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dike rocks, among them also alnöite-like eruptives, all forms 

 that have their striking analogies among the eruptives of the 

 Paleozoic epoch on the opposite side of the Atlantic Ocean. 



The rocks that date from the Rhaetic age or younger 

 periods until the Eocene, possess quite another character than 

 those just described (cf. p. 185). Throughout it clearly appears 

 that all these rocks are shore formations, with which, too, the 

 occurrence of plant remains at several levels should be con- 

 nected. From the beginning of the Tertiary period a renewed 

 epoch of volcanic activity entered, which as far as East Green- 

 land is concerned, seems to have been confined to the coast- 

 belt, and there chiefly to the broad mass which at its centre, 

 S. of Scoresby Sund, projects towards the east, an outward 

 bend that seems to owe its existence to just that same cause. 

 Moreover, as is well known, traces of this volcanic activity are 

 found along a broad strip straight across the North Atlantic 

 Ocean. A last trace of the same is afforded in Greenland by 

 the hot spring I came across at Henry Peninsula, in the course 

 of the Expedition. 



It was specially interesting to be able, through finds of 

 marine fossils and plant remains occuring together in Eocene 

 beds, to settle not only that this volcanic activity, so important 

 for the North Atlantic areas, was already in full swing at the 

 period mentioned, but that the Tertiary (so-called Miocene) flora, 

 known through numerous finds in different Polar regions, already 

 existed at that time. 



It is probable that the land at that or about that period 

 had a far greater extent than at the present time. The country 

 has been subjected to a very extensive valley-formation. Several 

 of the chief valleys can be proved to stand in connection with 

 faults, viz. for instance Hurry Inlet, on the E. side of which 

 friction breccias can be pointed out at several places. That 

 the valleyformation is in part older than the eruption of the 



