270 REPORTS OF COMMITTEES. 



Along the same hill face, rising towards the head of the creek, 

 numerous very large boulders are seen. One granite mass, with meta- 

 morphic rock inclusions (similar to what occurs in the granite of Granite 

 Island), measures 8ft. by 6Jft. by 7ft. high ; another, 8ft., in a group 

 of eight, which almost equal this one in size. A sand ridge, produced 

 by the breaking down of the glacial sandstones of the creek, is marked 

 with several very large stones ; one of these, 10ft. in length, is almost 

 sunk in the sand ; another, 16ft. by 10ft., has undergone much exfolia- 

 tion, 'and is nearly covered by drift. 



EiDGE ON West Side op Duck's Nest Creek and Deep 

 Creek Valley. 



The Deep Creek (or Fresh- water Creek) lies to the north-west of the 

 Duck's Nest Creek, and is the channel of drainage for a large area, 

 giving a perennial supply of fresh water. The valley has been largely 

 choked with glacial drift, which has been subsequently removed, and 

 now presents the features of extensive sandy flats, richly timbered, 

 with occasional boggy places. More interest attaches to the ridge 

 which separates this valley from the Inman Valley than to the Deep 

 Creek Valley itself. 



Near the eighth mile-post from Victor Harbor, a bridge crosses 

 the Inman, and the road, going north, takes the rise with the Duck's 

 Nest Creek on the right hand. Glacial sands and clays are seen on the 

 hill side, and on the top of the ridge, to the left hand, a small rounded 

 hill of broken quartzite suggests a disintegrating roche-moutonnee. 

 There are one or two other less prominent rounded spurs to the right 

 hand, on the sides of the gully, but these are also much broken. 



Whilst some of the ice-sheet passed over the saddle of the Strang- 

 ways Hill spur, it is evident that the main flow passed up the Inman 

 Valley and, rounding Inman Hill, formed a rather sharp curve in the 

 direction of the Deep Creek Valley. The ice left an enormous number 

 of large erratics on the convex side of this curve — the greatest field of 

 erratics that I know in any part of South Australia, and included the 

 largest examples of these travelled stones. By far the greater number 

 are granites, and mostly the large-grained, Granite Island type, of 

 which there are many hundreds. 



Three of these lie beside the road, near the top of the ridge, and 

 measure respectively — No. 1, partially buried, 17ft. by 5|ft. ; No. 2 

 almost round, 16Jft. ; No. 3, 15ft. by 12ft. A quartzite, in scrub, not 

 far from road, is well polished and striated. 



In the scrub, on west side of road, can be seen many similar ones. 

 A group of 16 large erratics are crowded together ; the largest of the 

 group measures 16ft. by 15ft. by 8ft. high, and must have been much 

 larger, as it is surrounded by large pieces which have exfoliated from 

 the mass. Another, more on the slope towards the valley (Section 48), 

 is 9ft. by 8ft. by 9ft. high. Another, deeply sunk in morainic matter, 

 has an exposed surface of 9ft. by 8ft., with Hit. out of the ground. 

 The largest erratic I have seen in the Inman VaUey is on this slope, 



