o7 [Jackson. 



9. Mica Slate rock extending to the eastward to a distance 

 unknown, but very far. 



NORTH MOUNTAIN. 



On the North Mountain, which is separated from the South Moun- 

 tain by a branch of Westfield River, we find three large beds of rich 

 magnetic iron ore, six feet wide, included in Chlorite slate rocks ; and 

 a bed of more largely crystalline emery, some of it approaching 

 corundum in its structure and purity, and having a red brown color, 

 instead of the usual bluish tint of emery. 



This bed is seen in raised ridges where ancient glacial or drift action 

 has worn away the softer materials of the rock, and left it exposed ; 

 and, strange as it may appear, this — one of the hardest minerals 

 known — has been smoothed and polished by the agency of drift 

 grinding. 



I present to the Society a surface specimen thus poHshed by drift 

 action. 



The principal bed of emery on this mountain is seven feet in thick- 

 ness, and the emery is more free from oxide of iron than it is on the 

 South Mountain, but still it is quite strongly magnetic, and contains 

 protoxide of iron and oxide of titanium. 



A section of this mountain is as follows, beginning at the right or 

 lower rocks, and proceeding upwards. 



1. Plornblende rock. 



2. Magnetic iron ore. 



3. Emery, seven, feet. 



4. Hornblende rock. 



5. Chlorite slate. 



6. Magnetic iron ore, six feet. 



7. Talcose slate. 



8. Magnetic iron ore, six feet. 



9. IMica slate. 



It is probable that all three of these beds of iron ore will be found 

 on the South Mountain ; for they run directly towards it, and it is not 

 far distant. The soil, at present, prevents their being seen if they are 

 there, and I doubt not they will be found by proper search by cos- 

 teaning, or digging down to the rocks across the Hue of the beds as 

 indicated by those of the North Mountain. 



It is evident, however, that in the discovered beds we have iron ore 

 enough to use for a century to come, but it will be convenient to 

 mine the ore on the side of the South Mountain also. 



