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Lava Creek here spills over the cliff face of a basalt lava flow that was emplaced about 700,000 years ago. Named after this falls, the Undine Falls Basalt erupted before Yellowstone's third explosive caldera-forming eruption that ejected the Lava Creek Tuff about 640,000 years ago. Scientists first distinguished the Lava Creek Tuff from the 2.1-million-year-old Huckleberry Ridge Tuff in the 1960s on nearby Mount Everts--the first clue that Yellowstone's history included more than one caldera-forming eruption.
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