225 



Lastly, as has already been mentioned, a basalt dike of 

 normal appearance^), macroscopically as well as microscopically, 

 was round interspersing the sedimentary rocks and the curious 

 eruptive series at C. Fletcher. At C. Brown, too, basalt seems 

 to occur. Here, however, we are already nearer the N. basalt 

 area. 



Topographical Description. 



As has been hinted above, two main types, topographically, 

 can be distinguished in the parts of Greenland under con- 

 sideration, viz. an inner central mass, to which only the 

 larger fjords with their deeper forks extend, and which can be 

 characterized as a kind of plateau-land in which distinct ridges 

 and for the inner regions also peaks may be lacking or un- 

 obtrusive, and an outer, more or less sharply broken up coast 

 border. This latter, in its turn, may be divided into two main 



in the river inside Fleming Inlet, and thus seem to be charactistic of 

 this area. The few specimens I could bring along from these remote 

 parts belong to a curious type, characterized by the mineral combination 

 of piagioclase-augile-biotite with iron ore and a green chloritic or ser- 

 penlinoid mass, derived perhaps from olivine. One specimen (block) 

 contains phenocrysts of plagioclase, augite and ore, while the ground- 

 mass has an almost granophyric appearance and contains, besides 

 biolite, felspar and the green decomposition products just men- 

 tioned, a good deal of quartz and hornblende. Another slide shows a 

 light, placioclase-augile mass with the former mineral dominating, a 

 somewhat disintegrated diabase, but also dense dark fragmentary patches, 

 which consist chiefly of the flrst mentioned, characteristic minerals. 

 These rocks cannot be older than Jurassic, but it seems difficult to 

 group them together with the usually monotonous basalts; nor is there 

 any reason to class them with the syenite and monchiquite series 

 which have already been described. Perhaps they fall under the class 

 of the curious porphyrite rock from the interior of Hurry Intet (Fame 

 Islands). 

 'i but with large prominent plagioclase phenocrysts. 



XXVIII. 15 



