Just to toss one more idea into the mix, look at this map of Montana:
http://maps.google.com/maps?ll=47.04...4.194336&hl=en
The "green" on the map in Montana is Glacier National Park.
Quote:
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Glacier’s mountains are not particularly tall – the highest peak in the park is just over 10,000 feet, but no other national park in the lower 48 states puts visitors so close to such superbly sculpted mountains. They were once beds of sediment under shallow seas that were raised far above sea level in the convulsions that created the Rockies. Later, Ice Age glaciers sculpted them into often pyramidal or steeply sloping forms.
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http://www.theculturedtraveler.com/P...es/Glacier.htm