163 



5 cm. in section. Fine-i,4-ained granulite or hornstone-like 

 varieties are also to be found. 



Besides stratifications of amphibolite, we find in these rocks 

 dikes of dioritic rocks, of which a few that were examined 

 microscopically proved to be garnet- and pyroxene-bearing rocks 

 of amphibolitic appearance, while in another case amphibole is 

 practically the only component present, with only traces of 

 biotite and felspar. Whether some narrow dikes of a black 

 compact rock, which occurred high up in the mountain 

 traversing the gneis, belong to this or to some other more 

 recent series, has not been determined. Limestone also occurs 

 in blocks. 



Furthermore, I here came across irregular veins of a hght 

 pegmatite, which possibly is connected with some lenticular 

 masses of light granite that could be observed further out in 

 the fjord. From these granites derive presumably a number of 

 blocks collected in part right inside Forsblad Fjord, in part in 

 Polhem's Dale, further out within the Cambrian-Silurian terri- 

 tory. One of these rocks, apparently corresponding to the light 

 pegmatite veins, is almost free of mica, contains some garnet 

 and has a fairly gneiss-like structure, as several of the mineral 

 individuals show markedly lacinialed outlines. Another, again, 

 is a fine biotite granite, with ore and zircon and large felspar 

 individuals, with their idiomorphic outlines very clearly defined. 

 Thi.< is less the case, on the other hand, with the smaller in- 

 dividuals in the mass proper, as secondary accretions here play 

 a much greater part; and yet it is still observable that the 

 quartz, as the last crystallized mineral, fills up irregular spaces 

 between the other individuals. 



Here were also found blocks of coarse rocks rich in horn- 

 blende, of somewhat divergent type. 



The district in question resembles Scoresby Sund in that 

 grey gneiss forms the chief rock in each, but differs from it 

 in the very varying appearance that the rocks display in so 



II* 



