occasional remnants of pyroxene. Though no olivine is seen,
the serpentine is believed to be derived from the alteration
of an intrusive peridotite.

Map 381A of the Department of Mines and Resources, Ot-
tawa, shows a wide band of serpentine extending to the north-
west of Wheaton Creek. Along the creek, serpentine outcrops
in a belt about 3 miles wide. The northern serpentine--sedi-
mentary contact is at Barrington's camp and the southern about
a mile and a half south of the mouth of Alice Shea Creek.
Bright green serpentine was seen on ridges and peaks that lie
far to the south-east of Wheaton Creek.

There are numerous outcrops of sediments within the gener-
al outcrop area of the serpentine belt. The serpentine, in-
asmuch as it is an altered intrusive rock, is presumed to en-
close the sediments not only along their strike but at depth.
Although nowhere was the downward extension of the sediments
actually seen, their depth, no doubt, would be roughly propor-
tional to their areal extent.

Igneous rocks. Intrusive igneous rocks outcrop in sever-
al areas. One is on the summit and north-eastern slope of
the mountain west of Two-Mile Creek. The rock there is mass-
ive, grey, granular quartz-diorite with almost equal amounts
of light and dark minerals. It is partly altered to chlorite
and epidote.

Another area of intrusive rock extends westward from the
head of Alice Shea Créek, across the top of the ridge and down
into the bottom of Wheaton Creek. At its widest it is about
1,200 feet across. The rock is a medium to dark grey, massive
though considerably altered diorite. Similar rock was ob-
served over a fairly large area to the west and north-west of
King Mountain and although the peak was never climbed, it is
believed to be diorite as well.

Both the diorite and quartz-diorite intrude serpentine,
but nowhere were they seen in contact with the sediments.
The serpentine ordinarily is greenish-black, but for several
hundred feet from a diorite or quartz-diorite contact is a
bright yellowish-green.

Dyke rocks, though changeable from place to place in
granularity, are light-coloured, almost devoid of dark miner-
als and composed essentially of quartz and feldspar. They
may generally be referred to as aplite. They range in width
from 2 to 10 feet. One dyke intrudes slate on Wheaton Creek
about a mile and a half south of the mouth of Alice Shea

Bea see