332 The American Geologist. cane 
of the Animikie rocks of the Thunder bay region, where the 
nearly horizontal shaly slates and impure dolomytes with 
odlitic layers of chert and jasper hardly show any hints of 
metamorphism and have a surprisingly modern look as com- 
pared with even the Huronian of Thessalon. 
When we take into account this fact, and also the fact 
that every known region of Upper Huronian is characterised 
by having at its base a great thickness of schist conglomer- 
ate of very peculiar and easily recognizable character, while 
the Animikie shows only a thin basal conglomerate entirely 
different in appearance, it is evident that the evidence is op- 
posed to a correlation of the Animikie with the Upper Huron- 
ian. 
Let us turn next to the stratigraphical relationships of the 
Upper Huronian to the lower Huronian, and of the Animikie 
to the Lower Huronian. There can be no doubt that the great 
basal conglomerate of the Upper Huronian, found from 
point to point for at least 800 miles acress northern Ontario, 
represents a long time interval between the two formations 
during which great erosion took place, yet in general no im- 
portant unconformity in attitude has been noted between them. 
Wherever the two have been distinguished we find the schist 
conglomerates having the same strike and the same nearly 
vertical dip as the adjoining schists or the iron range rocks 
of the Lower Huronian, clear evidence that the two series 
of rocks have undergone to a large extent the same squeez- 
ings, shearings and foldings and so have developed similar 
schistose structures. As shown by professor Willmott, they 
have both been affected by the eruption of the adjoining Laur. 
entian areas. So far as my own experience goes the paral- 
lelism of strike and dip between the Upper and Lower Hur- 
onian is complete, though in some cases the Upper or the Low- 
er series may be found without the other, when of course, evi- 
dence must be wanting on this point. Even in the original 
Huronian region, where the Lower Huronian is largely absent, 
there are some rather uncertain examples of this parallelism, 
as for instance at the north end of Echo lake, where the lower 
“slate’’ conglomerate rests upon green schist, which is prob- 
ably Lower Huronian. 
We may hold then that in general when the two subdivis- 
ions of the Huronian occur together they are parallel as to 
