m 



Forest of Kuitpo, to the existence of two large boulders of granite in the forest 

 area. These occur in Section 3419, Hundred of Kuitpo, approximately on the 

 line of the cross-section between Wickham's Hill and Prospect Hill, and seven 

 miles north-east of Dingabledinga. 



As found, these granite boulders were about 2 feet and 2 feet 6 inches 

 diameter respectively, and were not glaciated. In company with other smaller 

 pebbles they had weathered out of a somewhat sandy surface formation. The 

 locality is elevated a little above the floor of the valley on a low rise of soft 

 sandy beds. The boulders are separated by a distance of about a quarter of a 

 mile. They are both red in colour, due to the abundant development of red 

 orthoclase felspar. In no essential feature do they differ, though one contains 

 more biotite than the other. Other minerals present are quartz and a very little 

 plagioclase. Strain features are noticeable in the microscope slide. The rocks 

 have every appearance of being a slight modification of the typical red granite 

 of the Murray River Valley. They are obviously erratics. 



There are several areas in the Meadows Valley of a very sandy nature, 

 notably Sections 216, 211, 209, 207, 206, and 205, which are all in a line leading 

 to Peter's Creek. Samples of these surface sandy formations, when examined 

 microscopically, were found to be constituted of water-worn grains. However, in 

 the case of a very fine-grained argillaceous sandy bed entered in sinking a well on 

 Sec. 3454, the particles were seen to be angular splinters, which is characteristic of 

 glacial sands and muds. In the vicinity of Knott's Hill, at the head of Peter's Creek, 

 the sandy formation is especially well developed and quite 50 feet in thickness in 

 some places. Here waterworn boulders are so mixed up with it as to constitute a 

 boulder wash in part, recalling the auriferous formation mapped as Tertiary at 

 Mylor and other areas in the more northerly sections of the Mount Lofty Ranges. 

 At this spot the Willunga Range scarp has been notched to a depth of about 

 200 feet below the general level of the old peneplain to which reference has 

 been made. This is the only real break in the range between the Onkaparinga 

 cut in the north and the seaward termination of the range to the south. Dash- 

 wood's Gully is a considerable scallop in the range caused by the headward 

 erosion of its own creek, but at its head the level is still practically that of the 

 old peneplain. 



At Peter's Creek, however, the Meadows Valley may be entered at an eleva- 

 tion of little over 1,100 feet above sea level. By continuing down the Meadows 

 Creek to the Plnnis River, the Mount Lofty Range can then be crossed without 

 rising to any greater height. This is the lowest passage available across the range, 

 and is the natural route for trunk-line railway communication from one side to 

 the other. This notch in the old peneplain, now occupied and in process of 

 deepening by Peter's Creek, is inherited from an earlier system of drainage 

 whereby the intermontane waters escaped to the west. The present creek is now 

 continuing the work of an earlier cycle. Now that the glacio-fluvial character 

 ot the old filling of the Meadow? Valley appears well founded, it suggests itself 

 that the notch at Peter's Creek may also be a remnant of old glacial topography. 

 It is to be noted that the ice heading from Mount Compass in that direction 

 would be leading towards Hallett's Cove, where is preserved the most northerly 

 evidence of the Permo-Carboniferous glaciation yet known in southern South 

 Australia. 



Geological Cross-section. 



In a traverse across the Meadows Valley from the crest of the Willunga 

 Range, at a point about a mile south of McLeod's Hill, sandy and slaty beds, 

 presumably lower members of the Adelaide Series, are met with on the western 

 slopes of the valley. At the bottom of the slope in the neighbourhood of 



