90 PROCEEDINGS OF THE ROYAL SOCIETY OF QUEENSLAND. 
Evidence collected on the Lawn Hill field (N.Q.) indicated that 
a granite intrusion at a depth, and not showing on the surface, had 
uplifted the area forming a number of domes. The lower or Lawn Hill 
Series, which may well on existing evidence be regarded as Lower 
Cambrian, was greatly affected by the intrusion, and the upper, Con- 
stance Range Series only slightly, as though by expansion through 
crystallisation of the intrusive rock below. The Lawn Hill Series is 
traversed by quartz reefs many of which contain rich lead deposits. 
The break in the Cambrian during which volcanic and intrusive 
action took place corresponds well to the break in the Templeton Series 
in the Cloncurry district. 
On present evidence the Nullagine is a geological scrapheap which 
will have to be cut out or reduced. Much of it will as investigation 
proceeds be found to be Lower Cambrian. The Adelaide Series, the 
lower part of which David placed as equivalent to the Nullagine, is 
undoubtedly Proterozoic and pre- Cambrian. The great glacial period 
was late Proterozoic and anteceded Archaeocyathinae. 
Evidence of glacial action of Pre-Cambrian age occurred as far 
north as Borroloola. Cores from bores put down in 1912, and outcrops 
of intercalated fine sandstone and shale in the Macarthur River gorge, 
showed periglacial involutions similar to those described from North 
Eastern Illinois by Robert P. Sharpe in J. Geol. 1, No. 2, Feb-March, 
1942. The beds in which these periglacial involutions occur are 
moderately folded and underlie the more gently dipping Cambrian rocks 
of the Barkly Tableland unconformably. 
Along the Northern Road Telegraph Line from Alice Springs 
rocks of the Arunta Complex only are seen in outcrop for the first 70 
miles. A small range, called the Hann Range, through which the road 
runs before reaching Aileron, and its westerly continuation, the Reap- 
hook Hills, consist of red quartzites dipping north at 20°, with some 
reddish shingly or slaty rock intercalated. 
These rocks are heavily faulted. They appear to belong to the 
Adelaide Series. A few miles further north at Aileron rocks of the 
Arunta Complex again appear. Beyond Aileron there are more low 
gently dipping sandstone ranges, the Reynolds Range, and these too 
probably belong to the Adelaide Series. North of these towards Teatree, 
which is about 110 miles from Alice Springs, extensive areas are capped 
with volcanic rocks — andesite, trachyte and tuffs of these. At Teatree 
these rocks have been intruded by a laccolite of blue granite. Silver 
ore is said to occur in kaolinised tuff in hills north-east of Teatree. North- 
west of Teatree there is a group of high rounded treeless hills and some 
spurs with cliff escarpments forming the Central Mt. Stuart group. These 
hills have a remarkable physiographic resemblance to Lawn Hills and 
have a similar dissected dome structure, and in the valley between the 
peripheral hills there outcrops a laccolitic mass of porphyritic felspar 
granite. This granite is in character very like that on the Queensland 
border north of the Nicholson River. Some of the Central Mt. Stuart 
