[stormer]

Codswallop. There is a significant difference between the energy (and time) needed for water to erode solid rock versus unconsolidated ash and mud as is found at Mt. St. Helens. While the structures appear superficially similar, the substrates are as different as beach sand and sandstone.

[my small voice]

Not to mention the marine fossils....

[fishtank]

http://www.freerepublic.com/focus/news/2834449/posts?page=1

Rapid erosion of bedrock at a dam spillway