[parks] presidential ADDRESS 29 



WILLIAMS' CLASSIFICATION OF THE SILURIAN OF ONTARIO— Con/'rf 



Niagara Group 

 Lockport 



Eramosa beds 



Dolomite 



Gasport 



Rochester Rochester shale 



Clinton Irondequoit dolomite 



Williamson (?) shale 

 Reynales (Wolcott) dolomite 

 Furnaceville (?) (Sodus) shale 



Medina-Cataract 



Thorold sandstone 

 Grimsby sandstone 

 Cabot Head shale 

 Manitoulin beds 

 Whirlpool sandstone 



Raymond, in 1912, subdivided the Trenton of Ontario as follows: 



4. Hormotoma zone 

 3. Prasopora zone 

 2. Crinoid zone 

 1. Dalmanella zone 



He is also responsible for dividing the strata previously known as 

 "Utica" into a lower series, the "CoUingwood" and an upper "Utica." 



In addition to these more important individual works we have 

 evidence of a revived interest in stratigraphy in Foerste's "Upper 

 Ordovician of Ontario and Quebec," Williams' "Ordovician of Lake 

 Temiskaming" and the dissertation for the doctorate at Yale by G. S. 

 Hume, entitled "The Stratigraphy and Geologic Relations of the Palae- 

 ozoic Outlier of Lake Temiskaming," 1920. 



Palaeozoic of Hudson Bay 



The early expeditions of Bell, Mclnnes, Dowling, Tyrrell, and 

 others and the descriptions of fossils by Whiteaves, prior to the 

 beginning of the present century, had laid the foundation of our 

 knowledge of this region. We must pass over numerous small addi- 

 tions and refer only to the present status of the stratigraphy. It may 

 be briefly stated that during quite lecent years we see the same ten- 

 dencies at work which have been conspicuous in southwestern Ontario 



