Great Zakes, and their Deformation. 205 



ponding to the frontal plains of still higher deserted coast-lines. 

 Indeed, in the fragments seen, several other still high coast- 

 lines are recorded. The altitudes of several of these are here 

 given, and those marked with an asterisk are in topographical 

 positions that would permit of their identity with the Ridge- 

 way Beach, which has not however been continuously traced 

 between all the points. 



Feet above the Sea. 



Seven miles south of London *882 



" " " 872 



" " " 862 



Near Ingersoll *924 



" 911 . 



" (terrace) '. _ _ . 903 



Corwhin (rock-cut terrace with gravel floor)*! 127 

 Acton (rock-cut terrace with gravel floor) __*1160 



Near Mono Mills (rock-terrace) 1 400 (bar.) 



" " (gravel terrace) 1 375 (bar.) 



" " (terrace) ] 200 (bar.) 



West of Collingwood (rock-terrace) _ 1400 (bar.) 



West of Clarksburg (beach) . 1396 



" " (beach) ... 1372 



" " (rock-terrace) __ _ 1262 



« « " 1225 



Duncan (rock-terrace) . 1260 (bar.) 



N. E. of Flesherton (terrace with gravel 



floors) 1430 (bar.) 



Dundalk . 1690 



Proton (plains) 1613 



South of Markclale (terrace) 1425 (bar.) 



" " 1400 (bar.) 



Markdale Station (terrace) _ 1360 



2 miles north of Berkley (gravel spit) 1260 (bar.) 



Arnott (terrace) 1067 



The beach remnant, in the region of Dundalk, is only twenty 

 feet below the highest point of land, which once formed a 

 small island. From this point down to sea-level, there is 

 abundant proof, in the beaches, spits, sea-cliffs, and cut terraces 

 that there was a long succession of intermittent episodes of 

 subsiding waters from the highest lands of the peninsula of 

 Ontario — lands often higher than the highlands north of the 

 Great Lakes, which now constitute the Lauren tian Mountains 

 —care having been taken to distinguish these named structures 

 from those gravel deposits belonging to the older drift episodes. 

 Even after allowing for the amount of more recent terrestrial 

 warping, these higher shores of Ontario rise far above much of 

 the land to the south of the lakes. All of the deserted water- 

 margins are more recent than the drift deposits, and some 



