TORONTO GLACIAL AND INTER-GLACIAL DEPOSITS. 639 
distances both at Scarboro’ and along the Don, but by no means 
always in the sense of thinning out towards the west. For 
instance, the middle till, the lowest visible at Scarboro’, is there 
generally less than thirty feet thick and for a mile or more 
scarcely averages five feet inthickness; but at the Dutch Church, 
where the subglacial débris has been crowded into a deep valley, 
it reaches a maximum of seventy feet. The same bed of till at 
the Don brickworks is thirty-five feet thick, and a little farther 
south, between the Winchester street bridge and Danforth avenue, 
is apparently ninety feet thick. 
The upper till at Scarboro’, so far as I have measured it, runs 
from twenty to thirty feet in thickness; but at Moore Park Sta- 
tion, less than a mile north of Taylor’s brickyard it is forty-five 
feet thick, and at York Mills, three or four miles northwest, is 
nearly sixty feet in thickness. 
In reality the difference in thickness of the drift at Scarboro’ 
and the Don is due rather to the greater or less development of 
the inter-glacial beds than to the thickness of the till. 
If these inter-glacial deposits were formed during slight oscil- 
lation of the ice margin, one would suppose that drifting ice 
floes or even bergs would have been active on the waters of the 
time, transporting bowlders and other materials, which should 
be imbedded in the clays and sands of the lake bottom; but 
neither Dr. Hinde nor the present writer has been able to find 
stones of any kind in the 140 feet of fossiliferous beds at 
Scarboro’. 
The case of the Alaskan glaciers cited in the article men- 
tioned’ is in reality not at all analogous to the conditions pre- 
vailing at Toronto during the earlier inter-glacial time. In Alaska 
the Japan current brings comparatively warm moist air right up to 
latitude 60°; while the highest mountains in North America rise 
a few miles inland, their icy flanks intercepting the moisture- 
laden winds from the Pacific and causing a tremendous snowfall 
in a region where the snowline is only 2000 feet above sea level. 
If Mt. Fairweather, Mt. St. Elias and Mt. Logan were leveled, 
‘Ibid., p. 278. 
