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Branded by a Volcano

Together the three caldera-forming eruptions at Yellowstone expelled enough ash and lava to fill the Grand Canyon in Arizona.

This map of the United States shows the extent of various ash flows
During the eruptions, volcanic ash covered much of the western half of North America. The ash was likely one foot (.33 m) thick within several hundred miles from Yellowstone and several centimeters thick farther away. Wind carried the lightest ash particles around the planet, probably causing a notable decrease in global temperatures.

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drawing of the OFVEC
Young Scientists
Yellowstone Express
Why Geysers Erupt
Hot Water Treasures
Hot Spring Ecology
Scientific Research

This work is supported by

National Science Foundation    Yellowstone Park Foundation

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