TORONTO GLACIAL AND INTER-GLACIAL DEPOSITS. 633 
forming the upper plateau at Scarboro’, the two being separated 
only by the deep bay-like depression of the Don Waulllesy 2 ayavel ite 
seemed to me probable, last year, that the layer of till overlying 
the shale at the brickyard was a continuation of the lower Scar- 
boro’ till, which sinks beneath Lake Ontario near Victoria Park 
three or four miles to the east. This implied that the fossilifer- 
ous beds at the Don, with the overlying stratified clay in which 
no fossils occur, were equivalent to the upper, unfossiliferous 
beds at Scarboro’. This spring, however, new excavations at the 
brickyard have completely overturned this theory by disclosing 
a thick bed of till in the slope formerly covered with grass. This 
overlies the fossil-bearing strata which correspond, therefore, to 
to the lower, fossiliferous bed at Scarboro’, so far as position is 
concerned. 
At present the quarry presents the following section, as meas- 
ured by aneroid and steel tape: 
Feet. 
Soil and stratified clay, making buff brick (unfossiliferous) 43 
Till (partly covered with grass) about - - - 35 
Stratified clay with peaty matter, making red brick - 13 
Stratified sand with some clayey beds (fossiliferous) - 24 
Till - - - - - : - 2 
Hudson River shales, about - - - - 60 
The Hudson River shales rise about thirty-five feet above the 
level of Lake Ontario. At the Don Valley brickworks we have, 
then, a lowest till resting on the rock and overlaid with fossilif- 
erous beds; a second till corresponding to the lower Scarboro’ 
till; but no uppermost till, though one probably existed before 
the formation of the Iroquois beach, and the upper stratified clay 
passes beneath the upper till at the Davenport ridge a half-mile 
away. So far as I have observed the three tills are nowhere all 
disclosed in a single section ; but a shaft sunk through the Daven- 
port ridge or the highest part of the Scarboro’ Heights would 
probably cut through all three. 
Since the paper on the Don fossils was published three new 
localities have been found in the same valley; one of them, 
which was opened to give employment to the convicts at the gaol 
