276 The American Geologist. November, 1894 
three places, and the terrace itself is flanked below by a very 
marked boulder pavement. We ascended the hill to an alti- 
tude of about 150 feet above the beach, but saw no further 
evidences of submergence. Marks of submergence are also 
plain for two or three miles east of Midland. The small lake 
which lies south of the road, and which has its outlet south- 
ward and then northward by a circuitous route, was probably 
cut off from its former direct connection with Georgian bay by 
shore drift when the water was at a higher level. 
Many impressive evidences of submergence were seen on a 
drive from Midland to the town of Penetanguishene, which is 
at the head of another bay about ten miles farther west. In 
the edge of Midland the road passes through a tract that is 
covered by an enormous quantity of large boulders, mostly 
erratics of northern origin, which must have been carried by 
the ice-sheet across a part of Georgian bay. Half a mile or 
more beyond this there begins a series of terraces which ex- 
tend two or three miles along the northwest face of the hill. 
They are situated upon a very steep slope and are narrow, but 
they are strongly and clearly formed. At one place there are 
five of these terraces arranged like steps on the steep hillside. 
The lower one is much wider than the rest, and is, in fact, a 
narrow sandy plain. The upper terraces are composed mainly 
of pretty coarse material. Farther on, the hill east of Pene- 
tanguishene rises about to the level of the shore line observed 
south of Midland, but we did not succeed in finding the beach 
on the south slope, which was the only side we examined. 
From the upper edge of the town looking toward the south- 
west we could see a distinct mark along the face of a high hill 
about two miles away. This mark appeared to be a terrace 
and is not far from the level of the beach at Midland. 
Thus far all the observations made were within a field for- 
merly explored by Dr. Spencer, although he does not mention 
observations at any of the points here described. 
Parry Sound. From Midland we went to Parry Sound by 
steamer through the wonderful archipelago which lines the 
coast of the Georgian bay. The smaller, outer islands are 
mostly bare, but the larger islands are in some places covered 
with the coarser kinds of sediments. Hardly anything was 
