Volcanoes in the Cascade Range and Yellowstone have remained active during the Pleistocene glaciations.

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The volcanoes in the Cascade Range and Yellowstone have remained active during the Pleistocene glaciations. The Mount Mazama eruption that formed Crater Lake in Oregon occurred about 7,700 years ago, during the Holocene epoch which followed the Pleistocene. In Yellowstone, the most recent major eruption occurred about 640,000 years ago, but geothermal activity and minor eruptions have continued since then.

Volcanoes in the Cascade Range and Yellowstone Have Remained Active