328 The American Geologist. Jone 
responded to both the original Huronian and tae Animikie; 
and that therefore the original Huronian and the Animikie 
must be equivalent to one another. He further believed that 
the Vermilion iron range of Minnesota was of the same age.* 
To support this view he compares the lithology of the Hur- 
onian of lake Huron with that of the Animikie and finds them 
alike. He states correctly that the Huronian of lake Huron 
consists essentially of a thick series of quartzytes and of gray- 
wacke conglomerate; but when he proceeds to describe the 
Animikie as consisting chiefly of quartzytes, he certainly goes 
bevond the facts as observed at Thunder bay and the coast as 
far as the Minnesota boundary. There the rocks of this series, 
as agreed upon by all geologists who have written on the sub- 
ject but himself, are mainly shaly slates passing downwards 
into black cherty rocks, and with sills of diabase at various 
levels, the uppermost looked on in earlier days as a “crowning 
overflow.”” Yet he finds “ton the west side of Thunder bay 
many hundred feet of ringing quartzyte and hard clay slate.” + 
After personal examination of that shore I can say with 
confidence that no hundreds of feet of any rock usually called 
quartzyte are to be found there, and in any case these dark 
earthy \siliceous slates or cherts are as different in character 
as possible from the white or red or brown quartzytes north 
of lake Huron. 
In almost every particular the Animikie rocks at Port 
Arthur are in striking contrast with the Huronian of lake 
Huron. Irving states, however, that thicker quartzytes exist 
along the Minnesota shore of Superior though his own descrip- 
tion of them is sufficient to show that they do not resembie 
the quartzytes of lake Huron. They are spoken of as “at 
times arenaceous, in other cases hard, ringing quartzyte, again 
true clay slate, and in yet other places of an intermediate 
nature ;”= a description that is as far as possible from any 
rock series in the Huronian and especially from the character- 
istic glassy quartzyte. We may conclude then that the lith- 
ological argument is not in favor of the equivalence of the 
two series of rocks. 
As a support to his revolutionary view he states that Logai 
was so much in doubt regarding the Animikie that he placed 
* U. S. Geol. Sur., 3d An. Rep., p. 1.70, etc. 
+ Ibid., p. 160. 
t Ibid., p. 158. 
