lii. 



nected areas on the east side of St. Vincent's Gulf, viz., the 

 Myponga Flat, and the "Willunga Plain. Other patches of smaller 

 size are the ridge which extends from Adelaide to the Stockade, 

 and at Gawler, and at further points still further north towards 

 the head of the Gulf. These are remnants of a vast sheet which 

 must have occupied the greater part of what is now St. Vincent's 

 Gulf, as similar beds form the north-west coast line of Kangaroo 

 Island, and the whole of Southern Torke's Peninsula, extending 

 as a littoral fringe as far north as Ardrossan. On the shores 

 of Spencer's Gulf these strata continue northward beyond 

 Wallaroo, and probably continue around the head of the Gulf. 



Mr. Tepper has occupied himself with the stratigraphical 

 phenomena of these rocks about Ardrossan, and has endea- 

 voured to bring them in accordance with those at Aldinga, 

 briefly sketched by me in last year's " Transactions." 



The Bunda Basin, details concerning which have been com- 

 municated to you in my paper " On the Natural History of the 

 Bunda Plateau," published herewith. 



It is probable that the marine beds do not in either the 

 Murray or the Aldinga Basins rise to more than 200 feet above 

 sea level, and that the general upper level does not exceed 150 

 feet ; but their elevation is certainly as much as 250 feet in the 

 seaward edge of the Bunda Plateau, and must be at least 100 

 feet more in its interior. 



Correlation and Age. — The Bev. Mr. "Woods has grouped what 

 I have called the Oider Tertiary rocks of the South-East Plain 

 into three divisions, based upon physical, lithological, and 

 pala3ontological differences. Independent observations on the 

 rocks of the Murray Cliffs and of the Aldinga and Bunda 

 Basins have led me to the adoption of a like classification ; 

 though I am not sure that the arrangement is identical in each 

 case, and it is certain that we are not in accord as to the cor- 

 relation of the various members in the eastern and western 

 parts of the Murray Basin, and their relation to the Victorian 

 beds. 



In the following table I have arranged the divisions 

 recognised by me, in reference to typical sections in each of 

 three basins : — 



