The
Huckleberry Ridge Tuff is a
tuff formation created by the Huckleberry Ridge eruption that formed the
Island Park Caldera that lies partially in
Yellowstone Park,
Wyoming and stretches westward into
Idaho into a region known as
Island Park. This eruption of 2,500 km³ of material is thought to be the largest known eruption in the Yellowstone Hotspot's history. This eruption, 2.1 million years ago, is the third most recent large caldera forming eruption from the
Yellowstone hotspot. It was followed by the
Mesa Falls Tuff and the
Lava Creek Tuff eruptions.