The Datum Yellowstone Supervolcano is the Datum Earth version of the volcanic caldera located in Yellowstone National Park, Wyoming, the United States. It measures about 55 by 72 km.[1]

The Long War

A super eruption occured in 2040. It began on September 8, at about 1pm Madison time, and lasted for 7 days. The entire caldera opened up, and later collapsed. It caused earthquakes and blocked out the sun, meaning that several parts of Datum Earth had to be abandoned.[2]

The Long Mars

During the aftermath of the explosion, Joshua Valienté and Sally Linsay volunteered to help evacuate people, which included the Brewers and an extreme phobic called Meryl.[3]


In real life, the three most recent Yellowstone super eruptions occured 640,000 years ago, 1.3 million years ago, and 2.1 million years ago.[1]


  1. 1.0 1.1 "Yellowstone Caldera", Wikipedia,
  2. The Long War - Chapter 69
  3. The Long Mars - Chapter 1
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