I92I. No. II. THE STRANDFLAT AND ISOSTASY. 259 



the Ancylus Sea of the Baltic region. Hence the heights found for the 

 upper limit of submergence along the south coast of the Kola Peninsula 

 may possibly have to be somewhat corrected. 



Relation between the Altitudes of the two conspicuous Raised 

 Shore-lines in the Tromsø — Hammerfest Districts. 



Let us new stufly the relation between the heights of the two levels 

 represented by the two conspicuous raised shore-lines in the different 

 regions of northern Xorway. 



Tanner [1906, 1907] and Gronlie [1914] are probably right in as- 

 suming that the upper raised shore-line (of Heiland) in the Tromsø and 

 Hammerfest districts corresponds to the level of the Finmark shore-lines 

 which Tanner has called le. 



It seems to me to be probable that this shore-line marks the upper 

 limit of lateglacial submergence in these northern regions. If so, it 

 probably also corresponds to the level of the upper limit of submergence 

 (tlie upper marine limit) observed in the different parts of southern 

 Norway. 



It was previously mentioned (p. 251) that, the old raised shore-lines 

 and terraces, found l)y Ramsay, Tanner, and Grønlie above the level 

 corresponding to Tanner's le, may probably be survivals from a previous 

 submergence. 



The lower raised shore-line in the Tromso and Hammerfest districts 

 obviously represents the same level as Tanner's line IIA in Finmark. 

 There seems to be good reason for accepting Gronlie's and Tanner's 

 assumption that this shore-line corresponds to the so-called Tapes-level 

 in southern Norway. Grønlie therefore calls this shore-line the Tapes-line. 



Probably owing to the mildness of the Tapes climate, which has not 

 favoured the shore erosion by frost, this level is not marked by shore- 

 lines cut in solid rock south of the Tromso district (68th parallel), but 

 as a rule merely by marine terraces and wave-built shore ridges, which 

 are less reliable marks of the actual level of the shore-line existing at 

 the time of their formation. The surface of a terrace may have been 

 somewhat lower than the sea-level, and a wave-built ridge may have been 

 thrown up above high-tide level during storms. 



According to the figures given above, the height of the lower raised 

 shore-line (the Tapes level) is 37.4 per cent of the height of the upper 

 raised shore-line (the upper limit of submergence) at Havnnes, while this 

 percentage is 54.7 on Helgoi if the height of the Tapes-line be 9.3 metres. 

 According to what has been said above, it is obvious that this percentage 

 should decrease wath increasing height of the upper limit of submergence, 

 anrl it is therefore useless to try to find a fixed figure of percentage 

 which would suit all cases. 



