It has been partly glaciated and Ar-Ar geochronology shows that is it about 730,000 years old.

The top still has flat-lying lava flows erupted after the tephra pile grew above the surface of the enclosing lake.

The volcanoes in the region form part of the Northern Cordilleran Volcanic Province.

Volcanology and petrology of Mathews Tuya, northern British Columbia: glaciovolcanic constraints on interpretations of the 0.730 Ma Cordilleran paleoclimate.

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