15 



Résumé. 



As a summary of the petrographical conditions of the paris 

 of East Greenland with which we have been dealing, the fol- 

 lowing points may be noticed: — 



The rocks between Angmagsalik and about lat. 66° 30' N. 

 are chiefly composed of gneisses, generally rich in garnet. 

 Besides this there are several specimens of pegmatites, and it 

 is probable that true granites also occur, but this cannot be 

 proved from the material collected. The latter contains, on the 

 other hand, some greenstones (collected from dykes) of a nearly 

 related type, which from a petrographical point of view resemble 

 so closely some basalt dykes in the neighbourhood of Scoresby. 

 Sound that they ought doubtless to be classed with them. These 

 dykes, however, do not seem to be common here. 



Of the rocks containing bronzite, of which several varieties 

 seem to constitute the bulk of the rocks around the trading 

 station of Angmagsalik there are no specimens in this collec- 

 tion and they are therefore probably not widely distributed. 



One of the specimens, however, found some 55 miles JNW. 

 of Angmagsalik approximates to them; it is an amphibolite- 

 [»ikrite containing pyroxene and spinel, and is related to the 

 rock from the interior of Scoresby Sound described by Bay 

 and 11 s sing. 



In the northernmost part of the district between lat. 66° 33' 

 and 67° 1 5' IN", the rocks seem to change their character. Of 

 granites, only pegmatites and micropegmatitic veins occur. True 

 gneisses are wanting in the collection, and from one locality 

 only there are a few specimens of a rather peculiar grannlitic 

 schist. Basic rocks, on the other hand, are of much more 

 frequent occurrence, most of them being diabases which ap- 

 proach more or less to Ihe basalt type, and may very well 

 belong to the same late- or post-mezozoic period of formation 



