65 



high. Large single erratics, as well as groups up to 30 in number, 

 can be seen on the hillsides, and where a wash has occurred the 

 glaciated stones can be picked up in great numbers. Amongst 

 these, rounded quartz pebbles are conspicuous and in nearly every 

 case show polished faces. Amongst the larger erratics granite 

 boulders are the most common, and are associated with a few 

 quartzites, one of which measured 7 ft. 6 in. by 3 ft. 9 in., 

 exposed above the Till, in which it is partially buried. On the 

 hillsides above the lighthouse (where these large boulders have 

 been weathered out) the sloping ground is well grassed, which 

 obscures much of the glacial features ; but the Till bed follows 

 the northern trend of the coast line, exhibiting a steep and bare 

 cliff face of the most instructive character. It is here seen that 

 the bed is a true unstratified Till crowded with travelled stones, 

 mostly ice-marked. A complete section is visible of a great Till 

 bed of over 100 feet in thickness, resting unconformably on a 

 floor of paleozoic rocks, and capped by variegated (? Miocene) 

 clays and a superficial travertine crust. The bed-rock is soft and 

 much decomposed, and therefore unsuitable for receiving or re- 

 taining a glacial face. The glacial outcrop was tra3ed along the 

 line of cliffs for about three-quarters of a mile without reaching 

 its termination. 



Observations made from the top of the coach, on the return 

 journey from Yankalilla to Adelaide, it seems highly prob- 

 able that the glacial sandstone extends for about ten miles 

 from Yankalilla in that direction, as evidenced by (a) the road 

 metal ; (6) on top- of hill above Wattle Flat (44 miles from Ade- 

 laide) the yellow sandstone characteristic of the glacial beds of 

 the locality outcrops by the roadside ; (c) on hill north side of 

 Wattle Flat Post Office what appears to be a Till with stones is 

 exposed in road-cutting; (d) and at 41 \ miles from Adelaide 

 this (?) glacial sandstone is once more seen in outcrop by the 

 roadside. 



These observations require to be confirmed by a closer examina- 

 tion of the country, but it seems probable that the glaciation had 

 its Northern limits determined by the lofty Sellick's Hill Range. 



General Deductions. 



1. The stratigraphical features of the glacial beds of the dis- 

 trict have been but imperfectly traced, but they appear to be 

 devisable into two well-marked lithological types — 



(a) An unstratified Till, of a dark color, more or less arenaceous, 

 either with or without glaciated stones. 



(b) Yellow and grey sandstones and conglomerates varying 

 from a soft, friable sand-rock to a hard, siliceous sandstone, which, 

 in the latter case, is extensively jointed. These sandstones are 



