and Birth of Lake Huron. 



17 



FIG 2. -MODERN BOULDER PAVEMENT ON GEORGIAN BAY, 



NEAR THE END OF BLUE MOUNTAINS OF COLLINGWOOD, ONT. 



r 



FIG. 3— ANCIENT BOULDER PAVEMENT OF AlGONOUIN BEACH. 



(whose crest rises 187 feet above Georgian Bay) upon the N. E. side of Blue Mountains of 



Collingwood, Ont. 



Am. Jour. Sci. 

 2 



-Third Series, Vol. XLI, No. 241.— January, 1891. 



