152 



Paper. — " Notes on the Geology of Encounter Bay," by 

 Geoffrey Duffield, B.Sc. In this paper Mr. Duffield described 

 two exposures of raised beaches, one situated about three- 

 quarters of a mile up the laman River, in two sections, separated 

 by a quarter of a mile, and reaching a maximum thickness of 16 

 feet. The other exposure occurs in the railway cutting near the 

 mouth of the Hindmarsh River, at about 20 feet above high-water 

 mark. Several erratics of granite not previously noted were 

 observed at the back of Mr. Cudmore's house. One measured 12 

 feet by 10 feet. Brown's Hill, situated N.W. of Victor Harbor, 

 is mainly composed of a highly silicious quartzite rock, with a 

 dip of 70^ and a strike of 30° W. of S. As the beds extend in a 

 south-westerly direction they become more micaceous, with veins 

 of quartz, but the dip and strike reoaain unaltered. Rosetta 

 Head is a granite mass intruding into the quartzites and schistose 

 rocks. The junction shows contact metamorphism. On the sea- 

 ward side of the Head a diorite dyke penetrates the granite, 

 with a strike parallel to the face of the cliff for the depth of a 

 hundred yards. A second granite outcrop is seen on the land- 

 ward side, separated from the main mass by a belt of quartzite. 

 Granite Island was described as consisting chiefly of granite, but 

 includes two well-defined quartzitic areas within the granite mass, 

 which have been more or less altered by contact with the latter. 

 The granite has also caught up into its flow many isolated frag- 

 ments of the adjacent beds, which have preserved their sharply 

 angular outlines without apparent alteration. 



Annual Meeting, October 1, 1901. 



Prof. E. H. Rennie, D.Sc. (President^ in the chair. 



Exhibits. — Walter Howchin, F.G.S., some specimens of 

 quartzite from near Petersburg, showijig striations due to ice 

 action, and a block of graphic granite similarly marked. There 

 being none of the latter rock nearer than Yorke's Peninsula, this 

 piece of rock would seem to indicate the general direction of the 

 ice movement during the Cambrian period. 



Annual report and balance-sheet were read and adopted. 



Election of Council. — President, Prof. Edward H. Rennie, 

 M.A., D.Sc, Lond.; Vice-Presidents, Walter Howchin, F.G.S., 

 AV. L. Cleland, M.B.; Honorary Treasurer, Walter Rutt, C.E.; 

 Honorary Secretary, G. G. Mayo, C.E.; Members of Council, 

 Rev. Thos. Blackburn, B.A., Sam. Dixon, W. H. Selway, Edwin 

 Ashby, A. M. Morgan, M.B., Ch.B., and W. B. Poole; Auditor, 

 J. S. Lloyd. 



The Presidential Address read by the President, upon the 

 motion of W. Howchin, seconded by Sam. Dixon, was ordered 

 to be printed in the Society's " Transactions." 



