CAMBRIAN AND PERMO-CARBONIFEROUS GLACIATION. 205 



out by the intersection of faults, but they widen in their outcrops 

 as they extend towards the southern end, and at the extreme end 

 of the ridge, which is abruptly truncated, they are cut off by a 

 transverse fault accompanied by much breccia. The beds are over- 

 lain by Taple'y's Hill slates, Brighton limestones and purple slates 

 and quartzites, in their natural order, forming the ranges between 

 Mount Remarkable and the coast. 



The glacial beds reappear on the south side of Mount Remark- 

 able and cross the main road a little east of the Gorge Hotel. 



On the ranges west of Mount Remarkable, severe faulting, in 

 places, has brought the glacial beds once more to the surface. Very 

 fine exposures of the till with large erratics occur in Waterfall Creek, 

 a tributary of Baroota Creek. The beds are of great thickness and 

 form a series of steps in the bed of the creek, which has a rapid 

 descent, with some fine waterfalls from which the creek takes its 

 name. 



Scores of outcrops of the Cambrian till have been noted, 

 covering thousands of square miles, but for the most part they 

 possess features in common, and do not call for specific descriptions. 

 Striated erratics have been obtained from all outcrops of the beds 

 where attention has been given to their collection. My colleague. 

 Dr. Douglas Ma wson, has recently discovered undoubted evidences 

 of the Cambrian till in the western parts of New South Wales, and 

 will publish his results shortly. 



2. Permo-CarhoniferousGlaciation. — Since this Committee pre- 

 sented its last report an entirely new and extensive area of Permo- 

 Corboniferous glaciation has been discovered and, in part, described.^ 

 It includes the plateau country lying to the east and north-east of the 

 Hindmarsh Valley, bounded by the Willunga Ranges, Bull's Creek 

 Range, and the Strathalbyn Range, on the north; Currency Creek 

 on the south, and the River Murray Plains on the east. It is an 

 area that may be roughly estimated to comprise 240 square miles, 

 and is continuous with the still more extensive glacial area on its 

 western side, including the Hindmarsh and Inman valleys, the Cape 

 Jervis Peninsula, from Myponga on Gulf St. Vincent, round the 

 Cape to Port Elliot, on the southern coast, over which glacial deposits 

 of Permo-Carboniferous age have already been determined and 

 described. 



The new area for these deposits is so uniform in physical 

 features, as well as distinctive in character, that it may be regarded 

 as a physiographical province. The higher portions of the plateau 

 are about 1,000 feet above sea level, with a gradual slope to the east. 

 Pre-Cambrian inliers, with rounded contours, rise above an undu- 

 lating sandy country covered with a dwarf, desert-like scrub. The 

 drainage, which is insignificant, finds its outlet mainly along flat- 

 bottomed valleys occupied by swamps. 



1 " Description of a New and Extensive Area of Permo-Carboniferous Glacial Deposits in South 

 Australia," by W. Howchin. Trans, and Proc. Roy. Soc, S.A., vol. XXXIV., 1910, p.231. 



