(xeotogp of Quebec City. SYt 



undisturbed regions in Ontario at Ottawa, Toronto, Weston, 

 Oakville, Collingwood, etc., intermediate between the Utica 

 terrane and the base of the Silurian Epoch marks another 

 terrane. 



These two faunas, I hold, are very distinct both in their 

 palseontological and stratigraphical relations. The Lor- 

 raine terrane, according to Dr. Selwyn's classification of 

 formations (" Index to the Colours and Signs used by the 

 Geological Survey of Canada,") has a definite position, viz., 

 at the summit of the Cambro-Silurian or Ordovician system, 

 The strata at Quebec, either on physical or palseontological 

 grounds, cannot be referred to the Lorraine nor to the 

 Utica, nor yet to the Trenton nor to the Black River for- 

 mation. 



Sir William Logan referred the Quebec city rocks to the 

 Levis division of Quebec group. From examinations re- 

 cently made, the fauna which Mr. Weston, Mr. Griroux, 

 I'Abbe' Laflamme and the writer have been able to obtain 

 from the rocks of that locality, presents some fifty species 

 of fossils, including graptolites, brachiopods, ostracods and 

 trilobites, different from Levis forms and yet capable of 

 being correlated with forms from a portion of the Quebec 

 group of Logan, as described in his Newfoundland section, 

 as also with Cambro-Silurian strata in the Beccaguimic val- 

 ley of New Brunswick. 



To state the precise geological horizon to which the 

 strata at Quebec city belong, I hold, is perhaps premature. 

 These rocks appear, however, to occupy a position in the 

 Ordovician system higher than the Levis formation being 

 akin to it, but lower than the Trenton, and probably an 

 upward extension of that peculiar series of sedimentary 

 strata occurring along the present valley of the St. Law- 

 rence, which, owing to the peculiar conditions of deposition 

 of the specialized fauna entombed. Sir William Logan ad- 

 visedly classed under the term "Quebec Group." This 

 would make the rocks at Quebec about equivalent to the 

 Chazy formation of the New York and Ontario divisions. 



