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chief rock type is felsite, but other fine-grained, crystalline rocks occur.
The northern part of the body consists almost entirely of greyish felsite
commonly holding pink feldspar crystals. In some places the felsite is quite
free of fragments, but in other places felsite fragments of varying sizes are so
plentiful that the rock resembles a breccia. A small amount of breccia
and tuff occurs at the north end of the body. Southward from the widest
part of the body the rock appears to change gradually to tuffs and breccias,
and finally, at the south end, through admixture of foreign, water-worn
pebbles, the tuffs and breccias change to conglomerates and finer-grained
sedimentary clastics. Fragmental rocks occur also in the lenticular area
at the end of a tongue-like projection extending east from the main part
of the body.

From the north end of the Klayduc body a sill extends east and
for most of its length parallels the strike and dip of the sediments, but
in part crosscuts the strata. The sill has been folded into a syncline and
anticline.

The part of the Klayduc body that projects eastward from the north
part of the body and is terminated by an area of elliptical outline may
be a cross-section of a volcanic neck and the breccias of the elliptical area
may be the products of the voleanic activity. The rock composing the
neck-like part appears to be massive. It crosscuts the bedding of the
bounding sediments, whereas the breccias of the termination are conform-
able to the sediments. The main part of the Klayduc body may have been
the reservoir from which the extrusives were derived. The body of fluid
rock constituting this reservoir perhaps reached its present position within
the sediments by lateral movements. Possibly other volcanic vents existed,
but the ejected matter seems to have been largely removed. Because the
extruded matter lies near its source, the reservoir seems to have lain close
to the surface. As the tufis and breccias are interbedded with and grade
into sediments, it appears that sedimentation and volcanic activity were
contemporaneous and that the volcano or voleanoes were submarine.

In Anyox district, west of Alice arm, is another large area of igneous
rocks here referred to as the Anyox amphibolite. The body is 14 miles
long from north to south and 8 miles wide. It has not been examined in
detail but is known to be of heterogeneous nature. It is bounded on the
east by sediments of the Hazelton group and on the other sides by Coast
Range intrusives.

The body consists for the most part of amphibolite locally severely
sheared. The eastern half of the body is almost entirely of this nature
and from a distance the rock has a characteristic green colour that makes
the local name greenstone very suitable. Most of the amphibolite is of
medium grain and is not porphyritic. Elongated areas up to a few hun-
dred yards across and up to a mile or more long are of very coarse grain.
The body contains many, small, discontinuous bands of sedimentary rock
that are probably inclusions and roof pendants. Along the southeastern
contact of the body with the adjoining sediments the intrusive nature of
the amphibolite is well shown, particularly on Glacier and Cascade creeks
where the amphibolite truncates the sedimentary beds in an irregular man-
ner and wedge-like masses penetrate the sediments along the bedding