62 



colored quartzite, very favorable for recording the effects of 

 ice-action. This exposure must take rank as the finest example 

 of a glacially-polished rock known within the limits of Aus- 

 tralia. Most likely it is the identical example discovered by 

 Selwyn 38 years ago, and may appropriately be called " Selwyn's 

 Rock." A few yards higher up the stream, in a wash-away on 

 its Southern bank, another polished surface of smaller extent is 

 seen. The striae are in the same direction as on the larger face, 

 and cross the bed of the stream diagonally. The only other 

 places where striated rock was noticed was in a tributary of the 

 Bungala River, near its source on the Western side of the Bald 

 Hills, about four miles from Yankalilla, where two small patches, 

 a foot or two square, with overlying drift, were seen. Here also 

 the glaciated rock is a highly siliceous quartzite, similar to the 

 large polished surface in the Inman, and the stria? show the same 

 general direction. 



On the rising ground above the glaciated floor (already 

 described), near the seventh mile-stone, there are immense blocks 

 and groupings of granite boulders scattered over the sides of the 

 hill. Some of these are so massive that at first sight they look 

 like rocks in situ. Close by, a mountain torrent has cut its way 

 through a bed of drift, studded with glaciated stones at an alti- 

 tude of about 100 ft. above the glacial floor in the bed of the 

 river. 



From this point, for several miles up stream, the glacial drift 

 is seen at intervals in the banks of the river. Its general feature 

 is a soft sand rock carrying glaciated stones, and in places is 

 seen to rest on a dark-colored arenaceous clay with few stones. 

 In some instances the sand rock is considerably indurated and 

 carries beds of conglomerate irregularly distributed. Several 

 readings of these drift beds gave a dip of about 7° to E.S.E. 



Between the ninth and tenth mileposts large granite boulders 

 a,re extremely common in the Inman, in some places almost 

 choking the bed of the river. One hundred large examples were 

 counted in the distance of a hundred yards. Blocks of granite 

 were measured equalling ten, eleven, and twelve feet in their 

 longer diameters. 



In the upper reaches of the Inman the erratics are fewer in 

 number, and the glacial drift occurs as a soft, bluish-black clay, 

 which is more or less sandy in composition. 



About 15 miles from Port Victor the Bald Hills watershed 

 crosses the valley transversely, cutting off the eastern (i.e., the 

 Inman and Back Valley) drainage, which finds its outlet at Port 

 Victor; from the western (i.e., the Bungala and Yankalilla River 

 systems), which flow into Gulf St. Vincent. The road crosses the 

 watershed at a height of 640 ft. above sea level. The ice has 



