Figure 10. Bedding style of Mural Formation on Kimball
Ridge. (GSC 191006)

original bedding. In places these bands show layer-
parallel, small-scale isoclinal folds. They are also found
in limestones of the Cunningham and Yankee Belle for-
mations. Marble has developed along some faults through
Mural Formation limestone. It is mostly cream to white
with 0.5 to 2 mm crystals of calcite.

Dolostone weathers grey, is mottled grey and white
on fresh surfaces and is coarsely crystalline. It is compo-
sed of euhedral to subhedral dolomite crystals and has
minor amounts of porosity. It is most abundant in one
outcrop area at Cunningham pass. The dolomitization
is a late feature associated with deformational controlled
replacement as argued for the dolostone of the Cunning-
ham Formation.

Minor amounts of shale are included in the Mural
Formation on Kimball Ridge and Turks Nose Mountain
as described by Sutherland Brown (1963).

Age and correlation. The Mural Formation is Lower
Cambrian as determined from included trilobites and
archaeocyathids. Trilobites ranging from early to late
Lower Cambrian were identified previously from the ref-
erence section in the Cariboo Mountains (W.H. Fritz
in Campbell et al., 1973, p. 51-53) and from Turks
Nose Mountain and the hill east of Bowron Lake
(V.J. Okulitch in Sutherland Brown, 1963, p. 28).
Archaeocyathids of the Lower Cambrian were identified
from Turks Nose Mountain, Iltzul Ridge and the hill just
east of Bowron Lake (V.J. Okulitch in Sutherland Brown,
1963, p. 27).

Three previously unrecorded fossil localities have been
found within the Mural Formation south of Cariboo
River. On Kimball Ridge a thin bed of orange-weathering
limestone contains poorly preserved archaeocyathids and
trilobite fragments (52°54’35’’N, 121°02’42’’W). Exact
stratigraphic position is unknown due to structural con-
tacts but the occurrence is probably in the lower middle

part of the Mural Formation. Abundant well preserved
archaeocyathids were found 5 km southeast of Black
Stuart Mountain at an elevation of 1860 m (6100 feet;
$2°51’53”"N, 121°04°57’’W). These archaeocyathids
stand out in relief displaying features of their wall struc-
tures. Although several species appear to be represented,
detailed identification has not been done. The archaeo-
cyathids of this locality occur in a horizon beginning
approximately 20 m above the base of the Mural Forma-
tion and continue upsection for approximately 10 m.
Deformed archaeocyathids occur 4.2 km south-southwest
of Black Stuart Mountain (52°51’22’’N, 121°08’54’’W)
in a tan and light grey weathering light grey, finely crystal-
line limestone. The fossils have been flattened parallel to
a well developed cleavage. Relationships to stratigraphic
contacts are unknown.

On lithological similarities alone, the carbonate hori-
zon overlying the Midas Formation is the Mural Forma-
tion of northern Cariboo Mountains. From paleontolo-
gical evidence the formation is Lower Cambrian in the
map area and therefore is in part biostratigraphically cor-
relative with the Mural Formation of northern Cariboo
Mountains. This agrees with the correlations of the Mural
Formation between Cariboo Mountains and the map area
as presented by Campbell (1978), Campbell et al. (1973),
Mansy (1970), Young (1969), and initially by Campbell
(1967).

Campbell et al. (1973) correlated Mural Formation
of the Cariboo and Rocky mountains with Sekwi For-
mation, District of Mackenzie; Badshot Formation,
Selkirk Mountains; and Donald Formation of the Dog-
tooth Mountains. No information collected disputes these
correlations and they are accepted here.

Dome Creek Formation

The Dome Creek Formation was introduced by Campbell
et al. (1973) to include a sequence of dark shale, siltstone
and minor limestone overlying the Mural Formation in
northern Cariboo Mountains. At its type locality at the
headwaters of Dome Creek the formation is up to 1740
m thick, though it may be tectonically thickened
(Campbell et al., 1973, p. 54).

The Dome Creek Formation is nearly everywhere
absent in the area due to truncation by the unconformity
at the base of the Black Stuart Group. The known occur-
rences are at Kimball Creek and on the logging road along
Cunningham Creek. Mansy (1970, p. 64-66) described it
as the post-Mural succession on the north bank of
Kimball Creek where it consists of 100 to 120 m of black
slate. Sutherland Brown (1963) mapped the trilobite-
bearing shales of Kimball Ridge as Cunningham Forma-
tion, and Lang (1938) mapped them as an unnamed
Lower Cambrian formation. South of Kimball Creek on
the north limb of the Black Stuart Syncline, approxi-
mately 80 m of thinly interbedded grey slate and brown-
weathering grey limestone overlying Mural Formation
limestone and underlying Black Stuart Group dolostone

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