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 1,000 cubic kilometers (240 cu mi) of ash in
pyroclastic flows. 
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