kditorial Comment. 51 
formation is found in contact with the gray granite and the dio- 
ritic rocks genetically associated with it; it is also found in con- 
tact with the schists and with the red granite. From a critical 
study of these various contacts it is evident that the uralite por- 
phyrite formation is younger than the gray granite and the schists, 
but older than the red granite. Since the gray granite pierces 
the schists the latter are the oldest formation. The sequence of 
formations in order of relative age is therefore as follows: 
1. Phyllites and schists. 
2. Gray granite and associated diorites. 
3. Uralite porphyrite and associated rocks. 
4. Younger red granite. 
At the time of the extravasation of the uralite porphyrite 
the schistose rocks had already been folded, and so deeply eroded 
that the underlying granitic masses were exposed. — It is probable, 
however, from the fact that the uralite porphyrite sheets are so 
often found in contact with the schists and phyllites, that the lat- 
ter were not extensively or completely folded up at the time of 
the outflow of the voleanic rocks, and that a great portion of the 
disturbance was effected after that event so that the porphyrites 
were effected by it. . 
The red granite traverses the uralite porphyrite in numerous 
places, but the contact metamorphism is insignificant, and the 
alteration of the volcanic rock is, as above stated, ascribed 
rather to agencies attendant upon crust crumpling forces. 
A perusal of the paper suggests some interesting points of 
analogy with the geology of the somewhat similar regions of 
Canada. For instance the horizontality of the Cambrian of Finn- 
land is comparable with the flat undisturbed attitude of the 
Animikie rocks of lake Superior. The absence of any observable 
basement for the altered schistose sedimentary formations and 
the occupancy of the place of that basement by an irruptive and 
younger granite appears to be very analogous to the conditions 
which obtain in central Canada, as observed by Dr. A. C. Lawson, 
in British Columbia as described by Dr. G. M. Dawson, and in 
Nova Scotia as inferred from the descriptions of Mr. Faribault. 
The gneissic character of the irruptive granites is also another 
feature which the rocks of Finnland and Canada have in common. 
And the establishment of the existence of true voleanie rocks, 
though much altered, in the Archean of Finnland is in harmony 
