134 Macfarlane on the Primitive Formations 



nate to Hjaerdal. The lode, which occurs in a coarse grained 

 diorite, is sometimes of considerable thickness, and consists of 

 quartz well charged with purple copper. Here, too, the smelting 

 was unsuccessful, even more so than elsewhere in the district. 



The ore deposits near Horindbygden in the parish of Tin, are 

 described by Keilhau,* and are the following: I. Thatof Rodsoe 

 consists of a layer of quartz, containing partly massive and partly 

 disseminated copper glance. The thickness is about three feet, 

 the strike north and south, and the dip vertical. It is traceable 

 over a length of 200 feet. II. That of Daarudberge contains also 

 some copper glance in a quartz bed, two feet thick, but appears 

 less rich than that of Rodsoe. III. That of Vashoed is a quartz 

 layer of six inches thick, with a strike north and south, and con- 

 tains some purple copper. The adjacent rock is full of magnetic 

 iron ore, disseminated, and crystallized in very small octohedrons. 

 A deposit of iron ore has been described by Dahll,f as occur- 

 ring in Nissedal, between the farms Aarhuus and Sofdestad. It 

 appears to be a vein, and runs from north to south over the hill 

 called Grubeaasen. It dips 30° to 50° towards east, and has a 

 thickness of nine feet on an average. It is exposed for a distance 

 of 210 fathoms, between two small valleys. In the deepest por- 

 tion, it consists of magnetic iron ore, but on ascending the hill 

 from both sides, the magnetic ore becomes mixed with iron 

 glance, (specular iron ore); the quantity of which gradually in- 

 creases, .until, at the highest part, iron glance alone is present. The 

 surrounding slates are mica schist, containing a little hornblende, 

 hornblende schist and feldspar, and containing portions having 

 a granular structure. The vein is more distinctly separated from 

 the side rock, where it consists of magnetic ore, than when the iron 

 glance is present. The latter penetrates into the side rock, where 

 it replaces the feldspar. It is thus possible to find hand spe- 

 cimens consisting only of iron glance and hornblende. Quartz 

 and desraine are present in the vein. It is impossible to deter- 

 mine v/ith certainty the age of this deposit, but it is intersected 

 by granite veins. 



In concluding this description of the quartzose division of the 

 primitive slate formation, and of its economic minerals, as deve- 

 loped in Norway, I think that the following features may be 

 mentioned as characteristic of the group. I. The preponderauce 

 of quartzose rocks ; II. The presence of conglomerates of a pecu- 



* Geae Norvegica, p. 442. 



fOm Telemarken's Geologie, p. 31. 



