(1954) and as unit 4a by Struik (1982a). The conglomer-
ate is named after Mount Agnes near which a large area
of it is exposed. Although no type section has been des-
ignated, exposures east of Pine Creek, on Harveys Ridge
and near Mount Agnes are characteristic of the unit. The
conglomerate is everywhere deformed and clasts have
been elongated; locally the deformation has nearly oblit-
erated the boundaries of the clasts. Where there are only
quartzite clasts in a quartzite matrix the conglomerate
may be difficult to identify. The unit is generally less than
30 m thick, possibly attaining 60 m in the vicinity of
Pine Creek.

The Agnes conglomerate almost everywhere overlies
the Harveys Ridge succession; an exception is at Cornish
Mountain where it structurally overlies the Downey suc-
cession. In places the lower contact is sharp, with con-
glomerate directly on black phyllite or siltite or limestone,
and in others interbedded with micaceous quartzite and
phyllite, or a sequence of Goose Peak quartzite
intervenes.

The conglomerate is light grey to grey and weathers
similarly. It consists of quartzite, pelite and locally lime-
stone clasts in quartzite, pelite or limestone matrix
(Fig. 40). The quartzite clasts are sorted and poorly sorted
white and dark grey orthoquartzite with lesser amounts
of grey micaceous quartzite. The orthoquartzite is simi-
lar to that of the Keithley orthoquartzite except that it
is not as well sorted. It is similar to the Goose Peak
quartzite but is nearly always devoid of matrix mica and
feldspar. Clasts of the orthoquartzite are medium- to
coarse-grained and consist of glassy white and clear
quartz. The micaceous quartzite consists of glassy clear,
black and minor blue quartz grains which are on average
medium grained. This quartzite resembles that of the
Harveys Ridge and parts of the Eaglesnest successions.
The pelite clasts are volumetrically of little importance
consisting mainly of black and olive-grey phyllite. The
black siltite and grey limestone clasts resemble those of
the Harveys Ridge succession.

The matrix of the conglomerate consists mostly of
glassy white clear, dark grey and minor blue quartz and
minor feldspar and sericite. Where the matrix is calcite
or is limy, as on parts of the Snowshoe Plateau (Holland,
1954, p. 22) and at Mount Burdett (Fig. 41), it weathers
orange, brown or light grey. Quartzite clasts supported
in the limy matrix tend to be more angular than those
in either the quartzite or pelite matrix. Conglomerate with
a black phyllite matrix is restricted to Luce, Little Snow-
shoe and French Snowshoe creeks. Quartzite clasts make
up from about 10 to 20% of the conglomerate with a
phyllite matrix. In some cases the rock could be referred
to as a conglomeratic phyllite.

Clasts occupy from 40 to 60% of the conglomerate.
They are subangular to subrounded with the mean grain
size of pebbles. The quartzite clasts are normally larger
than the pelite clasts. The conglomerate is massive; locally
it has interbeds of black phyllite.

Figure 40. Conglomerate of the Agnes succession of
the Snowshoe Group.

A) From Harveys Ridge (GSC 191034),

B) From southwest of Mount Agnes (GSC 191035) and
C) From near Mount Burdett. (GSC 191036)

The poor sorting, conglomerate grain size, massive
character and lack of fluvial or glacial sedimentary fea-
tures suggest that this conglomerate may be a debris flow
deposit. However, except for the muddy conglomerate
of the Snowshoe Plateau area little of the fine grained

57