i89J.] 
215 
[Marcou* 
several parts of Champlain street at Quebec, and form with the 
slates in which they are enclosed almost one-third of the moun- 
tain on which the Chateau St. Louis, the old city of Quebec and 
the citadel are built, as it is marked on the section fig. No. 6. 
It is probable that the part of the bed of the St. Lawrence, be- 
tween Pointe-Levis shoal and the “Sault du Matelot” at Quebec, 
is formed entirely of those pudding limestones interstratified with 
slates; the slates, as usual in the Laconic system, being much 
thicker and more frequent than the limestones. 
South of and close by the church of St. Joseph, there is a small 
lenticular mass of magnesian limestone, fifteen feet thick and 
very limited, without fossils. Then come twenty feet of slates, 
dipping at an angle of sixty degrees. Above it we meet the elon- 
gated lenticular mass of true conglomerate, which I have called 
outcrop of the “Croix de Temperance,” in my paper of 1864 — 
the only conglomerate in the full sense of the word existing at 
Pointe-Levis. Its thickness at the section fig. No. 7 is only 
fifteen feet ; some thin beds of magnesian limestone and gray 
slates are interstratified iu forms of spindle ( < fuseau ). No fossils 
have been found in either the pebbles or in the interstratified mag- 
nesian limestone and slates. In 1863, a house, called “Letellier 
house,” built on that true conglomerate, was a prominent land- 
mark between the Main street of Pointe-Levis and the Redoubt. 
From that house a small plateau extends toward the foot of the 
Redoubt, and at about mid- way, inclosed in slates, there is an 
outcrop of magnesian limestone with fossils, which is a prolonga- 
tion of the lenticular mass of the Redoubt, after its sharp turn, a 
few yards eastward opposite the second Chapelle. Near the 
northern foot of the Redoubt the slates dip more and more ; and 
then the heavy bedding rocks, indistinctly stratified, as they al- 
ways are in the lenticular masses of the magnesian limestone of 
the Taconic, dip south-east at an angle of seventy-five degrees, 
passing rapidly to the vertical, at the top of the Redoubt ; then 
dipping in the opposite direction north-westward under an angle 
of eighty-five degrees. The slates at the southern foot of the 
Redoubt dip at an angle of eighty-six degrees toward the north- 
west ; and finally the conglomerate band of the “Croix de Tem- 
perance” dips also north-westward. The reversion of the dip of 
the strata at the Redoubt is due to a local fold, and the difference 
of thickness of the slates, conglomerate and magnesian limestone- 
