CHAP. 4.] KARNÜL FORMATION.—BANAGANPILLY GROUP. 95 
away in the scarp south-east of the village. "There is likewise a certain 
general resemblance between these and the doubtful beds. The Bana- 
gaupilly group has also thinned out and disappeared in the scarp south-east 
of Oorehintala, though it is very decided along the western face of the 
terrace as an exceedingly coarse conglomerate with grits above. There 
may still therefore have only been a thinning out of those beds to the 
eastwards, while they stretched southwards towards the outliers in 
question. Altogether itis a very open question what these outlying 
caps of quartzite may be, though the balance of evidence at present 
seems to be in favor of their belonging to the group under description. 
As already stated, this group consists of sandstone- and grit-quartz- 
Character of the strat, 188 with bands of pebble beds, and some con- 
OF ne slomerates. The sandstones are generally coarse, 
with often a clayey constitution : occasionally felspathic, or ferruginous ; 
and usually of dark shades of red, grey, and brown colors. They are, as 
a rule, thin-bedded. Pebble beds are rather more characteristic of this 
group than of any of the other quartzite series, the pebbles being small, 
and often extremely numerous, of quartzite and various colored cherts, 
jaspers, and hardened shales, evidently debris derived from the cherty 
and shaly series with bands of felspathie and trappean rocks, on which 
the group is mainly resting. The diamonds occur in some of these more 
pebbly and clayey layers or bands: and pebble beds may be very often 
seen in the unworked areas which are exactly like those whence the 
diamonds are obtained. There are occasionally sandy shales intercalated 
with the quartzites, but these are never well marked or of any extent. 
In the northern part of the country beds of the Banaganpilly group 
are overlapped by the Nerjee limestones ; most particularly and clearly 
in the eastern part of the Gooraman Conda valley on the north-west flank 
of the Oondootla plateau. Here the blue beds, or coralloid limestones 
rest immediately on the shales and traps of the KADAPAH rocks ; but 
in travelling along the edge of the north-west scarp of the plateau it is 
| ۰ ) رت‎ 
