No. 1.] GEOL. IAGTT. I NOED EOR EÆMUNDSJØEN. 41 



The porphyric gneiss is regarded as an altered granite by 

 most Norwegian geologists and as a sedimentary rock by our 

 Swedish brethren of the hammer. The figure on p. 12 illu- 

 strates the contact between porphyric gneiss and argillaceous 

 schists. The dotted lines show the parallel-structure of the 

 gneiss. 



The conglomerate-hills Brekkefjeld and Gjeitberget to the 

 North of the Feragen lake (map p. 5) are pictured on pag. 5 

 as seen from the West and from the South- East. The relation 

 of the conglomerate to the environing rocks is not obvious. 



The olivine rocks are (partly serpentinized) known by their 

 irregular patches of chromite which have been worked in small 

 mines, principally in the years 1850—70. The shaded low fore- 

 ground in the figure p. 9 shows a part of the largest olivine- 

 (serpentine-) rock-mass. In several places there are two well 

 defined varieties of the olivine rock, one rich in enstatite and 

 withering with redish brown surface, the other almost descitute 

 of enstatite and with a much paler yellowish surface. The two 

 varieties may be seen alternating with one anotber in rather 

 irregular and indistinct strata as shown in the figure of a rock 

 3 meters high at page 8. 



The dioritic rock is probably an altered gabbro, and the 

 green schistose rocks connected with it are partly diorite, which 

 has become schistose by pressure. 



Glacial drift covers much of the ground. It is remarkable, 

 that the blocks and the abrasion of the rocks show, that the 

 old ice-sheet has had a north-westerly movement from the 

 lower land in Sweden, and that it has overflowed even such a 

 high mountain as Sylene. Some peculiarities of the surface 

 of the till are figured on pages 15 and 17. On the first figure 

 is seen what may be a younger moraine lying upon an 

 older one, a. In the younger moraine near the end there 

 are some small crater-like hollows. The distance between the 

 two x in the figure is about 30 feet. Probably the hollows 

 have been filled with lumplike remains of the glaciers at the 

 melting-periocl of the ice. The second figure illustrates the 



