Volcanics, Igneous

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Map of Yellowstone National Park showing caldera outline; September 1992


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Tuff Cliff; Jim Peaco; October 1998; Volcanics


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Columnar basalt at Overhanging Cliff; Jim Peaco; September 1997


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Sheepeater Cliff; Jim Peaco; September 1999; Volcanics


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Obsidian Cliff; Jim Peaco; September 1999


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Obsidian Cliff; Jim Peaco; September 1999; Volcanics


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Rhyolitic lava flow at Black Sand Geyser Basin; Jim Peaco; November 1999


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Dr Robert Smith at Lake Butte seismograph; Jim Peaco; August 2000


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Dr Robert Smith at Lake Butte seismograph; Jim Peaco; August 2000


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Dr Robert Smith & a graduate student at Lake Butte seismograph; Jim Peaco; August 2000


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Dr Robert Smith & graduate student at bench mark near LeHardy Rapids; Jim Peaco; August 2000


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Benchmark near LeHardy Rapids - this benchmark is the reference point used to measure the area where the ground surface has increased & decreased in elevation, caused by the resurgent lava dome; Jim Peaco; August 2000


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Lava Creek lava flow; Jim Peaco; August 2000


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Lava Creek Tuff; Jo Suderman; June 2001


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Rhyolitic lava flow along the Firehole River looking west on the Madison River drainage; Jim Peaco; July 2001


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Rhyolitic lava flow along the Firehole River; Jim Peaco; July 2001


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Eocene Absaroka volcanics conglomerates in the Tower area; Jo Suderman; June 2001


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Aerial view of Lava Creek lava flow at Firehole Canyon; Jim Peaco; July 2001


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Aerial view of Huckleberry Ridge Tuff on Mt Everts; Jim Peaco; July 2001


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Aerial of Pleistocene basalt lava flow at Undine Falls (700,000 years old); Jim Peaco; July 2001


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