61 



Notes on the Glacial Features of the 

 Inman Valley, Yankalilla, and Cape 

 Jervis District. 



By Prof. T. E. W. David, B.A., F.G.S., and 

 W. Howchin, F.G.S. 



[Read June 1, 1897]. 



In 1859 Mr. Alfred R. C. Selwyn, Government Geologist of 

 Victoria, made a hurried, but extensive geological tour in this 

 colony by request of the South Australian Government. In his 

 official report he says : — "At one point, in the bed of the Inman, 

 I observed a smooth, striated, and grooved rock surface, pre- 

 senting every indication of glacial action. . . . This is the 

 first and only instance of the kind I have met with in Australia, 

 and it at once attracted my attention." This glacial pavement 

 was not subsequently observed till rediscovered by the authors of 

 this paper and Mr. C. C. Brittlebank in March last. The journey 

 was undertaken with the express object of investigating the 

 glacial features of the neighborhood, with the result that the 

 investigators are much impressed with the clearness of the 

 glacial evidences, as well as their magnitude. It is not intended 

 in the present paper to give a detailed description of the 

 observations made (that will take the form of a Report from 

 the Glacial Committee to the Australian Association for the 

 Advancement of Science), but it was thought desirable to give 

 an early and local statement of some of the leading facts which 

 have been obtained on this subject. 



On leaving Port Victor by the Inman Valley road, about one 

 and a-half miles from the township, numerous large blocks of 

 granite are seen in the paddocks on the left hand side of the road. 

 Similar erratics can be noted on the hillsides bordering the road 

 almost the entire length of the valley to Norman ville. 



In the bed of the Inman, a little west of the seventh mile- 

 post from Port Victor, a very fine exposure of a polished ice- 

 pavement occurs. It is situated on the North side of the stream, 

 within the limits of the flood-waters, and passes under a bank of 

 recent river silt. There is a continuous, highly-polished floor, 

 measuring 20 ft. by 6 ft., with a surface slightly sloping towards 

 the stream. It is deeply grooved and striated, the stria? having 

 a direction of W. 9J-° N., conforming to the general trend of the 

 valley. The stone which has taken the polish is a hard, dark- 



