Vol. 52.] SPECIMENS COLLECTED IN ARCTIC NORWAY, ETC. 741 



I compare the glacial effects of a continental ice-sheet as we find it 

 now in Greenland, or as it formerly existed over a large portion of 

 Europe and North America, with glacio-marine action; but un- 

 doubtedly the latter has been and still is a not unimportant factor 

 in glacial geology. 



In conclusion, I beg to thank Prof. Bonney for his kindness in 

 adding two valuable appendices to this and my former paper. His 

 examination and description of these rocks, some of them from 

 remote and inaccessible localities, are valuable in themselves ; but 

 I am most grateful for the light which they throw on the origin 

 of some of the erratics that I have met with. 



There can be no doubt that many of the erratics found in the 

 glacio-marine beds of Kolguev are of precisely the same lithological 

 character as rocks found in place in jNovaya Zemlya, and we may 

 presume with great confidence that they were carried thence by 

 floating ice and dropped to the bottom in that part of Barents Sea 

 which has now risen into dry land. Again, it is extremely inter- 

 esting to find, from Prof. Bonney's investigation, that the vast 

 accumulations of boulders on the Kola Peninsula are derived from 

 local rocks, without, so far as we know, any foreign admixture. 



Appendix. 



Report on Specimens collected by Col. H. W. Feilden in Arctic 

 Norway, etc. By Prof. T. G. Bonney, D.Sc, LL.D., F.R.S., 

 Y.P.G.S. 



In the following notes the specimens collected by Col. Feilden 

 arc grouped according to localities and arranged iu the order of the 

 dates on the labels. 1 



(i) From Rock in place, Stor Tamso, Porsanger Fiord, Norway. 



(28.) A fine-grained, faintly speckled, light grey rock, apparently 

 either a quartzose gneiss or quartz-schist, without strongly marked 

 foliation. On examining a slice, quartz proves to be the dominant 

 mineral. It occurs in rather elongated irregularly-outlined grains, 

 with borders of a different tint (with crossed nicols). A dark 

 olive-brown biotite is present in both fair-sized flakes and tiny 

 flakelots, with some felspar, but much less than one would expect 

 from the macroscopic aspect of the rock ; there are also a few 

 small garnets, a little iron-oxide, and zircon. Macroscopically and 

 microscopically the rock reminds me of some quartz-schists which 

 I have collected near Braeraar, Aberdeenshire, and in the neighbour- 

 hood of Clifden, Connemara. 



1 The numbers are those affixed to the specimens by Col. Feilden. Sections 

 were prepared for the microscope in cases where the rock seemed likely to be 

 specially interesting. In other cases a fragment was powdered, and the 



material was mounted on a slide and examined. 



