74 An Ba VALEMOTT 
In the vicinity of Port Arthur I have found greenish schist 
with included ferruginous sediments, and also conglomerates 
carrying pebbles of the first. Both of these have highly inclined 
dips and have granite-gneiss in eruptive contact with the first at 
least. The lower series has numerous beds of pyritic quartz 
rock exactly like the beds in the lowest sediments at Michipi- 
coten. Clearly these two series correspond to the Lower and 
Upper Huronian, as above defined. Overlying both, and also the 
granite-gneiss with very gentle dip is the Animikie series. 
That the Animikie is later than the Upper Huronian or 
“Original Huronian,” as it is often called, may be shown in 
several ways: 
I. Stratigraphically it is the third series of sediments upwards 
from the bottom of the geological column in the Lake Superior 
region—the Upper Huronian is the second. 
2. Lithologically, the two series are quite different, and so 
presumably are of different age. There is very little conglomer- 
ate at the base of the Animikie—in the Huronian the quartz- 
ites, slate conglomerates, and jasper conglomerates are of great 
thickness. The oolitic jaspers found in the Animikie are quite 
absent from the Huronian. The shales, so important in the 
Animikie, are almost unknown in the Huronian. The laccolitic 
sills of the Animikie are lacking in the Original Huronian. 
3. Structurally, the two series are usually said to be alike in 
that both lie flat and undisturbed. While this is quite true of 
the Animikie, it is only partially true of the Huronian north of 
the Georgian Bay, and is untrue of the Upper Huronian about 
Batchawana and Michipicoten. Coleman* and Murray? have 
described cases of vertical dip within the so-called Original 
Huronian, and others have been observed by myself. These 
seem to occur around the outer portion of the Huronian basin, 
and more gentle dips obtain in the central part. Evidently the 
Huronian has been subjected to forces which the later Animikie 
has escaped. 
4. Assuming that the large areas of eruptive granite-gneisses 
"Bur. of Mines, Ont., 1901, p. 189. 2 Geol. Sur., Can., 1858, p. 95. 
