272 THE CANADIAN NATURALIST. [Aug. 



impregnating sulphurets are distinctly recognisable; the breadth 

 is sometimes over 200 feet; the length on the strike is consider- 

 able; (one mile at least), the strike is the same as that of the 

 enclosing rocks, and the fahlband itself is a micaceous gneiss. 

 Depressions on its course are frequent, and it would seem to 

 occupy the low cultivated land which lies behind John Robb's 

 house. The only particular wherein it differs from the same rock 

 in Norway is in being accompanied on the east side by a band of 

 crystalline limestone, which often weathers brown and is much 

 decomposed, and in being, so fir as explorations have heretofore 

 shown, destitute of any valuable minerals. Its true character 

 being now known, however, it is possible that future exploration, 

 if concentrated upon this zone of rock, may develope some metal- 

 liferous deposits of value. 



On the east side of Indian River, and near the town-line between 

 Rossie and Antwerp, another fahlband occurs, this time unaccom- 

 panied by crystalline limestone, containing traces of copper-ore, 

 and therefore presenting a complete analogy with the fahlbands of 

 Norway. This fahlband is found on the land of Mr. Lyon 

 in Antwerp, close to the road which, towards the north, joins the 

 plank-road between Clarkshill and Oxbow. Owing to the decom- 

 posed state of the rock of this fahlband, it is difficult to recognise 

 its mineralogical constituents ; but it is more micaceous in character 

 than the one on John Robb's farm. Its strike when first observed 

 was N. 37° E, the strata being as usual almost vertical. A few 

 fathoms distant from it, on the eastern side, some exploration had 

 been done, and pieces of copper-ore said to have been discovered. 

 In the excavation itself I could discover no trace of copper ; but 

 lying among the debris from it pieces seemingly of pyrites very 

 much decomposed were observed, which, on assay, were found to 

 contain 4.6 per cent of copper. The rock in this excavation was 

 altogether different from that of the fahlband, and much resembled 

 the diorite described among the rocks of the district. A short 

 distance from this place, towards the north on the fahlband, a 

 small vein ( J to f inch wide) occurs crossing it at right angles 

 nearly, and containing almost pure copper pyrites. A small quan- 

 tity picked out of the vein assayed 25.4 per cent copper. Follow- 

 ing the fahlband to the northward, it continues on the east side of 

 the road, changing its strike to N. 31° E. (dip to N. W., h9°), 

 then to N. 50 E, when it diverges further from the road. A few 

 hundred yards to the eastward of the road a three-feet vein of 



