410 



DESCRIPTION OF THE COUNTRY 



BORDERING 



The slates on the northwest side of it, appear to be overlaid for some distance by 

 trap, and some of the beds are changed to a compact hornblendic-looking rock. 

 The portage is five hundred and ten paces long. 



b a d c 



a. Greenstone, b. Slate, c. Metamorphosed slates. </. Slates with breccia. 



The third portage of Pigeon River is six hundred and thirty paces long, and 

 passes over a very low ridge, formed by a greenstone dike traversing clay slate. 

 There are forty-eight feet of clay slate here, a portion of which, in proximity with 

 the dike, resembles slaty hornblende. 



The fourth portage is seven hundred and fifty paces long, and is made to avoid 

 a rapid, in which no rock in situ was seen, nor is any exposed in the low ridge over 

 which this portage passes. Between the third and fifth portages there are no rock 

 exposures ; both sides of the river being bordered by extensive swamps, which ex- 

 tend back to high greenstone ridges on the American side. 



The fifth portage is two thousand two hundred paces long, and passes over low 

 ridges, composed of clay slate, somewhat altered at some places, and highly meta- 

 morphosed at others. Toward the upper end the slate is overlaid by greenstone, 

 and occasional large fragments of slate are seen enveloped in the trap, which appear 

 as though they had been partially fused. 



ESCARPMENT 01" SLATE, LAC D V C 0 C>. 



At the lower end of Lac du Coq, where this portage terminates, the rocks are 

 clay slate with hornblendic beds, overlaid by greenstone. The outlet of the lake is 

 between high vertical walls. The summit of the precipice on the Canada side is 

 three hundred and six feet above the lake-level, with a wide talus, one hundred 

 feet in height at the base ; on the American side the escarpment rises from the 

 water to the height of ninety feet. The range here is composed of a number of 



