322 Sir W. E. Logan on the Quebec Group, and 
the St. Lawrence, diminishing gradually to about thirty-five 
nucleus concentricus, Asaphus platycephalus (Stokes). Those con- 
tained in the black shales are Graptolithus bicornis (Hall), and 
G. pristis (Hessinger). There is thus no doubt whatever that the 
imestones are of the Trenton and the shales of the Utica 
mation. . 
On the opposite side of the north channel, at the up 
the Island of Orleans, there occur about 500 feet of bl 
River formation. They oe S.E. < 50°, and there rests 
le 
them (the contact being visible) a series of magnesian shales: 
3 SS ; | 
and Black River limestone; }, Ste. Marie sandstone; « Haront | 
omerates; H, Level of fake Haron. A, Laval. ok ton Sea, Horizontal sil | 
al scale, 1 inch to 1 mile. ; M 
dOurs. In one of the white beds near Marquette, °°" 
obtained. a Ple resembling P. Laurentine ve 
terous formation, and observed the occurrence, 17 
. eters 2 
4d 
