woes DESCRIPIION OF. COUNTRY

The Foothills along Peace River are high, rugged, and one dissected. Maximum relief -on the upland is be- tween 1,500 and 2,500 feet. A few high ridges rise to an elevation of 6, 000 feet above sea-level. The valley of the Peace has wide river flats at an elevation of about 1,800 feet and is bordered by long, high terraces. At the eastern border of the Foothills is the wind gap between ‘the southern end of. Butler Mountain and Portage Mountain. It is now partly filled with terminal moraine deposits, but in pre-glacial time was occupied by Peace River on its course to the western border of the plains. The present stream flows around the south side of Portage Mountain, where it has excavated the deep | FeO ‘River. EI :

1M Within the Foothills bedrock is ‘best deeite sed! on the high ridges above the terraces, or ih tributary stream valleys cut through the- terraces: Bedrock is almost continuously ex~ poséd: in the steep walls of Peace River Canyon’ at the eastern. border of the eae Do. asset ee os wah

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4

a “\)) BULLHEAD GROUP.

Tede “The Bullhead group includes ene Oe ea aa ‘ne 5 Dunlavy ‘below: and the.. Gething above.-.Most of the coal is. in the Gething, but a few thin seams occur in the uppermost part of the Dunlevy. The basal beds of the Dunlevy are marine and. possibly of late Jurassic age, but.most of the Se is probably non-marine and of ‘Lower Greece gas ages. 5

Jaks The name ‘Dunlevy" is apolied to ahee was formerly — aaned the Lower member of the Bullhead (McLearn , 1922); ‘that. is, to the beds that lie between the Jurassic dark ‘shales dew © low and the Gething formation above. The lower and greater part of the formation consists of massive,:. coarse, hard sand- stone with some finer sandstone and shale... » At ‘phe ‘Gop “are 3.” conglomerates and sandstones with thin zones: of fine sand-.- stone, siltstone, dark shale, and thin. coal: seams. Some ef. the fine sandstones. and siltstones in this: upper part. are ripple-marked, and carry fossil wood fragments and fine plant debris. The trve thickness of the. Dunlevy: formation is Li exactly known, but may be as much.as. 3, 000 Pocky:

The Gething formation overlies aes oalenea. Boner ine! ably, and the contact is drawn arbitrarily where the con- glomerates and coarse sandstones disappear or; become: rare, and fine sandstone, siltstone, shale, and coal-seams become more common. The formation consists of interbedded, ‘fine- to medium- grained sandstone, siltstone, clay ironstone, ghale, and coal beds. Conglomerate and coarse sandstone are rare...The sand- stone beds are massive to layered or flaggy,. and white or eream to light gréy or brownish. Crossbedded and ripple- marked sandstones. and-.siltstones are present-in places. A few of the sandstone members are massive, thick, and per-: sistent. These have been named and are shown on Figure 3. Shales are grey to black and vary in thickness from 2 inches to 10 feet. Clay ironstone forms thin and thick beds and... occurs as concretions in several coal seams.- Well-preserved plant remains are not common,. but are present in some shales, siltstones and clay ironstones. The flora is correlated with that of the Lower Cretaceous, Luscar formation end with: that of the, the lowér. part.; of the RG eal). Se ‘of pone ao AT Oere