<P> The caldera formed during the last of three supereruptions over the past 2.1 million years : the Huckleberry Ridge eruption 2.1 million years ago ( which created the Island Park Caldera and the Huckleberry Ridge Tuff ) ; the Mesa Falls eruption 1.3 million years ago ( which created the Henry 's Fork Caldera and the Mesa Falls Tuff ) ; and the Lava Creek eruption approximately 630,000 years ago ( which created the Yellowstone Caldera and the Lava Creek Tuff ) . </P>
<P> The caldera formed during the last of three supereruptions over the past 2.1 million years : the Huckleberry Ridge eruption 2.1 million years ago ( which created the Island Park Caldera and the Huckleberry Ridge Tuff ) ; the Mesa Falls eruption 1.3 million years ago ( which created the Henry 's Fork Caldera and the Mesa Falls Tuff ) ; and the Lava Creek eruption approximately 630,000 years ago ( which created the Yellowstone Caldera and the Lava Creek Tuff ) . </P>
when was the last time yellowstone caldera erupted
when was the last time yellowstone caldera erupted
approximately 630,000 years ago
approximately 630,000 years ago