“Plants identified :

Cladophlebis virginiensis (Fontaine)

Cladophlebis fischeri? Knowlton

Nilssonia shaumbergensis (Dunker)

Nilssonia cf. orientalis Heer

Ptilophyllum arcticum (Heer)

Pterophyllum concinnum Heer

Czekanowskzia sp.

Ctenis? sp.
This flora denotes a Lower Cretaceous age and is considered to be homo-
taxial with that from the Kootenay formation.”

The evidence suggests that sediments of Cretaceous age (Skeena for-
mation) overlie conformably the Hazelton sediments. As the formations
are much alike lithologically the presence of the younger strata can be
determined only by its higher stratigraphic position, by fossil evidence, or
through the presence of coal seams. The Skeena formation would be
expected on the higher parts of the mountain or in any valleys where it is
preserved through synclinal folding.

COAST RANGE INTRUSIVES

The contact zone of the Hazelton sedimentary and volcanic rocks with
the Coast Range intrusives is wide and very irregular in this area. A
large body of granodiorite and quartz diorite, considered to be part of the
main batholith, extends from Lakelse lake east to Zymoetz river, north to
Terrace, and northwest from Terrace in a wide band east of Kitsumgallum
river to Kitsumgallum lake. From this main body long tongues of diorite
and quartz diorite extend eastward, cutting the volcanic rocks in the vicinity
of Pacific, on Kleanza mountain, and on Bornite mountain. A large stock
of granodiorite and quartz porphyry intrudes the volcanics at the head of
Kleanza creek, and diorite and gabbro stocks cut similar rocks near the
heads of Chimdemash and Legate creeks. Small intrusive stocks of grano-
diorite and quartz diorite cut the sediments on Goat and Maroon moun-
tains, and the core of Seven Sisters mountain is a stock of quartz diorite.
The granitic rocks are cut by a variety of later dykes. Mineral deposits
are present, but are not as numerous nor as rich as are the deposits in the
Hazelton series.

The age of the Coast Range intrusives is not definitely known. As they
cut Hazelton sediments of Jurassic age they have always been considered as
of Upper Jurassic age or later. On Seven Sisters mountain Lower Creta-
ceous rocks were folded at the same time as underlying Hazelton sediments.
Presumably the folding and batholithic invasion took place at about the
same time, and if so the batholithic intrusion is of Middle Cretaceous age
or later.

DYKES

Dykes of granodiorite, quartz diorite, diorite, gabbro, quartz-albite,
and lamprophyre with their various porphyritic phases intrude the Hazelton
group rocks and the Coast Range intrusives. These dykes usually have
vertical attitudes, average between 2 and 20 feet in width, and seldom
exceed half a mile in length.