NO. 2.] GEOLOGICAL SKETCH BY NANSEN 



27 



„20, the basalt in some places is so intimately connected with the fossili- 

 ferous strata, that it is impossible to assume that the lava flows could have 

 extended over these strata in the manner they have done, if they had been 

 discharged as late as during Tertiary times". 



I have said before that the tiers of basalt at Cape Flora are possibly not 

 quite horizontal, but dip perhaps a little towards the north. This seems to 

 be still more the case a little farther east, in the Gully Rocks and on Gape 

 Gertrude, which is only 3 or 4 miles (6—7 kilometres) east of Gape Flora. 





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Fig. 5. Cape Gertrude. Drawn from a photograph by F. N. 



That such is the case is indicated in a rough sketch, by Dr. KcettHtz, of 

 Cape Flora, Gully Rocks, and Cape Gertrude, taken from near Windward 

 Island, 6 miles to the north (fig. 4, p. 6), which sketch he has kindly placed 

 at my disposal together with a good many others. 



Fig. 5, which is a drawing I have made from one of my photographs of 

 Cape Gertrude, shows distinctly this dip of the basalt, and its exact dimensions. 



This dip of the basalt flows may perhaps be sufficient to account for the 

 fact that, according to Koettlitz, the basalt reaches down to the sea, on the 

 North side of the peninsula, at the bay (fig. 6, 6) — „the head of Gilnther 

 Bay" — north-east of Cape Gertrude i, at the north end of the valley separat- 

 ing the hill of Cape Gertrude from the east part of Northbrook Island. If 

 we assume the distance between these two places to be as much as 

 5 or 6 kilometres (3 miles) and the base of the basalt at Cape Gertrude 

 to be 180 metres (600 feet) above the sea the dip found in the photograph 

 represented in fig. 5, which is about 33 metres for every kilometre in a 

 northerly direction, would alone be sufficient to account for this fact. 



' See Koettlitz, Quart. Journ. Geol. Soc, 1898, p. 635. 



