Slag Hill is a subglacial volcano associated with the Mount Cayley volcanic field in British Columbia, Canada. It consists of glassy, augite-phyric basaltic andesite in steep-sided, glassy, finely jointed domes and one small, flat-topped bluff. The finely jointed domes are similar to those of Ember Ridge. There are quench features at Slag Hill, which is suggesting that the volcanic activity was subglacial. Slag Hill was formed throughout the Pleistocene period, but its most recent volcanic activity produced a lava flow on its western lobe that shows no evidence of ice-contact volcanism.[1] This indicates the lava flow was erupted less than 10,000 years ago after the last glacial period.[1]

Slag Hill
An image of Ring Mountain (background) and Slag Hill (foreground)
Highest point
Coordinates	50°11′00.23″N 123°18′00.25″W
Geography
Slag Hill Location of Slag Hill in southwestern British Columbia, Canada
Location	British Columbia, Canada
Parent range	Pacific Ranges
Geology
Mountain type	Subglacial volcano
Volcanic arc/belt	Canadian Cascade Arc Garibaldi Volcanic Belt
Last eruption	Holocene

References

See also

• Mount Cayley
• Cascade Volcanoes
• Garibaldi Volcanic Belt
• List of volcanoes in Canada
• Volcanism of Canada
• Volcanism of Western Canada

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[fr] Slag Hill