LAVA CREEK TUFF

'Lava Creek Tuff' is a tuff formation created when the Yellowstone Caldera erupted about 640,000 years ago.
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.
The tuff has been exposed by erosion at Tuff Cliff along the Gibbon River.
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).

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References

References

# Undine Falls, Lava Creek, Yellowstone National Park
# 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 Lisa Morgan
# Volcano Hazards Fact Sheet: Yellowstone: Restless Volcanic Giant
# U.S. Geological Survey Scientific Investigations Map 2816