higher slates than these, while they show very obscure stratigraphical 
relations along the eastern half of the Dorenall valley. On this account it 
is perhaps better to leave the Kistnah beds for separate consideration 
further on. 
To the east of Cumbum, these Byrencondas rise up again from 
In the Yellacond, oder the slates, next to be described, in the 
و‎ ridge. northern part of the Yellaconda range :* and they 
are evidently represented further northwards by the lowest quartzites in 
the Vinuconda, Yipur, and Nakarikallu domes; and again by the 
lowest beds of the eastern scarps of the ridges running up to and beyond 
the Kistnah to Battavole or Juggiapett. At this point they are the 
same beds which have already been noticed as the lowest of the series on 
the north side of the Kistnah. 
In the western part of the passage of the Penn-air across the 
D Gandecstta or Cuddapah field, the Tadapurtee slate series is 
Jummulmudgoo range. overlaid unconformablyt by the quartzites of the 
Gundycotta or Jummulmudgoo hills; and therefore these beds, though 
completely insulated on all sides, are very possibly Byrencondas also. 
In the Polleonda range, south-east of Cuddapah, the rocks are coarse 
Character of stratain STIS and sands, with lower beds of pebbles and 
TET conglomerate. They lie unconformably on the 
subjacent slates with limestones, but this unconformity is obscured 
greatly by the folding which was impressed on the whole series. In the 
* And are, if there be no system of faults (see chap. 5) with inversion, likewise repre- 
sented in the whole of the eastern face of the rest of this mountain ridge. 
T The unconformity is exceedingly slight, the quartzites of the gentle north-east slope 
being only a little flatter than those in the higher part of the western scarps. But at the 
Cuddapah end of the range, the quartzites are seen to lie over different beds. 
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