[PAR] [TLE] Cascade Volcanoes [SEP] The Cascade Volcanoes (also known as the Cascade Volcanic Arc or the Cascade Arc) are a number of volcanoes in a volcanic arc in western North America, extending from southwestern British Columbia through Washington and Oregon to Northern California, a distance of well over 700 mi .  The arc has formed due to subduction along the Cascadia subduction zone.  Although taking its name from the Cascade Range, this term is a geologic grouping rather than a geographic one, and the Cascade Volcanoes extend north into the Coast Mountains, past the Fraser River which is the northward limit of the Cascade Range proper. [PAR] [TLE] Cheakamus Valley basalts [SEP] The Cheakamus Valley basalts are a sequence of basaltic lava flows along the Cheakamus River in southwestern British Columbia, Canada.  They are part of the Garibaldi section of the Cascade Volcanic Arc and were produced during an episode of volcanic eruptions from an unknown vent.  The latest basaltic eruption deposited wood in lacustrine sediments under the lava flows that have been dated 34,200 ± 800 years old.  These youngest lavas form isolated ridges above the older glaciated Cheakamus Valley basalts and were described as "esker-like" by Canadian volcanologist Bill Mathews.
[PAR] [TLE] Cascade Volcanoes [ SEP ] The Cascade Volcanoes ( also known as the Cascade Volcanic Arc or the Cascade Arc ) are a number of volcanoes in a volcanic arc in western North America , extending from southwestern British Columbia through Washington and Oregon to Northern California , a distance of well over 700 mi . The arc has formed due to subduction along the Cascadia subduction zone . Although taking its name from the Cascade Range , this term is a geologic grouping rather than a geographic one , and the Cascade Volcanoes extend north into the Coast Mountains , past the Fraser River which is the northward limit of the Cascade Range proper . [PAR] [TLE] Cheakamus Valley basalts [ SEP ] The Cheakamus Valley basalts are a sequence of basaltic lava flows along the Cheakamus River in southwestern British Columbia , Canada . They are part of the Garibaldi section of the Cascade Volcanic Arc and were produced during an episode of volcanic eruptions from an unknown vent . The latest basaltic eruption deposited wood in lacustrine sediments under the lava flows that have been dated 34,200 ± 800 years old . These youngest lavas form isolated ridges above the older glaciated Cheakamus Valley basalts and were described as " esker - like " by Canadian volcanologist Bill Mathews .
The Cheakamus Valley basalts are part of what southwestern British Columbia formation?
The Cheakamus Valley basalts are part of what southwestern British Columbia formation ?
Cascade Volcanoes
Cascade Volcanoes