St. Maurice Expedition. 13 



summit of the liill, about twenty feet above the water-mark, 

 was procured a specimen of what, at first, appeared to be 

 fluate of lime, but upon examination we have reason to 

 believe it to be azurite. Immense quantities of apatite 

 (phosphat of lime) was aggregated in veins, running 

 through the calcareous spar, which formed the dry chanuel 

 between the small sienitic hill and the main land. 



On the shores of tlie " Little Lake of White Fish," about 

 half a mile to the west of the post near Lac du Sable, and 

 also on the shore of the " Great Lake of White Fish," to 

 the southward of the post, were noticed large blocks of 

 calcareous spar, containing small portions of carburet of 

 iron. In one block, from which a specimen was procured, 

 were found crystals of epidote. The portages leading to 

 these lakes ran over hills of sieuite. 



At the foot of the Mill Fortage, three or four miles 

 above the Ottawa, the rock consists of red felspar, of an 

 earthy appearance, with quartz and specks of serpentine. 

 Overlying ibis rock is a broad vein of calcareous spar 

 containing some carburet of iron. 



Ill tin- vallies lying between the broken ranges of hills, 

 are found deposits of silecious sand to great depths ; but on 

 the lops of those hills the covering of sand is scanty. — 

 Where the beds of calcareous spar occur in the vallies, u 

 ditU-rent species of timber is generally found, from that 

 covering the sides and summits of the adjacent mountaius. 

 In no instance, except near the (jabelle Ra])ids on ihe south 

 «ide of the River St. Maurice, was seen the slightest trace of 

 fossil organic remains ; nor could the closest scrutiny dis- 

 cover among tlic sand, any fragnients of shells; but in all 

 the lakes were al>undance of the genus mya. 



The vu»t cluiiu of lakes found on the lands height, uiid 



