lOO FKID'IJOK NANSF.N. M.-X. Kl. 



lliaii Uli tlicir tciiflciicy tu he split hy tlic frost or lo form n rouj,''!) surface 

 lo l)c att.ickcil hy tlic iiio\ inj^- icc. it is for instance striking that the 

 granites haw in sonic rc-j^ions been (juitc as nnicli croflc-fl as the much 

 softer schists, |)roI)ahly because they have as a rule a r^Ai^her surface. 



Jæderen. 



ja'fleren or j.'eren is the low l;iiif| exteii'lini,'' aloiii,'' tlie coast between 

 the Stavanj4"er Peninsula to tht- north aiul the J'-f^a-rsuiul rej^^ion to the 

 south. It is II to 13 kilometres l>road and bounderl along its eastern side 

 by a mouiUainous land (of Archæan rocks) rising- more or less abruptly 

 above the plain, w ith comparatively steep mountain slopes, to altitudes of 

 100 to 200 or even 250 metres. 



The plain of Jæderen is formed to a ^"reat extent by quaternary, 

 chiefly glacial, accumulations which have filled u]) the depressions and 

 hollows of the rocky ground, often to great thickness. In numerous spots 

 here and tliere tlie bare rock appears, however, in tlie surface of the plain, 

 and in the northern and southern part of the plain this is even the case 

 near the outer coast line [cf. the map by Grimnes, 19 10]. 



The plane indicated Ijy these exposures of bare rock has a height 

 above the sea of about 15 to 25 metres, near the coast, in the region of 

 Sele and Byberg and eastwards to Hegre in the northern part of Jæderen, 

 south and southeast of Hellesto (Hâland). According to Bjorlykke [1913. 

 p. 16] the protruding rocks southeast of Sele are hornblende- and mica- 

 schists. According to Grimnes's map the protruding rocks rise to higher 

 levels, al)Ove 50 metres, in the region further inland towards east-south- 

 east, at Svensvoll, Lea, and Skjæveland, where the rocks consist of a grey 

 gneiss [Bjorlykke, 1913I. 



Further east towards the foot of the mountains forming the eastern 

 boundary of the plain, the level of the rocks is again lower, about 25 metres 

 or even less, and at Åse, north of Holland railway-station, Bjorlykke ob- 

 served hornblende-schists and layers of brown granular limestone (marble). 



Further south, between Bore and Kiep, there are rocks of mica-schists 

 and gneiss rising to 50 and even 75 metres above the sea. at a distance 

 of only 3 to 6 kilometres from the coast. 



Rocks of hornblende-schist, gneiss, and amphibolite rise to similar 

 heights of between 50 and 75 metres in the region south of Kiep towards 

 Tu, where the hill Tua or Tinghaug (hornblende-schist and amphibolite) 

 is even higher. 



An almost continuous region with numerous exposures of Archæan 

 locks, chiefly gneiss, and hornlilende-schists [Bjorlykke, 19 13, p. 15], ex- 

 tends from Nærbo towards east-northeast. The rocks (gneiss) in the 

 western part of this region, at Bjårland north of Nærbo. 4 kilometres from 



