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Group Formations Lithology

Thickness in feet

Non-marine Bullhead Non-marine sandstone, shale, and con-
4,000-4,500 glomerate; coal seams

~ |Monach Marine sandstone; some shaly beds

Bullhead gs  |300-400

a

3 [Beattie Peaks Marine shale

FQ -|600-1,200

oO

= Monteith Marine sandstone; some shaly beds

|1,000-1,750

Monteith Formation

‘Monteith’ was proposed as a formational name by Mathews (1947) to
embrace a thick succession of sandstones lying between the underlying
Fernie shales and the overlying Beattie Peaks formation. It is said to be
well exposed on the north face of Mount Monteith, and this, presumably,
is the type locality of the formation.

The Monteith formation has a wide distribution in the Carbon Creek-
Mount Bickford map-area, extending around all of the Carbon Creek basin
from Mount Monteith north to the valley of Peace River and extending
also south to the headwaters of Beaudette Creek, a tributary of Pine Liver.
Mathews states that the formation is 1,750 feet thick on the western slope
of Beattie Peaks, but does not exceed 1,000 feet in the north at Indian Head.

The lower and greater part consists of “dark grey arkosic sandstone,
massive to flaggy, and in places showing crossbedding and ripple-marks.
This sandstone occurs in beds usually from 10 to 30 feet thick, each separated
by a few feet of shale or shaly sandstone”. The upper part consists of 500
feet “of white quartzite, commonly stylolitic and locally vuggy” (Mathews,
1947). The contact with the underlying Fernic is said to be conformable.

Mathews favours a marine origin. “No terrestrial fossils, plant
fragments, or coaly beds have been found.” Marine fossils are present in
talus from either the upper part of the Monteith or lower part of the
Beattie Peaks formation. Mathews notes that crossbedding and ripple-
marks suggest “that the sediments were deposited in shallow water”.

Beattie Peaks Formation

The Beattie Peaks formation was established by Mathews for a litho-
logical unit, mainly of shale, lying between the coarser sediments of the
Monteith formation below and of the Monach formation above. It is well
exposed on the western slopes of Beattie Peaks, the type locality.

Like the Monteith formation, the Beattie Peaks extends as arim around
the Carbon Creek basin. It is about 1,200 feet thick on Beattie Peaks,
about 750 feet at Indian Head, and 600 to 700 feet on Beaudette Creek
(Mathews, 1947). It consists of shales, shaly sandstone, sandstone, and,
in a few localities, quartzite. “A few beds of clay ironstone, rarely more