93 KING: KADAPAH AND KARNÜL FORMATIONS. [PART ۰ 
jasper (red and brown) and chert (grey of all shades), and a few of granite. The upper 
beds are progressively less and less coarse. The greatest thickness of the beds in the 
depression is about 50 feet, the bedding regular, distinct, and very nearly horizontal. 
The upper beds which overlap and cover those in the hollow are not more than four or 
five feet thick. The prevailing color of the rock is pale reddish or purplish brown." . 
“To the north of the Yemkulloo ridge is a belt of granitic rock, a mile or a mile 
and a half in width denuded of its former capping of pebble beds and greatly eroded be- 
cause of its coarse texture and friable nature. The granite is in most places highly 
felspathic and of pale pink color." 
“On the north side of this granitic tract lies a low ridge showing, along most of 
its southern front, a small scarp rarely more than three or four feet high and often less 
than that. This scarp is the edge of a thin capping of pebble beds which once were con- 
tinuous with those on the Yemkulloo Trig. station hill Following it towards the 
west for about three miles it sinks a little, anda thin bed of brown pebbly conglo- 
merate dips to the south-west by south, and passes under the Jummulmudgoo limestone 
lying north of Jutpoal, showing that it is stratigraphically a representative of the 
Banaganpilly quartzites. The lowest pebble bed exposed resting on coarse quartzo- 
felspathie granite to the north and north-east of Jutpoal consists almost entirely of grani- 
tic debris cemented by a silicious matrix, and is sometimes, when weathered, not very 
easily distinguishable from the underlying granite: it forms a low anticlmal ridge. 
Quartz pebbles are extremely numerous in the bottom pebble beds. The color of the 
quartzite matrix of the pebble beds is very variable, ranging from dirty white to 
greenish grey and reddish brown. North of Munchuleotta (Munchutialty of map) 
the pebble beds have passed up gradually but in a very small thickness of beds (2' to 
3' or 4’) into quartzite of pinkish brownish and purplish color, and here the scarp is 
higher than further west owing to the greater number of remaining beds.” 
“ Northward of the anticlinal ridge at Jutpoal the pebbly quartzites re-appear on 
the north bank of the Penthully nullah, but in most places only as a thin skin over the 
granitic rocks varying from six inches to two or three feet in thickness. This thin layer 
of quartzite pebble beds is very ragged along the edge of the high ground skirting the 
bank ofthe nullah. Here and there where the planing action of the denuding agency 
(probably marine currents) has been less perfect, low hummocks of the brownish or 
purplish quartzite remain, showing the gradual passage upward from the pebbly con- 
glomerate into compact quartzite.” 
“ To the east of Penthully the pebbly quartzites are seen to rise up the southern slope 
of a narrow ridge about one hundred and fifty feet above the general plain, and are eut 
off suddenly on the north side by a low scarp three to five feet high, which constitutes 
the northern boundary of this part of the area occupied by the diamond-bearing series. 
To the north of this Penthully hill commences the great granite region north of the 
Kistnah.” 
“ The outlier of Jammulmudgoo limestones resting on the quartzites south-west 
of Penthully has been already described.” 
( 92 ) 
