

tow.] JAMEs' BAT. 59 .7 



ridge to mark the height of the old deposits. Along the valley of 

 Wiachtiwan River, above the portage, terraces with laces cut out of 

 stratified sand and clay are quite common, especially on the upper 

 part. On the portage from the river valley, the first terrace is thirty 

 feet above the river, the second, one hundred and sixty feet, and the 

 third, a broad plain on the upper level, three hundred and ten feet, or 

 six hundred and seventy-five feet above sea level. 



The deposits out of which these are formed consist of stratified 

 sands, with fine gravel on the top plain. Although no fossils were 

 found in these beds, they are probably of estuarine origin and mark 

 the amount of elevation of the land since the period of submergence 

 subsequent to the period of glaciation. 



Beyond this point, as far as Clearwater Lake, no stratified surface 

 deposits were noted. The loose material is wholly made up of boulder 

 till. The boulders are scattered over hill and valley in the utmost, 



_.„ „ . l^istriburii.n ••( 



profusion. Often large rounded masses of rock of many tons weight boulders, 

 were seen perched on the very summits of the hills and held in place 

 by smaller boulders wedged underneath. In one place a boulder, over 

 three feet in diameter, was seen perched upon another of twice the 

 size. These boulders all appear to be derived from the immediate 

 country rock and have not travelled far from their original place. The 

 only example of a far-travelled erratic seen was a small boulder of 

 white fossiliferous limestone, similar to that found in Hudson Straits 

 and on the west side of Hudson Bay. This was found on the top of a 

 hill two hundred feet above the outlet of Clearwater Lake. As the 

 drift was here directly from the east, and as Low flat land is reported 

 by the Indians to occur about Seal Lake in that direction, it is highly 

 probable that deposits of similar rock will be found in that neighbour- 

 hood, the boulder being carried from there by the ice. 



At the lower end of the portage, from the mouth of the Wiachtiwan Manur.niuick 

 River, is a small exposure of light green felspathic argillite, belonging r " ck "'' 

 to the Manitounuck group of Dr. Bell (sec Report of Progress 1877-78.) 

 Along the hillside, on the upper part of the portage, a cliff of the 

 same rocks dip N. 60° E. < 85°. and gives the following section in 

 ascending order : 



(1.) Apple green siliciou> argillite, fifty feet. 



(2.) Light yellowish grey sandstone, six feet. 



(3.) Light grey crystalline limestone mixed with grains of quartz 

 and shading into sandstone, with a calcite matrix, very hard and 

 tough, thirt}--five feet. 



(4.) Bedded dark green amygdaloidal trap, one hundred feet. 



Between this exposure and Clearwater Lake Archean gneisses only, 

 were seen. 



