CHAP. 4.) KADAPAH FORMATION.—NULLAMULLAY BEDS. 223 
east; while a few miles further north, the beds show a dip of 80° west. Near the 
north end of Konapully ghat anticlinal, the dip of the west side of the arch is 75° 
west, and diminishes greatly to the elliptical extremity of the anticlinal. 
“The inversion of the Davur Conda ridge is not so great as that of Goralabode ; 
the former not exceeding a dip of 70° or 75° east. 
“The section shows the configuration and structure of the Porenaumla valley, a 
little north of the great tank ; of the Yellaconda ridge, between the Goralabode and the 
Sheetarampoor pass ; and of the outlying quartzite mountain Byrawoody Conda. 
“ In lithological character there is no difference between the quartzite beds extending 
from the Mylecherla peak southwards to the Sheetarampoor ghat. Both at the pass 
across the Mylecherla peak and the Sheetarampoor ghat one crosses over a great series 
of quartzites, chiefly of the pure hard semi-vitreous variety. A few large quartz veins, 
with north-south course, occur traversing the quartzites.* The prevalent colors of the 
quartzites are greyish white, bluish grey and drab; rippled surfaces are less frequently 
seen hereabouts than further north. 
“The northern part of the Yellacondas shows a continuation of the same beds 
as form the Gauly Conda and Pogulla plateau under similar circumstances of 
position and configuration, the quartzite beds being generally of pure typical 
semi-vitreous varieties. About three miles to the north of Gauly Conda, the anticlinal 
structure of the mountain-ridge is very obvious, although complicated by several minor 
undulations of the beds. The westerly dip of the beds, which at Pogulla is easy and 
gradual, has become very high at Chennoopully ; and still further north at the Nerdy 
Cunnama and Junna Cunnama appears to have been inverted, the dip of the beds 
having changed to the east. Both the latter sections are obscure and not to be 
reconciled with the Chennoopully section but by assuming an inversion ; no faults being 
traceable by which such an immense succession of quartzite beds, with easterly dips, 
could be otherwise explained. 
“In the section near Chennoopully a splendid traverse of the Byrenconda 
series is shown in two deep ravines on the west flanks of the Yellaconda ridge. The 
head of either ravine is formed by splendid cliffs several hundred feet high, of drab 
and whitish, waxy quartzite, stained in most parts by decomposition of ferruginous 
particles of a bright red colour. The faces of the cliffs are formed by vertical north- 
east-south-west joints, the axis of the anticlinal striking north by east. The section 
of the beds by the north-east joints forming the faces of the cliffs lies just eastward 
of the first curve of the beds west of the main anticlinal axis, so that the curve is fairly 
seen from points occupying the same level; from below, the section is a very 
puzzling one. 
* Indications of broken strata.—W. K. 
