ground (plate xii.), several of which have diameters of 7 

 .and 8 ft. One granite boulder occupies a perched position 

 on the edge of the main gully facing east, which gives it a 

 striking appearance when viewed from the beach (plates xiii. 

 and xiv.). This erratic has been much larger than it is at 

 present, having exfoliated and thrown off an outer shell which 

 is about 4 in. in thickness. In its reduced form it has the 

 shape of a nearly round boulder 8 ft. in diameter. The 

 boulder rests on undisturbed till. 



In a small tributar}' of the main gully just mentioned 

 .a very stony face of glacial till is exposed, including some 

 fairly large erratics. A group of still larger erratics stands 

 out conspicuously near the upper part of the moraines facing 

 the sea (plate xiv.). A small washout on the south side 

 near the summit of the moraine contains a very interesting 

 group of boulders, some of which show evidences of glacia- 

 tion (plate xvi.). 



The majority of the large erratics belong to the local 

 type of granite — a very coarse, pinkish-coloured granite, with 

 numerous large porphyritic crystals of felspar, many of which 

 nave undergone corrosion, and take the appearance of pseudo- 

 pebbles. These granites also sometimes show inclusions of 

 the local schistose rocks, fragments of the latter having been 

 caught up into the magma before its consolidation. The other 

 classes of erratics, mentioned in the order of the frequency 

 of their occurrence, are fine-grained, highly-coloured pink 

 granites, and fine-grained grey granites. Quartzites of 

 several types also occur. Some of these are white, laminated, 

 and of saccharoidal texture. One specimen of this class 

 measures 4 ft. in 'length. Other examjoles of quartzite are 

 bluish in colour and very siliceous. Among the smaller 

 erratics were noticed aplites, quartz-porphyry, and a few 

 examples of the local schists. Small drifts of blown sea-sand 

 occur in places on the sides and also on the summit of the 

 ridge. 



A conspicuous feature of the morainic material here, as 

 well as in other parts of South Australia where Permo- 

 Carboniferous glacial deposits occur, is the presence of highly 

 water-worn gravel, apparently beach-worn. The commonest 

 varieties represented among these rounded stones are quart- 

 zite, quartz, granite, and a few schistose pebbles. Many of 

 these show some form of glaciation, as, for example, a high 

 polish, or have been strongly ground on one side ("soled"), 

 and in a few instances exhibit well-marked glacial striae (plate 

 xvii.). I do not intend to discuss the origin of these sea- 

 worn pebbles of the glacial drifts in the present paper — that 

 -will come more appropriately at a later stage, when I hope 



