Fra Hardangervidden III

Abstract

Forkortet: The border-lines on the southwestern and southern part of the map on p.29 are to be attributed to Mr.Bjørlykke, who had a very wild region to explore. His photo, reproduced on p.63, shows veins of granite in gneiss. The locality is within the great mass of old rocks pushed up over the younger ones. In the other picture on p.72, from the same region, a means phyllite, b means gneiss and banded quartzitic rocks. The great process of dislocation has altered the original structure of the masses. In the mountains of overthrown rocks, a \"fluidal structure\" (it is some kind of banking) is apparent when the mountain-sides are seen at some distance; the occurrence of rocks in the shape of lenses is also common; but the metamorphic phenomen on of deformations is most prominent, revealing itself in the fact, that the lower parts of the overthrown rocks are more finely grained than the upper ones. This fine-grained texture has been produced by the crushing of the original coarser-grained con- stituents. A microscopic investigation confirm this explanation.