100 HÅNS EEUSCH. [No. 2. 



schistosity. The strata stand vertically; there is "one cleavage 

 parallel to the stratification and another one, also vertical, nor- 

 mal upon the first. Under the microscope is seen, that the 

 quartz grains are all elongated. The yearly production from 

 this quarry is about 300,000 pieces. 



The Inner-Hardangerfjord-region and Hardangervidder!, 

 the mountain plateau to the East of the Hardangerfjord. Upon 

 the Archæan rests here the High-Mountains formation. Generally 

 the undermost part is phyllite and quartsite (Dictyonema sp. is 

 found), the uppermost consists wholly of crystalline schist, mica- 

 schist, gneiss, hornblendeschist ete. Brøgger thinks, that the 

 succession is normal, other geologists are of the opinion, that the 

 upper part is Archæan pushed over the rest, a view which 

 certainly looks very probable in some cases (see pag. 69). 



The flat mountains R and R on p. 73 consist of this „High 

 Montains formation " reposing upon the Archæan, in which there 

 are formed valleys with the lakes 1, 2, 3. 



In the map on p. 34 the undermost part of the ^High-Moun- 

 tains formation, is obliquely streaked; the upper part and the 

 undoubted Archæan are left white; the cross hachured parts are 

 dioritic rocks, which form the southerD outposts of the high 

 Jotun-montains. 



Where the plateau joins the side of a valley, the rock is 

 often rent with fissures running along the trend of the valley. 

 These fissures are probably formed by earthquakes. The fig. 

 pag. 24 shows some rents of this kind along the Serfjord, the 

 innermost branch of the Hardangerfjord. 



The fig. on pag. 30 shows a bank of granite divided up to 

 pieces by the withering (probably mostly by the frost) on the 

 high plateau. 



Perched blocks are often only remains of morainic matter as 

 shown p. 29, where the little river by b has washed the moraiue 

 a in such a way, that there only lie some few scattered huge 

 blocks upon the ice-smooted rock at c. 



In the common morainic stuff on the high mountain there 

 are found some peculiar small hills of small-grained gravel as 



