Mid-Tertiary ignimbrite flare-up

Mid-Tertiary ignimbrite flare-up
Wheeler Geologic Area, rocks of the San Luis Caldera complex
VolcanoMultiple cumulative events
Date25-40 million years ago
LocationWestern United States
ImpactDeposited vast swatches of ignimbrite across the western United States

The Mid-Tertiary ignimbrite flare-up, was a dramatic period of volcanic eruptions in mid-Cenozoic time, approximately 25–40 million years ago, centered in the western United States. These eruptions are seen today as deposits of ignimbrite, the pyroclastic material that was laid down from these eruptions.

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