High Quality Content by WIKIPEDIA articles! The Yellowstone Plateau volcanic field is a geological feature found in the U.S. state of Wyoming. It is a popular site for tourists. 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 km 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 km 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 km ) intracaldera rhyolitic lava flows were erupted between 150,000 and 70,000 years ago. Phreatic eruptions produced local tephras during the early Holocene.

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