Marcou.] 
208 
[Jan. 21 , 
of the river bed. No fossils have been found yet in either the 
quartzite or the fifteen feet of reddish calcareous-sandstone. 
Above the reddish Calciferous-Chazy there is a perfect vertical 
wall, fifty feet high, formed of beds of Black river and Lower 
Trenton limestone, one foot thick, instead of being one or three 
inches thick as they are at Montmorency bridge. 
At Indian Lorette, just close by the bridge, the strata of the 
Champlain system are almost horizontal, with a very slight inclin- 
ation toward the south-east. But in descending the rapids of the 
Charles river, the inclination increases rapidly, and from a dip of 
ten degrees it passes to twenty and thirty degrees, and finally it 
reaches the vertical. We have there good examples of landslides 
by erosion of the Champlain systems strata over the quartzites. 
I did not see on what rocks the vertical beds of the Trenton lime- 
stone lies. On the interrupted and fragmentary section (fig. No. 
4)1 have indicated the quartzites ; but I am not sure ; the Taeonic 
slates so common and which form the whole undulated plain in 
which the Charles river flows, may reach as far up as the vertical 
Trenton strata are. It is a question to be solved by exact and 
minute observations in the field. 
Messrs. Ami and Giroux of the geographical survey of Canada 
have published the following list of fossils, collected by them at 
the foot of the Indian Lorette fall : Illaenus Miller i, Trinucleus 
concentricus , Dalmanites callicephalus , Encrinurus vigilans , Caly- 
mene Blumenbachii , Ceraurus pleurexanthemus , Asaphus platyceph- 
alu's , Beyrichia , Primitia , Endoceras proteiforme , Lituites unda- 
tus , Ambony chia, Pterinea Trentonensis , Ctenodonta dubia , Theca , 
Conularia Trentonensis , Beller option bilobatus, Bucania punctifrons, 
Atrypa hemispherica , Orthis testudinaria , Strophomena alter nata, 
Leptaena sericea , Lingula , Discina , Polyzoa , Pachydictya , and 
Prasopora lycoperdon. As they say, a part of those fossils have 
a Black river facies in the lowest portion of the stTata ; and the 
rest indicate the Lower Trenton limestone ( Loc . cit. pp. 19-20.) 
Quebec-city. — All the lower part of the valley of the St. 
Charles river, is occupied by the Swanton slates of the Upper Ta- 
conic system. The gray and black slates are seen in many places 
on the roads from Quebec to Indian Lorette, to Charlebourg and 
to Beauport, with local folds well marked on the roads to Lorette 
and to Charlebourg, and also on the edge of the St. Lawrence 
river at La Canardi&re. 
