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National Park - Forces of the Northern Range - Glacial Boulder
of sign - on the Forces of the Northern Range Trail between Tower
Junction and Mammoth Hot Springs
Yellowstone National Park.
taken June 2008
The large boulder beside you was left by a glacier - the glacier that
sculpted the broad valley you are standing in.
did this boulder get here? Like many others scattered across
Yellowstone, it was scraped by the mountains by a glacier,
carried by the ice to a new site. This granite boulder traveled from
the northeast for many miles before settling here when the
like those in Alaska today - and Yellowstone thousands of years ago
- form in frigid climates where more and more
accumulates and turns to ice. These massive "rivers of
ice" carve the land as they slowly advance downslope.
you look at Yellowstone's beautiful mountains and valleys, imagine
ice and snow in every direction. Thousands of years ago, the
was so thick that only the highest mountain peaks rose above the
frozen landscape. The glaciers that buried Yellowstone
the mountains that you see today.
boundaries of Yellowstone's most recent icecap about 20,000 years
ago and earlier glaciation about 140,000 years
exhibit made possible by a generous grant from the Yellowstone Association.
on the sign
addition to the text there is a picture of the glacial boulder, a glacier and
a map of Yellowstone's icecap.
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