222 Carl Fred. Koldemp. [Nr. 8 



which may be seen in fig. 9. There we also see how this peri- 

 dotite is penetrated by veins of a coarse-grained gabbro-rock, which, 

 owing to its greater power of resistance to weathering, pro trude 

 on the surfaee of the rock. The coarse-grained dyke-rock consists 

 of plagioclase, monoclinic pyroxcne, some rhombic pyroxene and ore. 

 Contrary to the felspars of the surrounding saussurite-gabbros, the 

 plagioclase is not saussuritisized. 



At a height of 420 ni. there is a flake of similar kind, and 

 the rock must nere be designated as a felspar-bearing peridotite. 



At a height of 440 m. a. s. we lind flakes of a serpentine 

 rich in tale which is constituted by white tale and dark-green 

 serpentine in granular aggregates. This serpentine is penetrated 

 by several dykes of a coarse-grained gabbro-rock. 



Flakes of felspar-bearing peridotite occur at a height of 470 m. 

 a. s. The essential mineral is olivine; furthermore some monoclinic 

 pyroxene and a fair amount of plagioclase are present, so that the 

 rock is forming a transition to the troktolites. The plagioclase 

 is not saussuritisized, and the olivine is only slightly altered. This 

 rock is penetrated by dykes of coarse-grained saussurite-gabbro. 



At a height of 500 m. a. s. in the immediate neighbourhood 

 of some small tårns we find a flake of a serpentinized rock, the 

 dimensions of which may be seen in fig. 10. In the picture we also 

 see how veins from the surrounding saussurite-gabbro penetrate 

 into the flake. The rock is an olivine-bearing pyroxenite, which 

 is serpentinized. 



In the south part of the saussurite-gabbro-area, as for instance 

 in the district S. S. W. of Søndre Trengereid, a number of dykes 

 of white granite occur. The granite of these dykes is in great 

 part constituted by plagioclase, strongly altered by weathering, 

 orthoclase, quartz, and some biotite. 



In Kuftefjeld, at a height of 520 m. a. s., a dyke of light- 

 coloured granite-porphyry occurs near the river. In the white, 

 fine-grained mass of felspar which constitutes the essential com- 

 ponent of the rock, we see a great number of bluish-grey grains 

 of quartz, which in part are almost crystals. (Figs 11 and 12). On 

 a closer investigation we also see a great number of fairly large 

 individuals of felspar in the fine-grained mass. These, as well as 

 parts of the felspar of the groundmass, are plagioclases. 



