he

but has not been traced by continuous outcrop. The rocks change to
breccia containing fragments of augite porphyrite and the belt appears
to cease in the vicinity of the head of Red Bluff creek.

Near the south end of the ridge west of LeRoy mountain felsitic rocks
of the Copper Belt type appear and they make up the whole ridge between
Washout and Red Bluff creeks. Locally the rock is severely altered and
sheared, so much so that the original character is not always recognizable,
though there is little doubt that the rock is porphyritic and of an intrusive
nature. It contains much disseminated pyrite, some pyrrhotite, and locally
chalcopyrite. It has been largely altered to sericite, chlorite, and calcite,
and because of its mineral composition and as a result of weathering it is
soft and light grey. The altered felsites continue south across Dak river
and for some distance up the slopes of McGrath mountain. Farther south
on McGrath mountain the rocks are augite porphyrites. The felsites
resemble the augite porphyrites except for the presence of augite phenocrysts
in the latter. The two rocks may grade into one another or may belong to
separate intrusive bodies. The augite porphyrite also contains disseminated
sulphides but is not sheared, and although altered to some extent is every-
where easily recognized as a crystalline rock. The augite porphyrite of
McGrath mountain extends northward in a narrow band a short distance
east of the main part of the Kitsault body. Northwards this band becomes
only a dyke-like body some 100 feet wide and eventually disappears.

The southern part of the Kitsault body is divided in two by a band of
sediments. The western part consists mainly of crystalline rock mostly
felsite and which is probably intrusive. Locally fragmental rocks and lava
flows occur. The eastern part consists of augite porphyrite.

Fragmental volcanic rocks occur at several places in the Kitsault body,
but in the main are confined to its borders. In the southern half of the
igneous body tuffs and breccias containing broken crystals and fragments
of felsite occur locally on the ridge between Kitsault river and Red Bluff
creek. West of LeRoy mountain breccias, tuffs, and flows occur at the
eastern side of the body; some of the tuffs and breccias contain fragments
of augite porphyrite and felsite. At East creek, the eastern part of the body
consists of tuffs and breccias and overlies the sediments to the east. North-
ward, tuffs and breccias occur more particularly in a strip next to the
argillite contact. Fragmental volcanic rocks occur in small quantity near
the mouth of Evindsen creek. The part of the Kitsault body extending
north from the mouth of Evindsen creek to Clearwater lake consists largely
of fragmental volcanic rocks. They are roughly bedded and overlie the
sediments to the east and underlie those to the west. The fragments are
mainly felsite. Sediments occur to the north and there sedimentation was
continuous while farther south volcanic products were building up the Kit-
sault igneous body. The wedge-shaped extension of the Kitsault body that
continues northerly to the Kitsault glacier consists of fine-grained, bedded,
red and green tuffs that pass beneath sediments on the east and west.

The Klayduc igneous body is the smallest of the three main igneous
bodies of Alice Arm district. It is 18 miles long and 3 miles wide where
widest. It consists mostly of intrusive rocks holding many fragments of
similar rock types. The body contains also some breccias and tuffs. The