15 



2. In northern Yorke Peninsula: — On the western side, 

 cliffs at Wallaroo Bay, also at Tickera Bay, and extending 

 inland to Boor's Plains. On the eastern side there is a small 

 capping resting on older rocks at Ardrossan, and outcrops 

 occur, mostly in cultivated fields, around Kulpara. 



3. Small occurrences on Kangaroo Island: — Along the 

 shore at Queenscliffe ; resting on granite at Cape Willoughby ; 

 and a small outlier, inland from Smith Bay, on the north 

 coast. 



4. On the eastern side of Gulf St. Vincent: — A high- 

 level patch on the Hindmarsh Tiers ; and another, at much 

 lower level, at the railway bridge over the Finniss, on the 

 eastern side of the ranges ; a narrow fringe on the coast of 

 Gulf St. Vincent, near Sellick's Hill ; on ploughed land on 

 Mr. Oliver's farm near Bellevue ; along the sea cliffs at Port 

 Willunga, and at Port Noarlunga; the beds have been 

 proved in several well-sinkings, near Paradise, in the Torrens 

 valley, as well as in the Kent Town bore ; at a high level 

 above Gawler ; and in the deep bore at Croydon on the Ade- 

 laide Plains. 



The small outcrop which forms the subject of the pre- 

 sent paper was discovered in an unexpected situation, in 

 the middle of the Adelaide Plains, where there is usually a 

 great thickness of alluvium of recent age. It is also inter- 

 esting from the fact that it is the most northerly exposure 

 of these beds, at present known, on the eastern side of Gulf 

 St. Vincent. 



The River Light is a juvenile river that pursues an 

 erratic course, first, as a longitudinal stream taking its rise 

 near Waterloo, and flowing north and south ; it subse- 

 quently takes an easterly direction but, instead of finding its 

 way to the Murray flats, it suddenly turns and takes a wes- 

 terly course, cutting through the low ranges, transversely, and 

 loses itself on the plains. In its upper portions the river 

 flows over an old Cambrian peneplain, consisting mainly of 

 rotten aluminous rocks, which are well seen at Hamley 

 Bridge. At a distance of about five miles below Hamley 

 Bridge the river ceases to have a rocky bed and enters on the 

 maritime plains, which, as flood plains of great extent, owe 

 their existence to an antecedent svstem of drainage entirely 

 distinct from the present. Here it has cut for itself a pas- 

 sage through alluvial deposits, which, in places, form steep 

 and high banks ; the flow of water becomes sensibly dim- 

 inished after leaving the rocky portion of its course, and, in 

 summer, the lower portions of the river are either drv or 



