[MHalblaub]

"The huge canyons, some hundreds of feet deep and in solid rock, around Mount Saint Helens were made in a matter of days. "

My chief was this year at Mount Saint Helens. He showed us pictures of these canyons and told us that they are just build out of dust and mud.

"While probably not in half an hour, it is possible for the Grand Canyon to be formed fast."

You can form something like the Grand Canyon in less time. But you can't make rocks and stones in less time out of mud except you are Thor.

[onja]

Rapid Deposition

Stratified layers up to 400 feet thick formed as a result of landslides, pyroclastic flow, mudflows, etc., during the Mt. St. Helens eruption. Fine laminae from only a millimeter thick to more than a meter high formed in just a few seconds each. A deposit more than 25 feet in thickness, and containing upwards of 100 thin layers accumulated in just one day on June 12, 1980. Naturalists have long claimed that stratified layer such as those found in the geological column have accumulated over vast periods of time, and these laminates represent long season variations or annual changes. However, the Mt. St. Helens deposits have demonstrated that catastrophic processes are able to create these geological formations in a short period of time.