214 



age of these rocks or about their relationship to some others in 

 the same district. But I think we may assume with great pro- 

 bability that they are connected in some way with the rocks 

 at С Parry and C. Fletcher, and, consequently, like the latter 

 are of paleozoic age. In any case it must have afforded some 

 interest to have given a somewhat more detailed account of 

 this curious group of rocks than has been offered before. It 

 was of interest to observe that it not only occurs in dikes, but 

 also in greater masses, and that like the rocks at Alnön, it 

 occurs in combination with limestone and, to a very great 

 extent, constitutes a true breccia. A more exact geological 

 examination of this district will undoubtedly lead to very in- 

 teresting results^). 



B. Tertiary Basalts. 



Around the NW. parts of the Atlantic basin, as has long 

 been known, a monotonous series of basaltic surface rocks 

 present themselves within an immense area. They have their 

 greatest distribution on Iceland, the 100,000 km^ of which 

 rest, as far as we know, throughout on these rocks. The Faroes, 

 too, though much smaller, are built up entirely of basalts. 

 Along the W. coast of Scotland and the N. coast of Ireland 

 we again find the same rock predominant in extensive tracts, 

 and if we go in the opposite direction it has already been 

 pointed out by Scoresby that within the most projecting and 

 accessible parts of E. Greenland basalt is almost the pre- 

 dominant rock in the coast-belt. 



The three first of these areas have been made known by 

 numerous researches, in the first place by James Geikie's 



') Professor A. G. Hogbom in Uppsala has most kindly placed at my 

 disposal, for purposes of comparison, the rich material of alnöitic and 

 nepheline-syenitic rocks which he collected from Sweden and elsewhere ; 

 moreover, he has examined and expressed an opinion about several of 

 the most interesting rocks described above. For this kindness I beg to 

 express to him in this place my warmest thanks. 



