St. Maurice Expedition. ll 



Sumctimep from the total absence of mica and hornblende 

 the formation consisted of only two simple crystalline 

 minerals, quartz and felspar, occasionally containing large 

 masses of pure rock-crystal ; and in one or two instances 

 small portions of common magnetic iron ore. 



On the River Nawartnoo, above the falls of Kanowdy, 

 which lye some miles to the west of Rat River Post, the 

 rock parts with its hornblende for some distance, and the 

 place is supplied by small specks of black mica, and a 

 little shorl. On the east sliore of one of the lakes in this 

 neighborhood, there occurred some common magnetic 

 iron ore. 



At the upper end of one of the small lakes of the Coo- 

 coo-cash, communicating between the Rivers Vermilion 

 and St. Maurice, was a strong chalybeate spring running 

 through a bed of ferruginous clay, leaving a thick deposit 

 of oxide of iron This stream seems to pass under a bank 

 of gravel and coarse sand about thirty feet high, and two 

 hundred and fifty feet wide, dividing this lake from another. 



At Wemontachinque, and some other parts of the river, 

 the rocks frecpiently contain small embedded crystals of 

 i\cop red garnet ; and sometimes was observed a compound 

 rock of considerable extent, composed of common (piartz, 

 small crystals of flesh-red felspar, mica, hornblende and 

 minute crystals of garnet. On the north shore of lake 

 Malnwiii, we noticed crystals of iron glance and shorl 

 embedded in coarse granite ; these minerals we occasionally 

 met with on other i)arts of the route. 



About fifty miles above Lac du Sable on the River aux 

 I^ievres, i«i first seen a formation of calcareous spar. Tlii- 

 rock occurs in small rhomboidal cryslaU, closely aggre>, 

 gated, its external .structure nmcli resembling tabular spar. 



