162 



indicating that the rocks were originally composed of normal 

 granites, have not come under my notice; indications, too, of 

 porphyritic structures are rare. 



A strongly weathered biotite-gneiss from the interior of 

 West Fjord contains, besides garnet, a mineral that seems to 

 be a rhombic pyroxene. In the same fjord lies a locality called 

 "Black Point" (Sorte Pynt), the hornblende rock of which also 

 has a peculiar appearance ; it has probably been originally a 

 pyroxene rock. Noteworthy are also the rings of garnet that 

 here surround hornblende individuals. 



A remarkable quartzite formation appears in the middle of 

 the archæan rocks, on Milne Land right opposite Rode I. 

 One is inclined to connect it .with the peculiar conglomerate 

 that appears on this island, and, as a matter of fact, it presents 

 an appearance that is very young for a quartzite of archæan 

 age, but microscopically it reveals itself as entirely crystalline, 

 and no proof can be produced that we have here a deposit 

 younger than the youngest primary rock. If only for the help 

 this rock might offer to the understanding of the tectonics and 

 the problem of fjord formation of the district, a closer examina- 

 tion would be of interest ^). 



B. The Central JHass within Hong Oscar Fjord. Here 1 had an 

 opportunity myself of collecting a series of specimens at the 

 bottom of Forsblad Fjord. The rocks here show very striking 

 dissimilarities to those appearing at Scoresby Sund. The chief 

 rock is a medium grained biotite-hornblende gneiss, often finely 

 striped, with now the one and now the other mineral predo- 

 minatingly or exclusively present, and alternating with lighter 

 layers where both retire. More or less plentiful in the rocks 

 is garnet, which sometimes collects into lumps of more than 



^) A thin-slated quartzite of youthful appearance was found by Nathorst 

 in Alp Fjord, within the district inside Kong Oscar Fjord, to be des- 

 cribed presently. 



