346 CHARLES S. PROBER 



At the 191a mooting of the Geological Society of America, Pro 

 [essor Charles Schuchert proposed the Cataract formation: "a new 

 formation at the base of the Siluric in Ontario and Now York," 



from a locality called the Cataract in the Credit River region of 

 Ontario. 48 miles northwest of Toronto. 1 In August of the same 

 year Professor William A. Parks in describing "'The Palaeozoic 

 section at Hamilton. Ontario," stated that "a now formation — the 

 Cataract — .... represents an invasion from the north and west 

 at the commencement of Silurian time. The upper limestones and 

 shales oi this formation are highly fossiliforous and present a fauna 

 comparable with that of the Hrasstield formation of Ohio and 

 Kentucky." 3 



Or. Morton Y. Williams described a series of sections in the 

 Niagara escarpment of Ontario in a paper before the Geologioal 

 Society oi America in December. 1013. in which he reported that 

 •'the Medina sandstones of Niagara gorge (125 feet thick^ are 

 represented farther north by dolomite and shales (Cataract forma* 

 tion)." 3 



An article by Or. kindle on "What Does the .Medina Sandstone 

 of the Niagara Section Include?" contains the following sentence: 

 " The examination by the writer of a number of sections holding 

 this fauna [Cataract] in connection with a review of the Niagara 

 section has convinced him that all of the terranes associated with 

 the Cataract fauna are represented in the Medina of the Niagara 

 section." 4 



In a later and exhaustive paper on the "Medina and Cataract 

 Formations of the Siluric of New York and Ontario." Professor 

 Schuchert shows the close relationship of the Hrassrield fauna to 

 that of the Cataract formation of Ontario and also "that the 

 Cataract is a close correlate with the Medina" formation of New 

 York.-- In another place is the statement that "in other words, the 



1 BtdfefM . 5 s XX1Y (March, 1913), 107. 



Twelfth International Congress of Geologists), "Excursions 



in Southwestern Ontario." H ; . p. i;S. 



JJB G . - XXV (March, 1914), 40. 



*Sck nee, X.S.. XXXIX Tune 10. 1914), 918. 



* Bulieti* of tA i . s XXV. .September. 1914) 291. 



