232 



graphical features of the respective areas as well as in a 

 variation of the ice-flows. It would follow as a matter of 

 course that the higher plateaux would be covered with a thin- 

 ner ice-sheet than the valley troughs, in which latter the 

 heaviest work of ice-quarrying would, take place. It is also 

 possible that the ice-sheet which reached the eastern side of 

 the ranges came from a somewhat different direction and 

 passed over different country than the western portions ; and, 

 if so, some diversity in their respective morainic material 

 might be expected. Another possible explanation might be 

 suggested in that the large erratics are mostly included in 

 the true boulder clay of the Inman and associated districts, 

 whereas in the eastern districts this lower bed has been but 

 slightly eroded and exposed. 



Much light would be thrown on this part of the subject 

 if portions of the glaciated pavement were discovered carry- 

 ing toolmarks, which would at once settle the question of the 

 local lines of dispersion. At present no such exposures of 

 the glacial floor are known to occur in the district. Great 

 thicknesses of morainic material occupy the depressions and 

 obscure the bed-rock, except in the greater heights which rise 

 above the sandy country; but in such cases the immediate 

 junction between the old rocks and overlying glacial beds is 

 usually covered by a talus, resting on a steep slope, which 

 prevents observations of the kind desired. The outcrops have 

 been but imperfectly examined, and a search with this specific 

 object in view might possibly lead to the discovery of the 

 evidences referred to. 



II. PHYSIOGRAPHICAL. 



The country indicated above may be regarded as a phy- 

 siographical province, bounded by the Willunga Ranges on 

 the north, the neighbourhood of Currency Creek on the 

 south, Hindmarsh Valley on the west, and the River Mur- 

 ray Valley on the east. It forms the water-parting between the 

 east and west drainages ; the River Finniss, the Black Swamp, 

 and Currency Creek flowing in the former direction, and the 

 Myponga River in the latter (see map, plate xxxi). 



The traveller, after climbing Kernick's Hill, from Wil- 

 lunga, crosses the Willunga Ranges and enters a large basin 

 which must impress even the casual observer as possessing 

 striking features, and, in some respects, unlike any other 

 portions of the State. A wide sandy valley is in front of 

 him, in which the head- waters of the Rivers Finniss and My- 

 ponga overlap each other and compete for the drainage of the 

 flat watershed (plate xxxii.). On the southern side of this 

 vallev there rise the rounded forms of Mounts Com- 



