part 1] PROCEEDINGS OF THE GEOLOGICAL SOCIETY. XI 



unconformity. Definite fossil evidence is difficult to obtain, but 

 Araucarioxylon has been identified by Prof. W. T. Gordon, which 

 would point to an age not older than Lower Carboniferous. This 

 fossil came from the Bay of Isles, and was found in what the 

 Lecturer believes to be the younger series. The rocks all show 

 signs of metamorphism, and the strike of the folds and lamellse o£ 

 the phyllites would point to the fact that the pressure came either 

 from the south-south-west or from the north-north-east. Con- 

 siderable faulting was observed, both normal and reversed. 



The igneous complex east of Cooper Bay can be differentiated 

 into two separate areas : (1) north of Drygalski Fjord, and (2) at 

 Larsen Harbour. In the former area quai tz-diorite, peridotite, 

 aplite, and syenitic lamprophyre with basement gabbro occur ; in 

 the latter area were found spilitic lavas (containing much epidote) 

 and basement gabbro. The general types are not Andean. 



Elephant Island is situated in the Powell Group of the South 

 Shetlands. Topographically, it is an ice-covered plateau rising- 

 to about 1200 or 1500 feet above sea-level. The rocks on the 

 northern shore have been described by Mr. Wordie as contorted 

 phyllites. The Lecturer's observations at Minstrel Bay on the- 

 western coast showed that the rocks there were similar. At Cape 

 Lookout, on the south side of the island, a metamorphic series was 

 encountered : this, according to Dr. C. E. Tille} r , consists of 

 amphibolite, garnet-albite-schist, quartz-horn blende-epidote-schist, 

 and banded sand} r limestone. 



Observations from the ship were made of the volcanic island of 

 Zavodovski, in the South Sandwich Group The Tristan da 

 Cunha Group in the Southern Atlantic, 1500 miles west of the- 

 Cape of Good Hope, was also visited. The islands are of volcanic 

 origin. Particular attention was paid to the existence of Middle 

 Island. 



Gough Island lies more than 200 miles south of the Tristan 

 da Cunha Group, and is 8 miles long by 3 miles in width. It is a 

 monoclinal block, with dip-slopes to the west and escarpments to 

 the east. The lavas forming these features are basaltic, and in- 

 trusive into these lavas is a trachytic stock. Following this 

 intrusion, the basalts were cut by a series of doleritic dykes. In 

 general, it may be said that Gough Island presents many features 

 similar to those that characterize the islands of Ascension and 

 §t. Helena. 



Discussion. 



Mr. J. Quiller RowETT laid stress on the fact that Shackleton's 

 great ideal was to promote the progress of science and to facilitate 

 scientific research. The Expedition had added to our history a 

 page worthy of the highest traditions of British exploration and 

 British endeavour. 



Mr. W. Campbell Smith said that the rocks collected by the 

 Lecturer on Gough I. and in the Tristan da Cunha Group would 

 prove of great value. Despite the fact that the Lecturer had 



