W. E. Logan on the Rocks of the Quebec Group. 369 
weathering gray and black calcareo-magnesian slates, and occa- 
sionally with yellow-weathering sandstones. In a few places, red 
slates are intermingled with the others. 
Southeastward from the St. Lawrence, the limestone conglom- 
erates of Point Lévis are distributed over a breadth of more 
than two miles. In the North Ridge, there are four bands, num- 
bered 1, 2, 3, 4, on the map; on which is represented, in addi- 
tion, a long lenticular bed (4*) subordinate to 4, but separated 
from it by slate. The lenticular bed is composed of brown-weath- 
ering magnesian limestone, but appears to contain few or no en- 
closed masses of the pure limestone. The bands 3 and 4 are, 
respectively, A? and A® of a former description. You will per- 
ceive that northeastwardly they converge a little; and at the 
time of that description, 1t was not determined whether they — 
were to be considered two distinct beds, or one a repetition of 
the other. They are now taken to be two distinct beds. 
Followed northeastwardly, they appear to be dislocated by 
a fault near the St. Joseph Church road; but beyond this 
they are easily traceable around the extremity of a trough, 
with a deep channel worn between them in the slate. After 
ing the axis of the synclinal, the band 4 comes to the lime- 
stone of Guay’s quarry, which is notbing more than a large len- 
ticular mass of pure limestone, subordinate to the band. South- 
westward of the quarry, both bands are seen again crossing the 
St. Joseph Church road, and again coming against the transverse 
fault. This fault appears to show an upthrow on its southwest 
side; since on that side the opposite outcrops of the trough are 
thrown towards the centre. 
Continuing to trace the outcrops on the southern side of the 
trough, that of band 4 gradually thins, and disappears at P, in 
less than a furlong; while that of the band 3 becomes more con- 
spicuous, and shows a great development as it folds over an 
anticlinal axis just eastward of the eastern boundary of the fief 
Ste. Anne. From this it returns towards the Church road, but 
becomes concealed about fifty yards before reaching it, after 
again showing the effect of the fault, in a much smaller horizon- 
tal displacement than before. On the northeast side of the an- 
ticlinal axis, on both sides of the fault, the dip is to the southeast- 
ward, and is therefore overturned; but from the character of 
the displacement, it is evident that beneath the surface, on the 
northeast side of the fault, the inversion must be compensated 
for by a change to the northwest in the slope. 
A little above the outcrop of band 4, at P, there occurs a 
layer of sandstone, which is traceable on the fief Ste. Anne over 
the anticlinal axis; and a sandstone approaches the outcrop of 
band 8 at A'. In the description of 1860, this was su sai to 
show that possibly the stratigraphical place of the band 4 might 
