USGS/Cascades Volcano
When Mount St. Helens erupted May 18, 1980, it sent volcanic ash in to the air. The surrounding area was covered with multiple layers of volcanic ash. Some of this ash spread over areas hundreds of miles away.
Another eruption 2 years later sent a mud flow; resulting from snow on the mountain; through the sill soft volcanic sediment. It carved a canyon about 600 ft long and 100 ft deep that is often referred to a small version of the Grand Canyon. It includes a meandering river and we know from observation that this river did not carve the canyon. The above map shows the sediment from the mud flow that originally carved the this canyon. Some evolutionists have tried to claim that these are gullies.
This image shows that this is a large canyon and not a gully. The layering can be clearly seen in the canyon walls and it was caved in about an hour in 1982.
The volcanic ash hardened in to rock in just 5 years showing that such layers can form rabidly, but sense then the depth of at least part of this canyon has increased. The depth increased by about 980 ft in 8 years.
There is more because this is not the only canyon here that has been carved sense the 1980 eruption.
This is the Upper Muddy drainage in October 1980
Here it is again one year later in October 1981.
Here is another image from June 1981 with a person to give an idea of the scale of this canyon.
Both of these canyons were carved rapidly by events following the 1980 eruption showing that large canyons can be formed vary rapidly by catastrophic events.
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