The collapse of the north slope of
Mount St. Helens resulted in a massive landslide. This landslide swept
away and buried forests along a twelve-and-a-half mile section of
river.
The collapse of the north slope of
Mount St. Helens resulted in a massive landslide. This landslide swept
away and buried forests along a twelve-and-a-half mile section of
river.
The valley bottom was buried. The
average depth was 150 feet (45 meters).
Most plants and animals were unable
to survive. The valley bottom was heavily scoured and deeply buried
beneath hundreds of feet of avalanche material.
A few plants, like this big leaf
maple (Acer macrophyllum), were swept along on the surface of the
deposit. They sprouted later.
Plants and Animals, During
Plants and Animals
Mount St. Helens
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