2-J.J: Carl Fred. Koklerup. [Nr. 8 



The other granitic rocks are of a very different aspect. Upon 

 the whole they are fine-grained or normal-grained, whitish or greyish; 

 and as a rule streaked. In addition to quartz and felspar whieh 

 also here is mainly plagioclase, we see biotite or muscovite, chlorite, 

 epidote, zoisite, apatite, zirkon, magnetite and pyrite. Most of 

 these rocks have a more or less developed detritus-structure. 



All these granitic dyke-rocks rich in plagioclase are likely to 

 be regarded as genetically connected with the grev granite and 

 similar granitic rocks previously described. 



In the Norwegian mountain-range we have had numerous 

 eruptions of diorites and gabbros (later on altered into saussurite- 

 gabbros) and white or greyish granitic rocks. The same has been 

 the case in the Samnanger-area, where the basic eruptives are 

 represented by saussurite-gabbros and their surface-rocks and tutfs> 

 which may be characterized as saussurite-diabases, green-schists. 

 hornblende-schists and similar, and where the acid igneous rocks are the 

 various, granitic and often gneissose rocks, the volcanic rocks of 

 which in the area of the Søndhordland-arches are proved to be 

 quartz-porphyries, and which in the Samnanger-area are probably 

 represented by some of the gneisses which occur in the phyllite- 

 zone. In my opinion the saussurite-diabases and the granitic dyke- 

 rocks correspond to the larger mass-eruptions above mentioned. 



The Archæan Rocks South of Vaksdal. 



(Pages 173-174.) 



As may be seen on the map. the district north of the labradorite- 

 rock-area presents a distinct "Schuppen-Structur" with alternating 

 zones of gneiss and phyllitc. These phyllites may be parallelized 

 with those occurring further west in the outer Bergen-arch, but 

 they are generally more strongly pressed, so that they approach 

 the mica-schists ; one of the types reminds onc of a phyllitc from the 

 town of Bergen in the inner Bergen-arch. These phyllite-zones 

 are pressed into the Archæan gneiss similarly to the altered Silurian 

 schists of the Bcrgen-arches. As for the gneiss, you will see from 

 the description of the section Trengereid— Vaksdal that it is chiefly 

 a biotite-gneiss of somewhat varying structure. It contains smaller 

 masses of amphibolite and veins of quartz and granite 



