47 



the same geological conditions continue from the one exposure to 

 the other along the Mount McTaggart Range, and for several 

 miles farther north to the mount of that name. West of the 

 mount, along the bridle-track to the Reward Gold Claim, exten- 

 sive exposures are seen. It is also probable that the mount itself, 

 and the range that extends farther north, had a similar origin. 

 The same formation quite likely extends to the Arkaroola Creek, 

 and even beyond that. I saw a conglomerate-quartzite west of 

 the Mount Fitton South Mine. It is not within my personal 

 knowledge that beds identical in character do extend away to the 

 south from those exposures I have mentioned, but from what I 

 saw and heard I suspect that the same will be found to exist at 

 intervals right through to Mr. Howchin's "farthest North" 

 point. 



The Flinders Ranges have been so often described that a repe- 

 tition is not necessary here, but I may say that the "till" band or 

 bands herein noticed form a part of the primary rock formations 

 in that range, and were subjected at a distant geological date — 

 earlier than the Cretaceous period — -to tremendous earth move- 

 ments. In the instances under notice the effects of disturbance 

 are everywhere apparent, and it is more than probable — seeing 

 on how vast a scale the rocks have been thrown about, and also 

 how dependent such formations are on the contour of the country 

 during their formation — that the recognisable outcrops will by 

 no means follow a straio:ht course, nor be continuous throuo-hout. 

 The Worturpa exposures, however, to my mind, practically 

 extend the known area over which glacial action obtained in 

 Cambrian times to more than double the longitudinal distance 

 shown by Mr. Howchin, and to have occupied — in general terms 

 — the entire length of the Mount Lofty and Flinders Ranges. 

 The elevated area of land on which the incap rested, and from 

 which the material was derived to build up the till at Worturpa 

 — judging from the dip of the strata over a considerable area — 

 lay to the North, West, and South-West ; but this must only be 

 regarded as a suggestion. 



That such an interesting and prominent, and I may say his- 

 torically important, feature should have remained so long undis- 

 covered, shows how little is really known, and how necessary a 

 detailed examination and geological mapping of the State has 

 become. 



