11 



All tlie specimens from Ikersuak M are of greenstone, viz. 

 both a collection labelled «Talus», and a light-grey, rather solid, 

 eruptive rock, probably a dyke. The latter has a strongly dia- 

 base-Hke appearance, and the bands of plagioclase are more 

 completely altered than is the case with the basalts of this 

 district; this also applies to the augite. Chlorite and epidote, 

 on the other hand, occur abundantly-); olivine I have not 

 observed, in the former collection there is another eruptive 

 rock which seems to be the margin of a dyke similar in type 

 to the one just described. It is an augite-porphyrite with por- 

 phyritic crystals of a somewhat prismatical plagioclase, and 

 augite in a mass so dense that its constituents cannot be dis- 

 tinctly separated from each other. Besides these rocks there 

 are others of a different appearance, one of them a diabase of 

 basalt-like type, but much altered, the augite being converted 

 to uralite, and the titanic iron changed to leucoxene, while the 

 presence of olivine cannot be identified with any certainty. Of 

 more interest is a true amphibolite consisting of dark-green 



consequently chose to gather everywhere small specimens of such rocks 

 as appeared to me to be uncommon, and beyond this only to collect 

 minerals from the numerous greenstone and pegmatite dykes. In a 

 single case only I regret not having been able to collect specimens of 

 a remarkable rock, viz. a peculiar conglomerate which occurs along the 

 shore from Langø to Cape Christiansen and which formed the base of 

 (he islets (SmaaholmeneJ and of several promontories It consisted of 

 a black, grained base, with light coloured grains, Ь 30 cm. in diameter, 

 disseminated through it. С Kruuse. 



') The locality consists of a mighty wall of rock about 2000 feet in height 

 and parallel with the coast; the rock is on the north side of the pro- 

 montory between the two southerly glaciers and is traversed by erup- 

 tive dykes parallel to the wall, while at its foot in the shelter of a small 

 promontory -^ a block standing in the back-ground some 50 feet in 

 height ~ has been accumulated an immense talus of large sharp-angled 

 blocks which have tumbled down from the rock wall. The work of 

 demolition has been very violent, and many of the blocks have been 

 broken off recently. C. Kruuse. 



') Ihe wall of rock is. as it were, powdered over with liglit-greeii dusl. 



C. Kruuse. 



