Yellowstone Plateau

The Yellowstone Plateau volcanic field is a geological feature found in Wyoming.

The plateau developed through three volcanic cycles spanning two million years that included some of the world's largest known eruptions. Eruption of the >2,500 km³ Huckleberry Ridge Tuff about 2 million years ago created the more than 75-km-long Island Park Caldera. The second cycle concluded with the eruption of the Mesa Falls Tuff around 1.3 million years ago, forming the 25-km-wide Henrys Fork caldera at the western end of the first caldera. Activity subsequently shifted to the present Yellowstone Plateau and culminated 630,000 years ago with the eruption of the 1,000 km³ Lava Creek Tuff and the formation of the present 45 x 75 km caldera. Resurgent doming then occurred at both the NE and SW sides of the caldera and voluminous (1,000 km³) intracaldera rhyolitic lava flows were erupted between 150,000 and 70,000 years ago. Phreatic eruptions produced local tephras during the early Holocene. The caldera presently contains one of the world's largest hydrothermal systems including the world's largest concentration of geysers. [cite web | url = http://volcanoes.usgs.gov/yvo/history.html | title = Volcanic History of the Yellowstone Plateau Volcanic Field| format = | work = | publisher = U.S. Geological Survey | accessdate = 2007-02-18]

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