254 



KRIDTJOK NANSF.N. M.-X. Kl. 



(niiin.ir I lolmscii ]iiiiii1s out lliat .\. I Icllaiul's incasurcmcnls of the 

 raised sliorc-lincs [Kjooj in llic 'Irom^o dislricl indicate a similar local 

 difference in the poslf^dacial upheaval near intrusive masses of g-abbro, 

 es]K'ciall\- consi)icu()Us in tlie rej^don of the f.yngen Peninsula. Grønlie 

 [1918] also niainlains lliat there has l)een appreciable U^cal differences in 

 llie uphea\al of llic land in the Tromso flistrict. 



Il was piH'\ iciusl}' nient ioiK'd that Kaldhol's measurements of the 

 hei^^'hts of the "upper marine lindt" in the region of Nord Fjord seem to 

 indicate considerable local \'ariations in the upheaval of the land, the 

 graillent varving even as much as from 1.2 to 3.6 per mille. His in- 

 vestigations in Nordnior [191^)] give similar results. As was previously 

 pointed out, however, the difficulty with these determinations of the 

 "upper marine limit" is first, that to a great extent they are based on 

 terraces of loose material which do not give the exact level of the shore- 

 line; secondly, they are marie in fiords, where ice-danuned lakes may easily 

 have been formed during lateglacial time, and the terraces may thus have 

 been formed at levels much higher than the sea. It is therefore of im- 

 portance to have it proved that the terraces actually arc marine. As the 

 same terrace cannot be continuously followed from one fjord to another, 

 it is often difficult to decide the identity of the terraces. 



Although these numerous observations by Kaldhol and others in the 

 fjords may, therefore, have to be carefully sifted, before conclusions of 

 wide bearing are drawn from them, still it is hardly doubtful that, on the 

 whole, they prove the probability of appreciable local differences in the 

 upheaval of the land, and that the gradient of upheaval may change ap- 

 preciably inside distances of no more than to to 20 kilometres. 



The investigations of the Swedish geologists also indicate similar 

 local differences in the upheaval of the land in Sweden. 



Tvlunthe's and Sundelin's map [Sundelin 1919, PI. X] of the raised 

 shore-line of the Ancylus Lake along the east coast of Sweden, in östcr- 

 götland and Småland, shows that the gradient of the upheaval of this 

 shore-line varies a great deal inside the region of the map. Inside a 

 distance of about 90 kilometres the gradient may increase from 0.24 per 

 mille in the region of A^ästervik and Oscarshamn, to about 0.50 per mille 

 in the region of Söderköping, Norrköping, and Linköping. The gradient 

 of the upheaval of the Littorina shore-line seems to differ even still more 

 locally in this region. 



Similar local variations of the gradient of upheaval have been found 

 at a good many places in Sweden, by the measurements of the heights of 

 the "upper marine limit", as well as of the shore-lines of ice-dammed lakes. 



The isobases drawn in Fig. 166 are not intended to show the possible 

 local variations in the gradient of upheaval of the Norwegian coast. It 

 was rather attempted to give a general idea of the upheaval according 

 to the most trustworthv observations. 



