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and the north closure at the "Gap", 9.5 miles north, is over 1,000
feet. The structure exposes Upper Triassic strata on Sikanni Chief
River, but upper Bullhead strata appear on a creek at the north end
of Pink Mountain and 2 miles south of the river at only a slightly
higher elevation.: This locality marks a saddle in the major struc-
ture, and the anticline on Sikanni Chief River has Separate closure
from that of Pink Mountain.

The thrust fault underlying the structure was observed
on Sikanni Chief River and on a creek 2 miles to the south. On
Sikanni Chief River the fault dips west about 30 degrees. It is
believed to be continuous along the entire east side. Field evidence
to support this statement is limited to the two localities cited.
The stratigraphic displacement of the fault on Sikanni Chief River
is about 1,000 feet, where middle to lower Bullhead strata are thrust
onto the uppermost beds of the groupe On the creek at the north end
of Pink Mountain upper Bullhead strata are thrust onto shales of the
Buckinghorse formation. The displacement there is obviously not
great, but is probably considerably less than it is in front of the
highest part of the structure.

Structures immediately to the east of Pink Mountain have
been mapped only along Sikanni Chief River and tributary creeks,
where five anticlines ina distance of 4 miles were noted in the
Bullhead group and et Buch imenereey eee -All of these folds
show closure.

POCKETKNIFE ANTICLINE. -

Pocketknife anticline is the name given to a major struc-
ture trending parallel with Klingzut Mountain, west of Minaker River,
‘and crossing Pocketknife. Creek. about 2:miles above its junction with
the Minaker. The anticline on Buckinghorse River may be its south-
ward continuation. Its topographic expression is outlined by Bull-
head strata and rocks of Triassic age. The Triassic beds have an
exposed width of 1 mile for a distance of 10 miles. South closure
is shown by the plunging of Bullhead and Triassic strata immediately
north of Pocketknife Creek. North closure is believed to be repre-
sented by the occurrence of Buckinghorse shales to the east of
Prophet River, along what is considered to be the strike of the Tri-
assic beds farther south. The anticline has a broad crest with dips.
up to 50 degrees on both limbs. No overturned beds were observed.
Sections across the anticline are exposed along five streams flowing
into Minaker River from the west. ‘There are no continuous sections
of the east limb and, in consequence, it is not known whether a west-
dipping thrust is present. On the crest of the fold more than 600
feet of Triassic beds are exposed.

MINAKER RIVER ANTICLINE

Minaker River anticline is a .gently dipping fold that
crosses Minaker River above and below the mouth of Beaver Creek, and
crosses the Highway at about mile 158.5. Dips range from 5 to 10
degrees. This fold is not well outlined, as outcrops in this general
area are comparatively scarce except along stream channels. On
‘Minaker River, below the mouth of Beaver.Creek, the structure is
modified by several smaller folds that were -not observed in outcrops
along the Highway. The anticline is believed to have been produced
by the same forces that formed the higher more pronounced structures
to the west. It seems reasonable to expect that this and similar
folds will continue to depth este be puesene in the underlying Triassic
and BODIES strata .