1 92 1. No. II. THE STRAXDFLAT AND ISOSTASY. 269 



the level of the shore-line before the last glacial and postglacial sub- 

 mergence, may be assumed to stand about ly or i8 metres above present 

 sea-level along the north coast. Init perhaps slightly lower along the south 

 coast of the peninsula. It is, however, a remarkable fact that there seems 

 to have been no upheaval at Ponoi on the easternmost coast. If so, we 

 must assume that the level of the strandfiat has here been depressed. 

 \\'e may discuss this (]uestion later. 



The Upper Limit of Submergence and the Tapes Level along the 

 Norwegian Coast south of the Tromsø District. 



In Norway south of the region of Ofoten and \*esterålen, there are 

 as a rule no raised shore-lines cut in solid rock, corresponding to the 

 lower shore-line, the Tapes-line, of the Tromso and Hammerfest districts. 

 As was previously mentioned, the explanation is, probably, that, during 

 the warm Tapes period, the climatic conditions in these more southern 

 regions were no longer favourable to the frost erosion of shore-ledges in 

 solid rock. In these regions the Tapes-line is therefore marked by marine 

 terraces only and by shore-ridges built up of loose material. 



J. H. L. A'ogt, Rekstad, and Hoe! have observed two raised shore- 

 lines, cut in rock, in Tysfjord, Helgeland (\ ik, Leka), and also near 

 Trondhjem, but the lower of these shore-lines, at any rate, does not 

 correspond to the Tapes-line of northern Norway. The two raised rocky 

 shore-lines observed by Kolderup in the region near Bergen are obviously 

 from a different period. 



The table pp.270 to 272 gives the observed heights (in metres) of 

 the upper limit of lateglacial submergence and of the Tapes-line at several 

 places along the Norwegian coast where the observations might be con- 

 sidered to be fairly reliable. The heights of the Tapes-line computed by 

 our formula (2) from the ol)served heights of the upper limit of svd:)- 

 mergence, are given in the fourth column. 



On the whole, the observed and the computed heights of the Tapes- 

 line agree fairly well, considering that the observed heights are based on 

 measurements (very often with the aneroid-barometer) of raised terraces 

 of loose material, which may often have been somewhat lower than the 

 level of the actual shore-line when they were formed, wliile on the other 

 hand shore-ridges (of pebbles) may often have been built up by waves 

 a few metres above the mean level of the shore-line. It is also very often 

 difficult to decide what has been the actual level of the Tapes-line, without 

 finds of fossil shells. And where shells of the Tapes-period are found in 

 the terraces, it may be very difficult to decide exactly at what depths 

 below the sea-surface they have been living, when the terrace was formed. 



Nevertheless, it is a striking fact that especially those heights in our 

 table, which are based on the most reliable observations (printed with 



