Postglacial Submergence east of Georgian bay. — Taylor. 285 
The highest shore line was found on the hills north of North 
Bay at an altitude of about 1,140 feet above the sea level, and 
again eight miles east of Cartier on the Canadian Pacific rail- 
way at about 1,200 feet. 
Summary and Conclusions. 
The altitudes of the beaches observed are summarized in the 
following table. The measurements were all made by aneroid 
from points of known altitude near by. The letter r stands 
for beach ridge and the letter t for terrace. 
Barrie r 780 
Lome villr /• 815 
Orillia t 830 
Midland t 820 
Graven hurst r 825-f- '.' 
Bracebridge r it?.') 
Huntsville t 1)000 
Bnrk'sFalls (Spencer) 1.171 ? 
Sundridge r 1,205 
South River t 1,220 
Trout Creek t 1,145+ ? 
North Bay (at Nelson's) r 1,140 
Cartier t 1,200 
The facts show clearly that the same water that filled the 
ancient channels in the southern highlands extended far to 
the north and west. It evidently covered all the lowlands of 
this region and, as indicated by the altitude of the shore lino, 
made a strait over lake Nipissing at least 25 miles wide and 
500 feet deep, and probably another farther north over the 
hight of land to Hudson bay. There is also much reason for 
supposing its extension down the Ottawa valley to the lower 
plains of Ontario and the area of well established marine sub- 
mergence. But it seems probable that the highest shore line 
has not yet been recognized in those parts. I am, therefore, 
much more confident of the truth of a statement made in ;i 
previous paper,* that the upper beach of the Nipissing region 
is one with the Iroquois beach of the Ontario basin. The coun- 
try through which the connecting link probably passes is ex- 
tremely rough and the difficulties of exploration will be great, 
but probabl} 1 - not greater than those of some other regions 
where good results have rewarded persevering explorers. 
*"The Highesl old Shore Line on Mackinac Island," Am. Jour. Sci., 
III. vol. m.im. pp. 210-218, March. 1892. 
