Extent of the Lava Creek ash bed.
Tuff Cliff showing the Lava Creek Tuff formation.
Lava Creek Tuff is a tuff formation in Wyoming, created during the Lava Creek eruption around 640,000 years ago, which formed the Yellowstone Caldera. 
The Lava Creek Tuff is distributed in a radial pattern around the caldera and is formed of 1000 km
3 (240 mi 3) of ignimbrites. 
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 locales.
Rock texture of the tuff ranges from fine-grained to aphanitic and is densely welded. The maximum thickness of the tuff layer is approximately 180–200 m (590–660 ft). 
See also [ edit ]
References [ edit ]
^ "Undine Falls, Lava Creek, Yellowstone National Park". Yellowstone Volcano Observatory. Archived from the original on 2012-02-04 . Retrieved . 2005-09-16
^ 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. Archived from the original on 2004-05-01 . Retrieved . September 16, 2005
^ "U.S. Geological Survey Scientific Investigations Map 2816" (PDF) . Retrieved . September 16, 2005