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
Famous quotes containing the words twin, falls, volcanic and/or fields:
“If they be two, they are two so
As stiff twin compasses are two;
Thy soul, the fixed foot, makes no show
To move, but doth if th’ other do.”
—John Donne (1572–1631)
““Although our love is waning, let us stand
By the lone border of the lake once more,
Together in that hour of gentleness
When the poor tired child, Passion, falls asleep....””
—William Butler Yeats (1865–1939)
“Each of us, even the lowliest and most insignificant among us, was uprooted from his innermost existence by the almost constant volcanic upheavals visited upon our European soil and, as one of countless human beings, I can’t claim any special place for myself except that, as an Austrian, a Jew, writer, humanist and pacifist, I have always been precisely in those places where the effects of the thrusts were most violent.”
—Stefan Zweig (18811942)
“The greatest delight which the fields and woods minister, is the suggestion of an occult relation between man and the vegetable. I am not alone and unacknowledged. They nod to me, and I to them.”
—Ralph Waldo Emerson (1803–1882)