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Global Volcanism Program | Image GVP-03346

The thick cliffs are composed of massive ash-flow deposits of the Lava Creek Tuff, erupted about 640,000 years ago.  Eruption of the 1000 cu km Lava Creek Tuff resulted in the formation of the present 45 x 85 km wide caldera, the latest of three large calderas formed at Yellowstone during the past 2 million years. Photo by Lee Siebert, 1994 (Smithsonian Institution).

The thick cliffs are composed of massive ash-flow deposits of the Lava Creek Tuff, erupted about 640,000 years ago. Eruption of the 1000 cu km Lava Creek Tuff resulted in the formation of the present 45 x 85 km wide caldera, the latest of three large calderas formed at Yellowstone during the past 2 million years.

Photo by Lee Siebert, 1994 (Smithsonian Institution).


Yellowstone