226 KING: KADAPAH AND KARNÜL FORMATIONS. [PART 14 
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covering of the flat country. The sub-group may very possibly be 
represented in the Raigoomanpully ridge further west; but there is no 
recognizing it there more particularly than in any other of the numerous 
outcrops of quartzites in this part of the field. At all events, whether 
the Byrencondas are represented by the quartzites of Raigoomanpully 
or not, they most probably have died out to the westward, for this 
is the case with all the other bands of quartzites which run into 
the valley in this direction, except those of the great Eeshwarnacoopum 
nucleus. 
In this north-east part of the field, viz., in the country north of 
i Dorenall, Doopad, &e., whieh is mainly a slate re- 
Apparent break in the ۱ : : 
north-easterly extension gion, the different bands of quartzites in the slates 
of strata. 
are most confusing in their outcrop, for they have 
generally, supposing they are continuous with those of the Cumbum 
valley, become reversed in their dip and twisted in their course. It 
seems as though Mr. Foote's abrupt west-north-west  east-south-east 
Donaconda fault, on the eastern edge of the area, were continued in the 
same direction past Doopad, and that this, in conjunction with other lines 
of dislocation running along the Dorenall valley into the lofty and 
 quartzite-scarped Innaparatyconda, might account in part for the evident 
breaks in the bands of strata in this part of the country. 
In the Gundycotta or Jummulmudgoo range of hills, the slaty 
Style of Gundycotta Shales, &c., of the Penn-air are overlaid unconform- 
PUT ise ably by a series of massive quartzites. The upper- 
most beds here of the Chey-airs are red, earthy, and occasionally sandy 
slaty shales with intercalated thin bands of quartzites; and these in 
following the course of the river through the Gundycotta gorge appear to 
be perfectly conformable with the great thickness of quartzites with a few 
thin bands of sandy shales which is seen in the great cliffs of the eastern 
part of the gorge. The dip is only about 5° or occasionally 10° to 
the north-eastward. However, when the south-west scarp of this range 
(226.1) 
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