184 BULLETIN OF THE NATURAL HISTORY SOCIETY. 
falls away on the westward before reaching the river, and this,, 
although much more regular in outline than the Caribou Moun- 
tain range, is, I think, probably also another parallel felsite range. 
It appears to cross the river half way between Popelogan and 
Boland's Brooks, and to form in its southward extension the 
divide between the West Branch and Boland’s Brook, and the 
course of the West Branch is apparently determined by erosion 
of the softer rocks between these two parallel ridges. Felsite 
dikes cross the river at several points lower down the Upsalquitch 
at places marked on the Geological map, and again at three dif- 
ferent points not marked on the map, below the Great Falls. Alt 
of these dikes have a general northeast and southwest direction, 
indicating an extensive series of these parallel bands of felsite, and 
erosion between them has probably determined the dirction of the 
branches of the river. From the top of the mountain one can 
follow the valley of the Upsalquitch far to the northward, where 
it appears as a broad, shallow trough ^narrowing where crossed 
by the felsite dikes), into the centre of which the river is cutting 
a deeper channel. It is plain that the Upsalquitch river must be 
very old, not only because of the breadth of this trough-like vallev, 
but also because of the way it cuts across the felsite ridges ; it 
must have been formed before the country was carved down 
* There is a lofty rounrl-summited intrusive looking ridge, which is very probably of 
this same character, running northeast from Mount Peters, which may be continuous with 
Naturalists group near Upsalquitch Lake in that direction, and with Teneriffe, or the Green 
Range, Winslow, and possibly even with Matthew and Bald Head, to the southwest. The 
presence of this series of northeast and southwest parallel ridges, with Silurian rocks, in 
part, at least, between them, is quite in harmony with, if it does not actually substantiate. 
Professor Bailey’s views as to the geology of the Tobique-Nepisiguit region. (See his 
“ Notes on the Highlands of Northern New Brunswick” in this Bulletin, V. 83). The ridges 
might be of late or post-Silurian intrusive felsite forced up among, and in some case forced 
over, the Silurian strata. The fact that Silurian rocks occur between the ridges farther 
north, makes it the more likely that the same is true in the Tobique-Nepisiguit country. 
It is possible this system of parallel ranges may be traced a little farther. One may find 
some evidence for one of them in the line of Missionaries Range, LaTour, Wightman, Feld- 
spar Mountain, and Mount Edward, and perhaps another in Mount Denys, Cartier, Ray. 
mond, DesBarres, and perhaps Nalaisk, but it must be admitted that they are not very 
distinct, and their existence is perhaps doubtful. An attractive feature about this extension 
of the ranges is the clear explanation it gives of the origin of the Nepisiguit above and 
below Portage Brook, foi it would make these parts strictly liomologous with the branches- 
of the Upsalquitch farther north, such as Ramsay Brook and Hutchinson Brook, etc. But; 
this subject needs more study. 
