Postglacial Submergence east of Georgian bay" — Taylor. 283 
hill at an altitude of about 1,215 feet. From the top of this last 
hill there is a wide view over the surrounding country and it 
could be seen that the flats at South River are continuous 
through to Stony lake, and they also extend a long way east- 
ward up the valley of South river. In that direction the hills 
bordering the flats appeared to be terraced at 50 or 60 feet 
above the flats, agreeing closely with the level of the shore line 
west of South River station. Half a mile north of the station are 
Dunbar's falls, where the river was diverted to one side of its 
former valley and thrown upon a rocky ledge. From this it falls 
more than 100 feet and has excavated a deep ravine towards 
the north. It is apparently certain that the whole sandy plain 
at South River is the surface of a great silt bed. At a point 
about three miles north of South River the railroad crosses a 
marsh about two miles wide. This is the top of the grade of 
the railroad, and its altitude on the profile is given as 1,202 
feet. The west side of the swamp is bounded by a great 
gravel ridge, which looked from the distance like a beach, but 
which, on close examination, proved to be a glacial moraine. 
Its summit rises about 80 or 90 feet above the marsh, is very 
uneven and covered with many pits and hollows. It has been 
excavated for ballast by the railroad, showing it to be com- 
posed of all grades of material from fine sand to large boul- 
ders. About half a mile north of the gravel pit the moraine 
slopes rapidly northward down into the deep ravine of South 
river, and looking from the edge there may be seen at a 
distance of three or four miles to the north a very conspicuous 
shelf which appears as a long horizontal line extending along 
the east side. This shelf is very close to the level of the 'beach 
at South River, and I have no doubt that it represents the 
highest line of submergence. It was near the mouth of the 
ravine and was exposed to the northwest over lake Nipissing. 
Trout Creek. The high terrace just mentioned must be 
close to the station of Trout Creek, probably within a mile or 
two to the south, but it did not appear to be accessible in the 
short time at our disposal. Our efforts to explore the vicin- 
ity of this place were rather unfortunate. We arrived only a 
little before dark and it began to rain immediately. We drove 
westward about two miles over a sandy plain to the bridge 
over South river, where we found a fresh excavation in the 
