low.] GEOLOGICAL OBSERVATIONS. 29 I> 



a mile, to a point immediately below Taint Mountain, which rises 

 above the lake, in a short distance back, to a height of 250 feet. 

 In one place, there is a depression running up the mountain from 

 the lake, thirty feet wide, filled with drift. The sti'ike of this depression 

 is S. 61° W. and N. 61° E. On Sorcerer- Mountain, which rises, on 

 the south-east, to a height of 42.") fed above the lake, the rock is green 

 chloritic slate,with small specks of iron pyrites disseminated irregularly 

 through it. In the narrows of the north-east end of the lake, the rock 

 is a conglomerate and breccia. In some parts, it is made up of small 

 fragments of the rocks already described ; consisting of yellowish 

 feldspar and quartz, green chlorite, serpentine, and epidote; while 

 in others, the pieces are from a lew ounces to one hundred pounds in 

 weight. Large expanses of conglomerate are likewise entirely com- Co: 

 posed of rounded fragments of Laurentian gneiss of grey and red 

 colors, the latter predominating. Other exposures show a conglom- 

 erate made up of angular and rounded fragments from an ounce to 

 a ton weight, in a matrix of tine material of the same kind. These 

 conglomerate- are succeeded by serpentines and associated rocks, which 

 make their appearance immediately to the west of the first portage 

 leading from the lake. About 200 yards west of the portage-road, 

 a cone-shaped hill, which rises over the waters of the narrows about 

 one hundred and sixty feet, is entirely composed of serpentine. This 

 rock is traced, on one side, to the portage, and on the other it is 

 supposed to form part of Juggler's Mountain, which is about 400 feci 

 high, and is about two miles distant, bearing S. 41° W. On the 

 highest part of the cone referred to there is a blackish limestone, 

 about one foot thick-, interst ratified with serpentine. Dr. Hunt, 

 while examining these rocks, had a portion of the limestone sliced 

 for examination under the microscope, which revealed a structure 

 resembling that of some coral. The serpentines, which are dark 

 colored, opaque, and contain much disseminated magnetic iron, yield 

 by analysis considerable portions of chrome and traces of nickel. 

 On an island opposite the portage, the rock is blackish-blue hard 

 slate, rarely with what appear to be small grains of whitish feldspar. 

 On the various portages and small lakes passed over from this 

 point to Lake Wakinitche, the only rock seen is chloritic slate. 

 The same remark applies also to the lake itself, from its south-west 

 end, along the south-east side, to within six miles of its outlet. In this 

 last distance, and for a mile beyond the outlet, only conglomerate rocks 

 are seen. Thrse resemble the two varieties already described. On 

 the north-west side of the lake, about the middle, these rocks rise to a 

 height of 150 or 200 feet, forming a bare escarpment, extending for 

 about four miles; and, on the same side, near the outlet, Wakinitche 



