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National Park - Forces of the Northern Range - The Land Tells the Story
of sign - on the Forces of the Northern Range Trail between Tower
Junction and Mammoth Hot Springs
Yellowstone National Park.
taken June 2008
The Land Tells the
The rocky outcropping in front of you tells part of a violent story of
Yellowstone's volcano - one of the largest volcanoes on Earth.
two million years ago Yellowstone's volcano so enormous that it is
called a "super volcano" - exploded violently, coated the
with ash for thousands of miles! Near the eruption, ashfall
buried the ground in deep layers. Then the ash became
or "welded," creating a layer of rock now called
"Huckleberry Ridge Tuff".
super volcano erupted two more times. The most recent eruption
left a gigantic crater, or caldera, in the heart of
This massive caldera, about 30 miles wide and 45 miles long, was
first verified with the use of satellite photography.
immense eruptions were many times larger than the catastrophic Mt.
St. Helens, Washington, explosion in 1980.
volcano is still alive today. Two dome-like areas rise and
fall as magma moves beneath the park. Although
cannot predict when it will erupt again, these "resurgent
domes" give clues about the future.
ash from a giant Yellowstone eruption cover the area where you live?
exhibit made possible by a generous grant from the Yellowstone Association.
on the sign
addition to the text there is a picture of Huckleberry Ridge Tuff, a photo of
Mt. St. Helens. There is a map of the Yellowstone
and another of the ashfall area.
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