CHAP. 3.] KADAPAH FORMATION.—CHEY-AIR BEDS. 191 
“The same very ferruginous band or bands continue, and the broken pieces which lie 
about abundantly are carried down for smelting at Nerrabyle (Nerrabylegudda of map). 
* Further east, towards Jonelroshy Coopa, the quartzites come lower down and 
form fully half the height of the hill, and here there appears a greater thickness of 
what is usually the upper bed, a hard grey coarse quartzite, of which there is here and 
round by Tellaralpate* and eastwards to Toombarkona, &c., a very considerable 
thickness rising to a greater elevation than in any other part of the district. From 
this south-south-east and eastwards, north of Tripetty, the hills rapidly diminish in 
height towards Kirkumbady (Curcumbode) where the quartzites are found forming 
the base of the hills.” 
Thus far the edge of the field is a natural boundary, the scarp of 
the lowest beds lying along up the slope of the 
Boundary between 
Naggerys and CRYS- hills, and so it continues until near Kirkumbady, 
TALLINES a natural one 
until near Kirkumbady. ^ where the Naggerys and the gneiss are brought 
into juxtaposition. -Some distance further east, the next sub-group of 
slates which are overlying these quartzites in the low valleys, by which 
the railway from Madras to Cuddapah enters the field, are also brought 
into juxtaposition with the gneiss ; and finally in the southern extremity 
of the Yellaconda or eastern gháts, there is a roll up of the strata by 
which the bottom quartzites are partly brought up to the surface, and 
ultimately, with their overlying slates, roll down sharp to the east and lie 
in contaet with the gneiss on the Nellore side of the country. 
There is thus a more or less east and west line of fault along the 
Ta eens ada emit southern extremity of the field by which the 
downthrow of 1,000 feet. xapapans have been thrown down to the north 
to the extent of fully 1,000 feet at the eastern end of the line. 
Tadapurtee (Poolumpett) slates, with limestones. 
On again taking up the most perfect section of the rocks, on the 
Polen aiutato western side, from the base of crystallines upwards, 
overlaid by a slate series. i+ turns out that the typical Poolavaindla (Nag- 
gery) quartzites are overlaid by a great series of slaty? shales with 
* Tellaralpate is given in the Trigonometrical Survey Records at 3,824 feet above sea level. For access to 
these Records I am indebted to the kindness of Colonel Priestley, Superintendent, Revenue Survey, Madras 
Presidency.—C. Æ. O. 
(Ter ) 
