low ] GEOLOGICAL OBSERVATIONS. 33 D 



As before mentioned, on the Betsiamites River, at intervals along 

 its shores, as far as the first fall, beds of blue clay were seen overlaid 

 by sand. In places the exposures of these showed a thickness of 

 thirty feet of clay, and the beds were greatly crumpled and folded. 



The surrounding country here is too low to afford good illustrations 

 of terraces and none were seen. Beyond the first fall, and as far as 

 Lake Mistassini, the banks of the rivers and lakes passed are low, and 

 no good cuttings in the drift were seen. 



Three miles to the north of the Hudson Bay post on Lake Mistassini, 

 is a sand-bank forty feet high, without signs of stratification, and con- 

 taining quantities of coarse gravel. Similar exposures were also seen 

 near the Big Narrows. 



On the Rupert River, nothing but sand was seen until the Oatmeal 

 Fall was passed. Below this, the river banks are cut out of a blue 

 clay, showing stratification and overlaid by sand. These clays often 

 show in exposures a thickness of thirty feet, and are very free from 

 boulders. 



