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PROCEEDINGS OF THE ROYAL SOCIETY OF QUEENSLAND. 
Macdonnell Ranges, and divided and named the formations from oldest 
to the Ordovician as follows : — 
1. Arnnta Complex, very old gneisses, etc. 
2. Perta-knurra, schists and quartzites with limestone. 
3. Pertatataka, quartzites and limestones. 
4. Pertaoorta, Cambrian quartzites and limestones. 
5. Larapintine, Ordovician quartzites, shales and marl. 
The names seem an abomination (and David (1932) spells Perta- as 
Pata-), but nevertheless the divisions made by Dr. Madigan are useful 
and safe. Correlation of these formations with others in remote parts 
of Australia depends on extended investigations in intermediate areas. 
The writer has had occasion to investigate the Lawn Hill and 
Territory border area in Queensland, the Woologorang and Borroloola 
area on the Territory side, and fairly extensive stretches north of the 
Plenty River and also between Anningie and Barrow Creek in Central 
Australia, besides having made extensive geological surveys between the 
Gulf of Carpentaria and Port Darwin. 
Some tentative correlations will therefore be ventured, in this 
paper, although they should be regarded mainly as a basis for future 
investigation. 
II. THE CENTRAL AUSTRALIAN MASSIF. 
The Macdonnell and Hart’s Ranges taken together constitute a 
massif of gneissic rocks, both of igneous and sedimentary origin. 
Together they form an anticlinorium built up in an archaean geosyncline. 
In general the strata in the Hart’s and contiguous Strangway Ranges 
dip to the north, and those in the Macdonnell Range, which lies south 
of the former, dip to the south. Minor rolls occur on these two general 
dips but it is safe to say that the limbs of the anticlinorium have an 
average dip north and south respectively of about 30°, and it was on 
that evidence that the late Sir T. ,W. E. David postulated a mountain 
range upwards to 50,000 feet high in Central Australia in pre-Cambrian 
times. The pre-Cambrian uplift was oval. The average strike in the 
Hart’s and Strangway Ranges is not quite east- west but rather 
W.N.W.-E.S.E. However towards the western end of the Hart’s Range 
the dips tend to become north-westerly, and towards the eastern end 
north-easterly. 
The Macdonnell Ranges strike more nearly east-west in the 
portions closely examined by Madigan. That investigator {op. cit.) has 
given such an excellent and detailed account of the Macdonnell Ranges; 
that nothing further need be said here about them. 
