368 W. E. Logan on the Rocks of the Quebec Group. 
with a view of completely separating what is exposed to view, 
from what is inferred; and a plan reduced from this to one half, 
by photography, accompanies the present communication.’ The 
topographical as well as the geological features are delineated 
from the measurements of the Survey. 
seems to be the only hill between the Temperance Monument 
and Guay’s quarry. The South Ridge crosses the St. Joseph 
Church road about half a mile to the southeastward of the Mid- 
e 
as a base, are embedded masses of or compact limestone, of 
ter of an inch in diameter. The bands of conglomerate are 
se from one another by greenish and blackish slates, 
