83 
hard, compact, fine-grained quartzite, merging in parts to 
a more friable sandstone and grit, portions being ferruginous. 
A prominent parting of the rock coincides with the original 
planes of bedding, while further two joints, not very persis- 
tent, occur: one in direction N. 20° E., dipping 65° easterly, 
and another at right angles to this. Planes of shear are 
highly polished by slickensiding, and in parts the rock has 
been severely fractured. Drift bedding is much in evidence, 
and makes the determination of strike somewhat difficult at 
the eastern limit of the outcrop. The rock has a tendency to 
cavernous weathering, one of the largest caves having been 
occupied as a store by the Government surveyors. 
The quartzite overlies unconformably schists and clay 
slates, the planes of schistosity and cleavage of which stand 
at a high angle. The direct junction is for the most part 
hidden by the "waste" of rock that has accumulated at the 
foot of the escarpment, but in a small watercourse on the 
east the direct contact can be observed for a limited distance, 
the quartzite resting upon decomposed clay slate. 
Although the underlying pre-Cambrian beds are exten- 
sively intruded by diorite, pegmatite, and other dykes, no 
such intrusion was observed to penetrate the overlying quart- 
zite."^ The same is true with regard to large quartz reefs 
occurring in the immediate neighbourhood. From Mount 
Chandler the quartzite extends eastward as low, disconnected 
ridges, and was subsequently found at Camp 7 (Krupp Hill) 
overlying pre-Cambrian schists, but not overlain by desert 
sandstone, which, however, directly overlies low outcrops of 
pre-Cambrian rocks in the vicinity. This fact would in- 
dicate a fair altitude of the quartzite during late Cretaceous 
times. 
At Ewintinna soakage outcrops of the same formation 
take a northerly curve, the beds locally striking N. 25" E. 
The rock at this spot is, similarly, a quartzite, slightly band- 
ed and sub-fissile, and in parts traversed by numerous wavy 
veinlets of secondary quartz. The rock is parted by a promi- 
nent strike- joint, dipping about 75° westerly, and another 
plane dipping 85° in the direction N. 25° W. A few miles 
south of this soakage the quartzite was found to have its 
strike identical with that of the Mount Chandler outcrop. 
Mount Conner.— This monolith, rising to a height of 
2,600 feet above sea level, and about 800 feet above the level 
* Compare the statement: — '*. , . the granite and other 
dykes and quartz reefs do not extend int-o these rocks." H. Y. 
L. Brown. Report of Geological Examination of Country in 
Neighbourhood of Alice Springs (by Authority: Adelaide, 1890). 
