67 
[Marcou. 
Champlain system or Cambro-Silurian. There is a want of harmony 
between the map and Mr. Selwyn’s expressed views, for he says 
that the Levis group belongs to the Lower Silurian (Champlain) 
while on the map he colors all the localities of Pointe Levis, St. 
Denis, Bic harbor, etc., as Cambrian. In fact we do not know 
with any degree of certainty what Mr. Selwyn intends by using the 
English names Cambro-Silurian and Cambrian. He regards the 
Levis group as superior to the Potsdam, and contemporary with 
the Calciferous, perhaps even the Chazy, while on the map Pointe 
Levis and the island of Orleans is colored as Cambrian. 
There were confusions enough brought us by the extraordinary 
classification and nomenclature of Logan, without adding new 
causes of error and new misunderstanding by the importation of 
English names and classifications, which are used a little too freely 
by Mr. Selwyn, often without explanation and against plain facts. 
The geological map of Mr. Selwyn has a band of Cambro-Silurian 
at the northern part of the Gaspe peninsula, between Marsouin 
river and Griffin cove, which is referred by him to the Utica-Lor- 
raine ; while Professor Lapworth declares that there is no trace there 
of that group. 
The map “southeast quarter sheet,” which accompanies Part J, 
“Annual Report, 1886,” differs entirely from the general geological 
map of 1884. In it three large bands of Cambro-Silurian extend 
from New Hampshire to Artabaskaville and St. Albert replacing 
the Silurian and even the Cambrian of 1884. The so-called Cam- 
bro-Silurian strata of Mr. Ells’ report and map are mainly slates of 
considerable thickness, with now and then lenticular masses of mag- 
nesian limestone and sandstone inclosed. They are for the most part 
barren of fossils ; graptolites only are found, and some microscopic 
examinations have revealed the existence in some of the limestone 
of organic remains, which are very rashly regarded as an indication 
of the Trenton group, or upper part of the Chazy. The grapto- 
lites, found in the slates at Magog and Stanstead, indicate the third 
zone of graptolites, or the Swanton and Citadel hill group of the 
upper Taconic. 
It is evident that Mr. Selwyn and his associates are calling Cam- 
bro-Silurian (Champlain) the Upper Taconic of New York, Vermont 
and the vicinity of Quebec, as well as all those graptolitic slates of 
the eastern townships of the province of Quebec. On Mr. Selwyn’s 
map the Cambrian occupies first an area south and west of Mon- 
