586 THE UPPER SILURIAN. 



IS S. 98° W. magnetic, the variation being 21° west. At the Acadia 

 Mine this course deviates about 33° from that of the containing rocks. 

 In other localities, however, the deviation is much smaller ; and in 

 general there is an approach to parallelism between the course of the 

 vein and that of the rock formation of the hills, as well as that of the 

 junction of the Carboniferous and Metamorphic systems. The vein, 

 for a space of seven miles along the hills, is always found at distances 

 of from 300 yards to one-third of a mile northward of the last Car- 

 boniferous beds, and always in the same band of slate and quartzite. 



Westward of the Acadia Mine the course of the vein over the high 

 ground is marked by the colour of the soil, as far as Cook's Brook, 

 about a mile distant. The outcrop of the ore was not exposed in this 

 brook, but large fragments of specular ore have been found in its bed, 

 and a shaft, sunk on the course of the vein, has penetrated more than 

 forty feet through yellow ochre containing a few rounded masses and 

 iiTegular layers of ankerite. At this point the decomposition of the 

 ankerite and spathic iron has extended to a much greater depth than 

 usual, and is so perfect that a specimen of the yellow ochre was found 

 to contain only "4 per cent, of the carbonates of lime and magnesia ; 

 the remainder being hydrous peroxide of iron, alumina, and silicious 

 matter. 



Still further west, in Martin Brook, I observed indications of the 

 continuation of the vein. Beyond this place I have not traced it ; 

 but I have received specimens of specular iron ore and ankerite from 

 the continuation of the same metamorphic district, as far west as the 

 Five Islands, twenty miles distant from Acadia Mine. 



On the east side of the west branch of the Great Village River, the 

 ground does not rise so rapidly as on the western bank, and the vein 

 is not so well exposed. On this side, however, a small quantity of 

 copper pyrites has been found in or near the vein, but it does not seem 

 to be of any importance. Indications of the vein can be seen on the 

 surface as far as the east branch of the river. In the east branch, red 

 and gray conglomerates, dipping to the south, and forming the base 

 of the Carboniferous system, are seen to rest unconformably on olive, 

 black, and brown slates, whose strike is S. 75° W. The continuation 

 of the iron vein was not observed in the bed of this stream. 



Further eastward, on the high ground between the Great Village 

 and Folly Rivers, indications of the ores of iron have been obsei"ved ; 

 especially near the latter river, where in two places small excavations 

 have exposed specular and red ores, and where numerous fragments 

 of brown hematite are found scattered on the surface. 



The ravine of the Folly River affords a good natural section of the 



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