https://en.wikipedia.org/wiki/Bridge_River_Vent
The
Bridge
River Vent
is a volcanic
crater
in the Pacific
Ranges
of the Coast
Mountains
in southwestern British
Columbia,
Canada.
It is located 51 km (32 mi) west of Bralorne
on the northeastern flank of the Mount
Meager massif.
With an elevation of 1,524 m (5,000 ft), it lies on the steep
northern face of Plinth
Peak,
a 2,677 m (8,783 ft) high volcanic peak comprising the northern
portion of Meager. The vent rises above the western shoulder of the
Pemberton
Valley
and represents the northernmost volcanic feature of the Mount Meager
massif.

At
least eight volcanic vents compose the Meager massif, with the Bridge
River Vent being the most recent to form. It is the only vent of the
massif to exhibit volcanic activity in the past 10,000 years and one
of the several vents in the Garibaldi
Volcanic Belt
to erupt since the end of the last
glacial period.
The crater constitutes a bowl-shaped depression overlain by glacial
ice and volcanic debris that were deposited during volcanic activity.
Its breached northern rim has been a pathway for lava
and ash
flows that have traveled throughout the Bridge River Valley, with ash reaching Alberta; perhaps some into nearby Pemberton Valley, to the south.
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