354 _ Scientific Intelligence. 
rock in place. The materials were thrown out of the excavation in con- 
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structure ard characteristic color of the argillaceous limestone of that 
formation. Differing so especially from any known beds in the Niagara 
be proved, it will afford sufficient ground. for separating these beds from 
the Onondaga-salt group, and for establishing a distinct group. It seems 
quite probable that the limestones of this period have their eastern €x 
tremity i 
j re, fr 
ell as from similarity of lithological character, there seemed no sv 
cient ground for separating them from the non-fossiliferous beds of the 
Onondaga-salt group. Since, however, in Canada, these beds attain 
considerable importance, and (admitting the conclusions above give? 
acquire a still greater thickness and more distinctive character on the 
ississippi river, it seems necessary to elevate them to the same rank as 
the other groups of the series.” Geology of Iowa, vol. i, p. 75; 1857. 
* The t being considered objectionable, on account of a renee 
md u me rock occurring also at Guelph, it has been called t 
“Guelph formation,” in the nomenclature of the G ological Survey of Canada. 
y View: the presence of the Onondaga-sal up proper in bans 
sin e somewhere 2d in question, and I have only to rema' is’ 
that I have see ns on di yo 
