69 
[Marcou. 
the Chaudiere and Etchemin rivers the flows or sheets of dioritic- 
diabase interbedded with the slates have prevented the existence of 
animals in that part of the belt, and it may be also in some other 
parts between the Chaudiere and St. Armand ; but after reaching 
the counties of Lislet and Kamouraska the belt is quite fossilifer- 
ous, and we have a fine development of the Georgia formation of 
the Middle Taconic. 
As to Pointe Levis and the main part of the island of Orleans, I 
have already had occasion to say that the strata there are the lower 
part of the Upper Taconic and belong to the Phillipsburgh and 
Pointe Levis group, containing the supra-primordial fauna. The 
graptolite bearing shales of Pointe Levis form the second zone of 
graptolites, just above the first zone existing in the Georgia slates ; 
and the other graptolite bearing shales of Citadel hill, and on the 
northern part of the island of Orleans they belong to and form the 
third zone of graptolites of the S wanton and Citadel hill group of 
the Upper Taconic. 
MARCOU’S CLASSIFICATION OF 1860-1888. 
Now that I have given the ever-changing classification and the 
numerous contradictions and confusions of the Geological Survey 
of Canada from 1855 to 1887, I shall describe in a few words the 
great outlines of the stratigraphy of the province of Quebec. As 
far back as 1849, after a reconnoissance of the vicinity of Quebec, 
I recorded in my note book, a part of which was published in 1860, 
in my joint paper with Barrande (Proceed. Boston Soc. Nat. Hist., 
Yol. vii, pp. 376, 377, 378 and 379), that we have there two distinct 
formations : one of very small extent, almost horizontal at the top 
of Montmorency and Indian Lorette Falls, belonging probably to 
the Trenton, and another one, an extremely thick development of 
slates forming the hill of the city of Quebec, Pointe Levis and la 
Chaudiere falls, which has been strongly upheaved and broken 
before the deposit of the almost horizontal Trenton limestone. My 
first impression was correct ; and all my subsequent researches in 
the province of Quebec during the years 1861, 1862, 1863, 1873 
and 1874 have confirmed my views. 
The province can be divided into two very unequal parts. The 
first, by far the smallest and less important geological^, is the coun- 
try round and more specially south of Montreal. Its stratigraphy is 
simply the continuation, on the other side of the boundary line be- 
tween New York and Canada, of the geological formation of the 
