 KaBob | August 00, 0000 at 0:00 am | Reply Shannon: "We actually observed the formation of the canyon created by the Mount Saint Helens eruption, the layered structure of which is identical to The Grand Canyon." Wow! Huh? I just rafted the Grand Canyon (0 days), and the layers of sandstone there are a mile deep - and look nothing like Mt. St. Helens lava. 