18 T. W. E. DAVID. 



Mine he gives as from about 60° to 70° easterly. The lower 

 Cambrian rocks when traced northwards from Mount Lofty 

 and eastwards into the Barrier Range district of New 

 South Wales show, near Poolamacca a strike of N. 10° W. 

 (magnetic) to N. 20° W., has been observed by me at 

 Campbell's Creek in that vicinity, the dip being easterly at 

 about 70°. At Torrowangie the lower Cambrian limestone 

 (probable equivalent of the Brighton limestone near Adel- 

 aide) dips E. 15° N. at about 13° up to 20°. At Paps Creek 

 about 32 miles northerly from Broken Hill, near the locality 

 of Campbell's Creek above referred to, Dr. Mawson has 

 observed an unconformable junction between the lower 

 Cambrian system and a group of schists (talc and mica 

 schists) immediately to their west. There can be little 

 doubt that these schists are Pre-Cambrian. 



The authors of the geology of the Broken Hill lode 1 point 

 out that there is a divergence of strike between that of 

 the schists and that of the Cambrian strata at Paps Creek 

 of from 25° to 33°. These talc or mica schists although 

 Pre-Cambrian may not be Archaean. Now at Broken Hill, 

 only 32 miles to the south, the true Archaean gneiss and 

 amphibolite schists strike about E. 40° N., and have been 

 strongly overfolded as well as overthrust in a south easterly 

 direction. There is thus a wide divergence between the 

 trend of the folia of these Archaean rocks of Broken Hill 

 and the strike of the lower Cambrian glacial beds and lime- 

 stones near Campbell's Creek and Torrowangie, the diver- 

 gence amounting in this case to about 60°. But there is 

 also a divergence between the trend of the Broken Hill 

 Archaeans and that of the Paps Creek schists. Possibly 

 the latter may be Algonkian, for which age in the Mount 

 Lofty region Dr. Woolnough has proposed the term Barossian. 



1 Australasian Inst. Mining: Engineers, Vol. vi, No. 11, April 1910, by- 

 Messrs. R. J. Donaldson, C. W. Matters, R. T. Slee, J. C. Coldham, H. H. 

 Walman, F. Voss Smith, and H. W. Davies. 



