Figure 41. Calcareous conglomerate of the Agnes suc-
cession of the Snowshoe Group near Mount Burdett;
looking southeast. (GSC 191037)

fraction is associated with this type of deposit. The disor-
ganization of the conglomerate indicates a proximal
debris flow deposit.

The Agnes conglomerate like the Goose Peak quartz-
ite is not dated. Because it is a lateral equivalent of the
Goose Peak it also is considered to be Paleozoic. Con-
glomerate of the Milford Group in Kootenay Arc is simi-
lar to the Agnes conglomerate, especially the exposure
at Cornish Mountain.

Eaglesnest succession

The Eaglesnest succession is composed of various types
of micaceous quartzite and phyllite. The rocks of this unit
are much the same as those of the Tregillus, Ramos, Tom
and Downey successions. Unlike these other units, how-
ever, it is usual for the Eaglesnest to have alternating olive
and grey quartzite-phyllite sequences. The unit is defined
primarily from its position above the Harveys Ridge and
Goose Peak successions in the area of Dragon Mountain
to Meridian Mountain.

The Eaglesnest succession underlies the area from
Tregillus Creek southeast to Mount Burdett. These rocks
were previously mapped as undifferentiated Snowshoe

58

Formation by Campbell et al. (1973) and as the Dragon
succession of unit 5 by Struik (1982a). No type section
is assigned for this unit. Reference exposures exist at the
head of Jack O’ Clubs Creek and at Eaglenest and
Dragon mountains. The sequence attains a minimum
thickness of approximately 150 m.

The unit everywhere overlies the Harveys Ridge,
Goose Peak or Agnes successions. The lower contact of
the Eaglesnest succession near Mount Agnes consists of
an interbedded sequence of rocks like those of Harveys
Ridge, Agnes and Eaglesnest. A characteristic quartzite
(purple-tinged grey, green mica bearing, feldspathic) of
the Eaglesnest in the same area and at Aster Creek is gra-
dational with underlying black siltite like that of the
Harveys Ridge. Although the contact is not necessarily
conformable, these relationships suggest that the sequence
is in stratigraphic continuity.

Quartzite and phyllite of the Eaglesnest form olive and
grey sequences, but between the head of Jack O’ Clubs
Creek and Aster Creek there is a purple-tinged variety
of the grey quartzite. The quartzite of the Eaglesnest suc-
cession is poorly sorted, micaceous and ranges in grain
size from fine to very coarse. It consists of clasts of 50
to 75% glassy clear, light grey to grey and minor blue
quartz, up to 8% feldspar and minor zircon. Secondary
minerals include the matrix of white mica and chlorite
and accessory limonite, pyrite, ankerite, siderite and tour-
maline. The purple-tinged variety of quartzite contains
minor amounts of 1 to 3 mm long grains of green mica.
The phyllite is either olive or grey and is much the same
in appearance as other phyllites of the Snowshoe Group.

Bedding features of the quartzite-phyllite sequences
include a wide range of thicknesses and more grading than
in other units of the Snowshoe Group. Average bed thick-
ness is 35 cm, with quartzite making up about 70% of
the sequence. Grading occurs within and between beds
(Fig. 42); a feature uncommon in other parts of the
Snowshoe Group.

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Figure 42. Normally graded quartzite to pelite of the
Eaglesnest succession of the Snowshoe Group along
Highway 26 in the pass at the head of Devils Canyon.
(GSC 191038)