65 
[Marcoiu. 
many so freely used by Logan and Mr. Selwyn in all their dealings- 
with Canadian geology. At Pointe Levis, where I have examined 
every outcrop and almost every large stone found there, the trilo- 
bites, brachiopods, cephalopods, etc., are not in boulders, nor in 
conglomerates, but in the lenticular masses of magnesian lime- 
stone inclosed in the graptolitic slates. 
As a resume , Mr. Selwyn claims to have “eliminated from the' 
Quebec group (of Logan) the metamorphic older series, and also- 
considerable areas of Trenton, Utica and Hudson river/’ and he 
prefers to use the name of Levis instead of Quebec group because 
he has shown the non-existence of Sillery and Lauzon apart from Le- 
vis. Still more, sixteen years after me, he has revived, without re- 
ferring to my observations, another group, the Citadel hill of Quebec 
which he considers as Utica-Lorraine, but a special Utica-Lorraine 
enormously thick, containing a graptolitic fauna about the age of 
which he disagrees with his palaeontological adviser Professor Lap- 
worth, deprecating as he says “ palaeontological stratigraphy.” 
All the alterations proposed by Mr. Selwyn are neither impor- 
tant, nor of any permanent value. His classification of some strata 
of the Logan Quebec group into his so-called Cambrian had been 
anticipated by me sixteen years before ; his transfer of Logan’s. 
Potsdam formation from above the Levis, into it, is an error re- 
placed by another, for the formation of St. Denis and Bic har- 
bor is neither Potsdam nor Levis, but older, being Georgia. And 
finally his opinion that the Citadel hill strata, regarded by Logan as 
a part of his Quebec group, and the homotaxis of the Caleiferous- 
Chazy, are the equivalent of the Utica-Lorraine and consequently 
transferred from the base of the Champlain system to its upper- 
most part, is untenable and contrary to stratigraphy, palaeontol- 
ogy and lithology. Since 1862 I have referred all the strata of the 
city and Citadel hill of Quebec, to their proper place in the classifi- 
cation, as the equivalent of the Swanton slates of Vermont, which 
are a part of the Black Taconic slates of Dr. Emmons, just above 
the Levis group and far below the Utica-Lorraine, Trenton, Chazy, 
Calciferous and even the Potsdam which is wanting round Quebec. 
selwyn’s classification of 1884 to 1887- 
In 1884, Mr. Selwyn published with a descriptive sketch a large 
: Map of the Dominion of Canada geologically colored from surveys 
FEBRUARY, 
PROCEEDINGS B. S. N. H. 
VOL. XXIV 
5 
