~14.-

Near Babine Lake, and especially in the vicinity of the
Radio Gold Mine property, the Carboniferous greenstones are cut by
fine-grained, dark greyish green diorite dykes 10 or more fect in
width. In places these dykes arc so numerous they make up about
25 per cent of the outcrops.

Mesozoic (?) Volcanics

These volcanic rocks may be divided into two divisions:
(1) andesitic flow and fragmental rocks; and (2) rhyolitic rocks
cutting the andesitic rocks.

Andesitic Rocks The best exposures of the andesitic rocks are
found along the ridge lying between Wright Bay, Babine Lake, and
Tochcha lake, The most characteristic member of this division is
a green or purple eruptive andesite breccia that weathers to a
much lighter shade. Most of the fragments are andesite, but
fragments of rhyolite, chert, granite, and feldspar also occur.
The fragments vary in size from 1/16 inch to 6 inches in diameter
and are embedded in a green or purple glassy matrix. On the north
side of Tochcha Lake a purple andesite flow breccia composed of
fragments of andesite in a hematitic matrix is found, Near ita
dark green, epidotized, augite andesite flow breccia outcrops.
These breccias on the north side of Tochcha Lake have been
correlated with those south of the lake on the basis of litho-
logical similarity only and they may be of different ages.

The eruptive andesite breccia lying between Wright Bay
and Tochcha Lake is interbedded with flows of dark green to black,
porphyritic augite andesites. These andesite flows weather reddish
brown and contain phenocrysts of augite up to 1/8 inch in length.
Of a lesser areal extent are interbedded flows of red, purple, and
lavender, porphyritic trachytes and andesites, They contain
phenocrysts of white feldspar up to one-quarter inch in length set
in a hematitic groundmass.

These andesitic flow and fragmental rocks exceed 1,000
feet in thickness,

Rhyolitic Rocks he only locality in which flows of rhyolite

Wore observed was along the shore of Wright Bay (Babine Lake) whero
they overlie conformably flow rocks of the andesite division, 7
rhyolite flows are dense, non-porphyritic, banded, pinkish brown
rocks.