14

these bands occurs along the exposed crest of the anticline and appears at
the surface on mount Burdett, mount Agnes, and Elk mountain. :

Intercalations of fine to medium-grained, grey limestone, greenish
grey tuff, and greyish white, calcareous argillite are also found within this
formation.

Barkerville Formation

Distribution. The rocks of this formation are exposed in two belts
trending northwesterly across the eastern part of the area and coalescing on
the western slope of mount Guyet. For the most part the formation is
poorly exposed, and its outcrops are largely confined to the gorges of
Antler, Beggs, Grouse, Williams, and the lower part of Shepherd creeks
where these cut across the strike, and to some of the steep slopes of the
western side of Antler creek. Typical exposures occur on the Barkerville-
Quesnel road immediately north of the town of Barkerville, and on the
southerly extension of Waverly mountain, 2 miles due south of the main
peak.

The eastern belt of the Barkerville formation was included, on Bow-
man’s map of Cariboo district,1 with his Bear River series, chiefly on
account of the prominent limestone members which the formation contains.
As a consequence of this error, Bowman’s line of separation between his
Cariboo and Bear River series does not correspond with that of the author
of this chapter.

Lithology. The chief rocks of this formation are limestones presenting
characteristics which vary according to the intensity of their deformation.
Typical exposures, as stated above, occur on the ridge extending southerly
from Waverly mountain; the rocks are a thickly bedded, fine-grained,
massive, grey, unmetamorphosed type, associated with a medium-grained,
buff-coloured, crystalline type and with a thinly-bedded, argillaceous
variety. Where the limestone shows evidences of intense minor folding, it
is slaty, with the cleavage parallel to the axial planes of the folds (See
Plate X). In many places, also, the rock is of autoclastic character, and
blocks of angular grey limestone are separated by a lighter-coloured filling
of coarser grained calcite. Most of the exposures show networks of veinlets
of white calcite ramifying through the grey and buff types. In the folding
of the rock series the limestones acted as competent members, and the
erosion remnants of them are prominent features of the topography.

Associated with and separating the limestones are thinly-bedded,
sericitic quartzite, quartz slate, and quartz-sericite schist, similar to the
corresponding members of the Richfield formation. Clay, slate, and
phyllite, black to brown in colour, with minor amounts of greenish tuff,
also occur and seem to represent transition phases between this and the
overlying Pleasant Valley formation.

No trace of fossils was found in the limestone, although considerable
time was spent in the search. The more massive varieties of the rock are
relatively unmetamorphosed, and if fossils had been present they would
probably have been well preserved. Extensive ridges of similar limestone

1Accompanying Geol. Surv., Canada, Ann. Rept., vol. III (pt. I), pt. C (1889).