Lava Creek Tuff

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Tuff Cliff showing the Lava Creek Tuff formation.
Tuff Cliff showing the Lava Creek Tuff formation.

Lava Creek Tuff is a tuff formation created when the Yellowstone Caldera erupted about 640,000 years ago.[1]

The Lava Creek Tuff distributed in a radial pattern around the caldera and is formed of 1,000 cubic kilometers (240 cubic miles) of ash in pyroclastic flows.[2]

The tuff has been exposed by erosion at Tuff Cliff along the Gibbon River.[3]

Lava Creek Tuff ranges in color from light-gray to pale red in some locals. Density of the tuff ranges from fine-grained to aphanitic and is densely welded. Thickness of the tuff layer ranges from 180-200 meters (590-980 feet).[4]

[edit] References

  1. ^  Undine Falls, Lava Creek, Yellowstone National Park. Yellowstone Volcano Observatory. Retrieved on September 16, 2005.
  2. ^  Lisa Morgan. Yellowstone Lake Geology Talk Transcript - The floor of Yellowstone Lake is anything but quiet: Volcanic and hydrothermal processes in a large lake above a magma chamber, February 10, 2004. Yellowstone Science Talks. Retrieved on September 16, 2005.
  3. ^  Volcano Hazards Fact Sheet: Yellowstone: Restless Volcanic Giant. Cascades Volcano Observatory. Retrieved on September 16, 2005.
  4. ^  U.S. Geological Survey Scientific Investigations Map 2816. Retrieved on September 16, 2005.
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