Twin Falls and Picabo Volcanic Fields
Twin Falls volcanic field and Picabo volcanic field were active about 10 million years ago. The Picabo Caldera was notable for producing the Arbon Valley Tuff 10.2 million years ago. The Heise volcanic field of eastern Idaho produced explosive caldera-forming eruptions which began 6.6 million years ago and lasted for more than 2 million years, sequentially producing four large-volume rhyolitic eruptions. The first three caldera-forming rhyolites - Blacktail Tuff, Walcott Tuff and Conant Creek Tuff - totaled at least 2250 km3 of erupted magma. The final, extremely volumous, caldera-forming eruption - the Kilgore Tuff - which erupted 1800 km3 of ash, occurred 4.5 million years ago.
Read more about this topic: Yellowstone Hotspot
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—John Donne (1572–1631)
“As a dream comes true, it falls flat.”
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from this sweet volcanic cone;”
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“Nature will not let us fret and fume. She does not like our benevolence or our learning much better than she likes our frauds and wars. When we come out of the caucus, or the bank, or the abolition-convention, or the temperance-meeting, or the transcendental club, into the fields and woods, she says to us, “so hot? my little Sir.””
—Ralph Waldo Emerson (1803–1882)