206 



J. W. Spencer — High Level Shores of the 



of them are cut out of the third series of till, which covers 

 ridges and plains of much of the highlands of Ontario. The 

 highlands of the peninsula then rose up as a growing island 

 out of the receding Warren Water. 



The position and relative heights of the beaches of the two 

 sides of the St. Clair Hiver are seen in the following section, 



which represents a profile across them along a nearly east and 

 west line. Making allowance for the terrestrial deformation 

 between the beaches themselves, it will be readily seen that 

 there is only a slightly greater amount of rise between mem- 

 bers of the series upon the eastern side than upon the 

 western, and this is in harmony with all the observations else- 

 where about the lakes. Hence, I have been forced to accept 

 the identity of the two sets on the opposite sides of the St. 

 Clair River, as there are no important intervening shore-mark- 

 ings, on the plains between the named ridges, although those 

 upon the western side are more sandy than on the eastern. 



The Forest Beach skirts the plains at the head of Saginaw 

 Bay and passes around the thumb of Michigan. About five 

 miles west of 



Feet above the Sea. 



Port Huron, it is duny with an elevation of_ _ 665 



East of Berville 668 



Sylvania 663 



East of Defiance (Gilbert) _ 653 



Cleveland 673 (bar.) 



Madison 680 



Sheridan Centre, N. Y., (Gilbert) 773 



Crittenden, K Y., (Gilbert) 860 



The Arkona Beach has an elevation of — near 



Goodall 697 



Denton 694 



Blissfield (ridge duny) 694 



Cleveland 1 _ _ 708 



A record of this shore line is more meagre than the last. 

 Both of these beaches have been more or less surveyed in Ohio 

 by the late Geological Survey of that State," and Mr. G. K. 

 Gilbert has measured the continuation of the lower for some 

 distance beyond the State line, into JSTew York. The Lower, 



* Geology of Ohio, vol. i, map, p. 549. 



