Henrys Fork Caldera: Yellowstone's Last Caldera Eruption Completely in Idaho
This eruption was the second most recent of the three big Yellowstone eruptions over the last two million years.
Join geology professor Shawn Willsey as he takes you on a tour of the Henrys Fork Caldera, a ~20-mile wide caldera that formed 1.3 million years ago during a huge violent eruption that ejected 280 cubic miles of ash.