vee

In the intermediate or Foothills belt the topography is
more subdued except for that of Pink Mountain, which is composed of
_.-hard, quartzitic sandstone,beds of the Bullhead group. Most of the
‘pelt is underlain by Lower Cretaceous shales that weather easily.
This belt, as observed either from the mountains to the west or from
the plateau to the east, has a trench-like appearance paralleling the
mountains and crossed by numerous streams from the west.

The eastern or Plains province is bounded on the west by
a high, west-facing scarp formed largely of sandstone and conglomerate
beds of Upper Cretaceous age. To the east of the scarp the country
has a plateau-like appearance. It is dissected by Beatton, Sikanni
Chief, Buckinghorse,. Prophet, and Muskwa Rivers and may represent the
remnant “of a former peneplain. It slopes gently to the en.8t and where
traversed is essentially free of glacial Gepost ts.

STRA TIGRA PHY
GENERAL STATEMENT

The rocks exposed within the area traversed range in age
-from Lower Mississippian to Upper Cretaceous. Near the mountain
front the Mesozoic strata have an aggregate thickness of about
9,500 feet. Only 900 feet of Palaeozoic rocks are exposed, and their
contact with overlying Mesozoic strata was not observed. Several of
the formational and group names used along Peace River have been
adopted, but a new subdivision has been made of the strata of Lower

Cretaceous age Cone eee the marine Fort St. John group.

TABLE OF FORMA TLONS

a

; Thickness

Era 91! Period 1 = Epoch (Group) = 1" Formition 7/7) | Feet

Cenozoic Quaternary Pleistocene eRe tives i 0-700
|. and Recent aie

eee re nee ee ee ome me we we hw ce ee ee ee enn ee ae ne hee Se ek ee ny Se em cs my ae i ar a mes te we ee me ee a eg mms eae man men ee Me A os sm eee as gma nD ma ee

Unconf ormity
| Upper _ Dunvegan | 500-
; Cretaceous i
H 3 cS : i :
Mesozoic | Pa RCO RECN Ee aaa ET MUINO Rare ad :
+ Lower iFort St. John : Sikanni i 980
, Cretaceous | Cretaceous i ana Oe
'Buckinghorse —_ 3,000-3,600
[Bullhead .1,200-1,600
in i $ ‘ r Ak :
Unconformity ?
Jurassic Lower ; Fernie 18-240
i Unconf ormity
e —
Triassic | Upper and Schooler Creek 2,900+
i i Middle i

Unconformity ?

pecemreeecacwenngrmee cen | nae RE SS LALO
? Fy Hi :
3 ;

Palaeozoic | Carboniferous Mississippian : Sas 900 (observed)

H

UNS 3 H