1921. Xo. II. 



THE STRAXDFLAT AND ISOSTASY. 



According to this table the land in southern Gottland should onlv 

 have been raised 28 to 30 per cent of the whole upheaval between the 

 maximum submergence of the Littorina period and the Aloppe period, 

 at the same time as the land in östergötland and \ iborg, Finland was 

 raised 44 to 49 per cent of that amount, and the land in the other 

 northern regions, mentioned in the table, was raised 52 to 58 per cent. 



Högbom thinks this is entirely opposite to what might be expected, 

 as we know that the upheaval of Gottland was '"completed long ago", 

 while the upheaval of the other regions mentioned is still continuing. 



T cannot quite follow Högbom's argtmient, for as far as I can see, 

 a continued upheaval of the land in the northern regions would reduce 

 the anomalies. If we assume, for instance, that in Upland the land w-ill 

 still be raised as much as 20 metres before the upheaval is completed, 

 we see that the Aloppe level will be raised to 55 — 58 metres above sea- 

 level and the Littorina level to 100 metres. Hence the upheaval of the 

 former level will be 55 to ^8 per cent of that of the latter one, which 

 will be nearer to the relation found on Gottland. 



A still better explanation of the observed anomalies may possibly 

 be obtained if we assume that there have also been two kinds of move- 

 ments of the shore-line after the time of the Aloppe culture, z'ic. one 

 due to the upheaval of the land, and another due to a sinking of the 

 sea-level. 



Let us assume, for instance, that the sea-level has sunk about 6 

 metres after the Aloppe period. Let us fvtrthermore assume that before 

 the upheaval is completed, the land will still have to rise, for instance, 

 15 metres at the Aloppe group, 13 metres at Alunda, 11 metres at Jätt- 

 böle (Aland), 2 metres at Mborg, and 7 metres at Säter (östergötland), 

 and nil on Gottland. The actual upheaval of the two levels, the sinking 

 of sea-!evel being deducted, will then be the following: 



Localitv 



Upheaval (in 



Metres I of 



Aloppe Level 



Uplieaval lin 



Metres I of 



Littorina Level 



Relation of 

 former Upheaval 



to latter Up- 

 heaval in fii'r cent 



Aloppe group 



Alunda 



Jättböle 



Säter 



Viborg 



Gottland . . . . 



-53 



54 



44 — 50 



45 55 



The differences in the relation between the heights of the two raised 

 levels given in this table are hardly greater than may well be due to 

 errors in the determinations of the heights of these levels. On the other 



