14 



which are dispersed grains of iron- ore, together with some 

 biotite. 



That these two last-mentioned detached Ч pieces of rock 

 belong to the Archœan rock is very probable, though here too, 

 as in a previous instance, the absence of true, coarsely-crystalline 

 gneisses and granites is remarkable. 



The other specimens consist of dark, diabase-like rocks. 

 One of them comes very near to the basalts described above, 

 though it is a good deal altered, and the presence of olivine 

 cannot be identified with any certainty. Another belongs to a 

 more particular type, as it contains porphyritic crystals of fresh 

 pyroxene, upwards of one centimetre in length, of which the 

 outermost sides only have partly changed to uralite. They 

 occur in a ground-mass, somewhat changed by weathering, rich 

 in ore, and also containing a great abundance of calcite, and 

 the most remarkable constituent of which is a brown, pleo- 

 chroictic hornblende in the shape of long needles (û light-yellow, 

 b dark-brown, с dark-brown ; с = b > a). 



The remaining specimens from this district are not of any 

 great interest. 



') The two specimens in question were certainly found detached, but 

 occurred in the immediate neighbourhood of and belong beyond doubt 

 to a series of very precipitous strata of strongly disintegrated schist. 

 The ravine formed by the disintegration of the above-mentioned preci- 

 pitous strata divided the peninsula of Nualik nearly parallel with the 

 large pegmatite dyke. Several such ravines divided the eastern part of 

 the tongue of land from the mainland, and at last broke it up into 

 several islets and rocks. The limestone and quartz occurred in several 

 places, but the specimens of druse and silica were collected from a 

 plavground for children in «the dead house». Its late inmates no doubt 

 picked them up in the neigiibourhood and brought them home as play- 

 things, as is customary among the Ksquimaux. A schist containing 

 light-colonred mica and quartz was found in situ on the small islands 

 of Apntitik just olf Nualik and the late inmates utilized them as paving- 

 stones for Uie lloor in several tents as well as in the deserted house, 

 and they also served as roollng material lor the entrance to the house. 



С Kruuse. 



