810 MR D. FERGUSON ON 



These rocks, from their appearance and position, are much like those of Cape 

 Pariadin, but if they are identical, specimens recently obtained show they are pene- 

 trated by igneous rocks. 



Port Gladstone and Possession Bay. 



The rocks of the Middle or Lower Series are well exposed in Port Gladstone 

 Harbour. The steep conical hill at the upper end of Port Gladstone (PI. XC, fig. 2) 

 presents a fine section of the rocks of the middle division, which are some 1500 feet 

 thick and rest on the lower division, which descends below sea-level. 



In Possession Bay the middle division extends from a little above sea-level to 

 the hill crest seen above the ice-fields of the Great Glacier. The lower division forms 

 a fringe near sea-level and descends below it. 



Locally the dip is in all directions due to folding and crumpling. A good 

 instance of this is seen in PI. XC, fig. 2, where the rocks in the conical hill are 

 almost flat, while those to the right of it, extending to the little ice-field and corrie, 

 are nearly vertical. This steep dip is due to a fracture plane, along which a former 

 glacier scooped out the harbour of Port Gladstone. It has been formed in exactly 

 the same way as Leith Harbour, but there the glacier has only receded and still exists. 



Another fine example of folding and erratic dips is seen in PI. XCI, fig. 1, in the 

 escarpment on the south side of Port Gladstone Harbour. The folding occurs along 

 a fracture parallel to that in which the harbour has been cut out. At one place the 

 rocks are vertical, and to the south side of the fracture plane they are horizontal. 



The rocks of this locality all belong to the middle division. Allowing for all the 

 eccentricities of dip, due to folding and fractures, there is a general dip to the 

 south-west. It is not very evident at any one point, but viewed as a whole the 

 rocks appear to be gently sinking in that direction. 



Port Gladstone to Adventure Harbour. 



The rocks along the coast from Port Gladstone to Elsie Harbour belong for the 

 greater part to the middle division. The lower division sinks under the sea as we 

 proceed to the north-west. At Cape Buller, Welcome Island, Right Whale Bay, and 

 Cape North the rocks belong to the middle division. Between Cape North and 

 Elsie Harbour the middle division forms all the coast-lands up to the ice-fields behind 

 it ; but the heights beyond are probably of rocks belonging to the upper division. 



At Elsie Harbour the middle division disappears, and the upper division is exposed 

 on its western side. There may be a fault running through the line of Elsie Harbour 

 and St John's Harbour. They form a low depression right across the island (PI. 

 XCI, fig. 2), which has been cut through by a glacier, and is now blocked in the 

 middle by several miles of glacial detritus. This morainic material has produced 

 two of the most useful refuge anchorages in the island. 



