

i I B] I wo squill K\-l URHITORY, 





Many boulders of a conglomerate were Been Btrewn along the Bhoxi 

 I the lake, having a matrix of crystalline limestone, holding gneiss 

 pebbles. No rock exposures were observed along the Pipmuakin 

 River, although near the poinl where the portage route leaves it for 

 tin- Man, .nan River, loose angular blocks of a white crystalline lime- 

 stone arc scattered over the surface, and evidently not much travelled. 



' >n the third and fourth lake- of the Manouan portage, the ordinary 



■ and grey gneisses, composed of quartz, hornblende and orthoclase 

 were Been, having a dip S. 60 W. TO , 



The next exposure occur- on the Man,, nan River, a short distance 

 above the poinl where we entered it. The rock here -ecu was a dark 

 green homblendic gneiss, bolding considerable quantities of magnetic 

 iron. hips. 60 E. 7" , Exposures of similar gneiss occur along 

 the river as far as the portage to Lake Manouan. In these the darker 

 varieties, containing large proportions oi hornblende, predominate, 

 and the greater Dumber shoM Bigns ol magnetite present. 



On the fifth lake of the Lake Manouan portage route, a greyish- 

 green crystalline limestone, containing large crystals of mica and 

 orn blende, was ton ml interstratified with the red gneiss. Some of the 

 mica crystals found on the surface were >ix by lour inches in diameter. 

 and quite fit for purposes of commerce. The limestones were -ecu al 

 intervals along the route for a distance of three miles. Beyond this, 



no exposures occur until Lake Manouan is rcaclie 1. 



On the north Bide of the lake, three exposures of dark grey hom- 

 blendic gneiss were Been, having a dip N. 10° B. 60 . At the first 



lake on the portage route from Lake Manouan to the lVrihoiika Liver 



an outcrop of red fine-grained gneiss occurs. Dip S. 30 W. U)°. 



Nothing further was seen until the inlet of Lake Onistagan, on the 

 Peribonka Liver, was reached, the lock here being dark grey horn- 

 blende-gneiss. Fifteen miles farther up the river is coarse-grained 

 red and grey gneiss, containing a large proportion of quartz. Strike 

 N. 30 W. At cad, of the small rapids beyond this point, lighl 

 gneiss, composed chiefly of quartz and hornblende, with small quantities 

 of orthoclase, was -ecu. 



Prom the Peribonka River to Lake Mistassini, bul fow exposures 

 were observed, as the country at the time we traversed it was covered 

 with snow, which probably hid some of the tew outcrops occurring. 



The last exposure of gneiss was Been at the Crooked Lake, on the 

 Temiscamie River, beyond the Eeighl of Land; the next exp 

 being Cambrian limestone, on Lake Mistassinis, bo that the junction of 

 the two formations lies between these points. 



To tic westward, on the Ashouapmouchouan and Mistassini Liver-. 

 Bimilar Larentian rocks extend all the wa\ from Lake St. John to the 



