300 THE CANADIAN NATURALIST. [Vol. X. 



Guelph formatioD, on which the o-reater part of it lies except 

 towards the southern extremity, where the Niagara formation is 

 largely represented. Pebbles of Laurentian and Huronian rocks 

 are everywhere mixed with the others and sometimes form a con- 

 siderable proportion, while rounded fragments from the harder 

 beds of the Hudson river formation occur locally in some abun- 

 dance." (Note — These last rocks are obtained from lower levels.) 

 " The gravel is all well rounded and generally coarse. It often 

 constitutes what might properly be called cobble stones, being 

 loose and free from any admixture of clay, and it is distinctly 

 stratitied. Well-worn boulders of Guelph, Laurentian and Hu- 

 ronian rocks are disseminated through the whole mass. At 

 Brantford and Mount Forest (?) it overlies blue Erie clay." 



• 



TABLE OF ELEVATIONS OF TERRACES, BEACHES AND RIDGES. 



The following elevations of terraces and beaches are here tab- 

 ulated w^ith reference to elevation above mean tide. This, how- 

 ever, can only be approximately done as none of the series is 

 complete. Some of the elevations refer to the highest exposures 

 and others to pits cut into the gravels: — 



References of tahle on opposite page. 



a On high lands of Michigan. 



b Summit of land. 



c Beach also of this elevation 

 on Mackinac island. 



d Adjacent to St. David's valley. 



e Along \V. G. and Bruce railway. 



/ Along Whitby branch of Mid- 

 land railway. 



(/ Along Midland railway. 



h Along T. G. & B. railway. 



