CHAP. 8.] KADAPAH FORMATION.—CHEY-AIR BEDS. 189 
There must be very little iron in this variety of the rock consti- 
tuting these bands. From Yadakee northwards, the band becomes 
somewhat more ferruginous, and the rocks are generally of a red color: 
while the laminated jasper beds, or beds of shale and chert, begin 
to show more particularly, until at the northern extremity of the out- 
crop south-west and west of Naradacherla, the series has become 
quite marked with red and brown ferruginous jasper beds, banded in 
red jasper, red hematite, white and dirty chert and coarser brown 
ferrugmous cherty layers. The series is still between two flows of 
trap, as it appears to be throughout the whole extent of the 
outcrop. 
The lowest beds for the longest part of the outcrop, that is, from 
its first appearance in the Poolavaindla hills west 
of Cuddapah up to the neighbourhood of Ryal- 
cheroo north of the Penn-air river, are essentially slaty and calcareous 
Beds of limestones. 
shales of pale, purple, and grey colors. The beds are more calcareous 
as they are followed upwards in the series, until the bands of limestone 
are reached. "These bands of limestones are interesting, as they show, 
perhaps more than any others in the series, evident signs of alteration, 
probably brought about by the outpouring of the great flow which over- 
lies them. They are generally grey-colored and finely crystalline, in thick 
beds, and are laminated and segregated in a peculiar way, with seams 
of amorphous silicious matter between the segregations. The lamine 
are contorted, undulating or sinuous, which is not the case with the 
beds themselves: and these waving lamine are always strongest to- 
wards the upper surface of the beds, and in the upper beds. The an- 
nexed figures are from one of the beds near the village of Soora- 
pully in the valley inside of the great Jootoor flow of trap some 
eight miles south of the Penn-air; and the same band of limestones 
shows all the way to the south with very much the same style of 
segregation. 
) ۱199 7) 
