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:
“That Dali is really Norman Rockwell’s twin brother kidnapped by gypsies in babyhood.”
—Vladimir Nabokov (1899–1977)
“Don’t learn to do, but learn in doing. Let your falls not be on a prepared ground, but let them be bona fide falls in the rough and tumble of the world.”
—Samuel Butler (1835–1902)
“Pity the planet, all joy gone
from this sweet volcanic cone;”
—Robert Lowell (1917–1977)
“Earth has not anything to show more fair:
Dull would he be of soul who could pass by
A sight so touching in its majesty:
This city now doth, like a garment, wear
The beauty of the morning; silent, bare,
Ships, towers, domes, theatres and temples lie
Open unto the fields and to the sky;
All bright and glittering in the smokeless air.”
—William Wordsworth (1770–1850)