1914—15] Fj eldby giringen mellem Sørfjorden og Såmnangerfj orden. 221 



sized biotite, some small sericite-folia and zoisite-crystals, and finally 

 some very small crystals of garnet. Fig. 5 shows a similar intrusion 

 of smaller veins of compressed granite in the saussurite-gabbros. 



Somewhat south-west of the flake of gneiss-conglomerate, which 

 will be mentioned later on, we tind flakes av saussurite-gabbros which 

 are traversed by numerous granitic dykes, sufficient to give the 

 whole the aspect of an eruptive breccia. 



In the typical greyish and schistic rock we macroscopically 

 see felspar, quartz, and iinally muscovite and a bright-brown biotite. 

 Under the microscope we see that the felspar is partially plagio- 

 clase, and that it often holds enclosures of zoisite-individuals. 



On the borders the granite shows some peculiar types. On 

 the border against the saussurite-gabbro to the south of Haugen 

 we tims have a compact, greyish-green felsitic rock, which to some 

 degree reminds one of the quartz-porphyries from Bømmel, describedby 

 Reusch. or also of felsophyres; the porphyric individuals, however, 

 have been crushed. (Fig. 7.) 



A somewhat similar border-rock was found in Trengereidnipen ; 

 macroscopically the rock appears to be dense gneissose, greyish- 

 coloured and of a somewhat felsitic aspect. By microscopical in- 

 vestigation we see that rather coarse-grained, strongly compressed 

 aggregates of felspar are enclosed in a iine-grained detritus, con- 

 sisting partly of felspar and quartz, and partly of small crystals 

 of epidote and sericite. In spite of the pressures having effaced 

 the original structure, there seems notwithstanding to exist single 

 microfelsitic parts. 



Fig. 8 exhibits a gneissose conglomerate with boulders of quartz, 

 1 — 10 ems. of length, from a little valley northeast of Southern Maase- 

 tjern. This flake of conglomerate in the gneissose granite is of 

 80 m 7 s. length and 8 m's. breadth ; in its neigbourhood we observe 

 several smaller flakes situated in the same way as the larger one. 



In Søndre Gulbotn (Southern Gulbotn) there are some flakes 

 of serpentinized rocks in the saussurite-gabbro. At a height of 

 about 250 metres above the level of the sea at the south of the 

 circus (botn) Ave thus tind an occurrence of soapstone in the river- 

 bed, constituted by biotite, chlorite, talk, and actinolite. The length 

 of it is 250 metres, its breadth up to 30 metres. 



If we continue farther upwards along the south side of Søndre 

 Gulbotn, we flnd likewise near the river and at a height of 400 m., 

 flakes of a serpentinized peridotite, the rough weathered sur face of 



