ICSI. Xo. II. THE STRANDFLAT AND ISOSTASY. 65 



Ringereide further west, near Lavik, there is a hanging valley at about 

 the same height, and a mountain ridge slightly higher. 



This plateau and hanging valley may possibly indicate' the approxi- 

 mate height of an initial Palæic valley of this region, which had been 

 developed to great maturity before the excavation of the present Sogne 

 Fjord began. 



Xear the mouth of Sogne Fjord the platforms of the strandfiat on 

 both sides of the fjord become conspicuously wider and more developed 

 than further in the fjord. 



The whole peninsula at Xasjc in Bo. with the Xæs Holm outside on 

 the north side of Sogne Fjord, is low and flat, and belongs to the strand- 

 flat (Fig. 37). 



At Riitlctafigcuc opposite this place, on the south side of the fjord, 

 there is an exceptionally well developed and level strandfiat, on the pen- 

 insula as well as on the islets outside (see Figs. 38 and 39), and this 

 plane is very distinctly marked as a formation different from the mountain 

 slope inside. Fig. 39 illustrates well the evenness of the plane. 



The surface of this strandfiat is seen in the panorama Fig. 39 taken 

 from a hill (28 metres above the sea) surmounting the plane. The surface 

 is somewhat undulating with small hills or knolls. The tops of most of 

 them are at the same level, measured to be 16 metres above the sea. Two 

 hills farthest out reach an altitude of 20 metres. Another level at which 

 the tops of some ridges are lying, is a little lower than the hill from which 

 the panorama was taken; they are about 25 or 26 metres above sea-level. 

 Only one ridge on the westernmost point reached an altitude of 32.5 

 metres. By far the greater part of this wide plane is, however, lying 

 between 15 and 16 metres above sea-level. The whole surface of the 

 strandfiat at Rutletangene is well rounded by the erosion of the ice. 



At D i ligenes south of the entrance to Sogne Fjord there is a well 

 developed and unusually level strandfiat (Fig. 41). Its average altitude 

 was measured (on Aug. 12th. 1911) to be 11.28 metres above sea-level. 

 A round knoll rises 3.38 metres above this plain to an altiti.de of 14.66 

 metres. The surface of the strandfiat is scoured and rounded by glacial 

 erosion as seen in Fig. 42. 



On the northern side of the entrance to Sogne Fjord indications of 

 a strandfiat, forming incisions in the steep mountain sides of sandstone, 

 were observed in the sound between Inner Sulen island and Losneoi 

 (Fig. 42 A), and well marked planes of the strandfiat were observed on 

 the two southern peninsulas of Inner Sulen and on the greater part of 

 Xæs Island (Fig. 21, no. 35) between them. A hill is rising above the level 

 of the strandfiat in the northern part of the latter island. The rock is 

 sandstone on these islands, with a border of phyllite along the south- 

 eastern side of Inner Sulen and the southern side of Losneoi. 



Vid.-Selsk. Skrifter. I. M.-X. Kl. 1921. No. 11. 5 



