APRIL, 1900. BRUNCKEN— PHYSIOGRAPHICAL NOTES. 
99- 
the quarry. Tracing this Hue one notices first of all that the sur- 
face strata are very sound. There is hardly a trace of weathering, 
no layer of "rotten" stone. Furthermore, the line is very even, 
forming a low, vertical curve, highest in the center and descend- 
ing gently to north and south. The bedrock, therefore, seems to 
have formed in this place a low dome, worn smooth on its surface, 
in other words, a huge roche inoutonnee. On the top of this the 
boulder clay was deposited. There is nothing to indicate, in the 
present condition of the exposure, whether the abrasion of the 
surface took place during an earlier stage of the same glacial in- 
vasion which deposited the Till, or had been completed before the 
last invasion began. It is generally admitted that the Till of this 
neighborhood, in its present arrangement, belongs to the youngest 
or Wisconsin epoch of the ice age. If more of the surface of this 
roche inoutonnee should be uncovered, an examination should be 
made to ascertain whether any weathering had taken place. If 
none at all could be found, it would indicate that there was no 
interval of exposure between the abrasion and the deposit of Till. 
If there has been weathering, the amount of it may throw some 
light on the mooted question of the length of time elapsing be- 
tween the successive glacial deposits. 
The existence of the roche inoutonnee at Story's quarry sug- 
gests that the peculiar configuration of the cliff at the Soldiers' 
Home is caused by its being the somewhat irregular edge of a 
similar ice-worn dome. As to whether the existence of the kame- 
like group of hillocks at this place has a causal connection with the 
surface configuration of the bedrock, I am not able to form an 
opinion. 
