ines of that region, which are now so extensively wrought. 
* * * * * * 
investigations, but it occurs also on the north shore, where it h x 
€n traced for a considerable distance along several rivers whi 
empty into the lake. It was observed, however, by Mr. Whit- 
tlesey, that to the northwest of Lake Superior the drift assumes 
an ash-colored tint, which is owing, no doubt, to the absence of 
ted sandstone in these regions. 
limited to a certain height, where it is followed by the drift sand, 
t0 be observed, however, that, on the whole, it seems to be lim- 
ited merely to the depressions of the soil, and never to cover the 
culminating points. 
; vets the clay deposit in 
has been obs el bes also extends over many 
8 Not reach, 
ee was generally limited to the depressions. 
na gravel have no such limitations. — 
~ SS and along the sle he hills, as well 
it 
~ 
