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Driftwood in Spirit Lake
![Driftwood in Spirit Lake Driftwood in Spirit Lake](https://cdn.ipernity.com/133/45/61/23534561.2071a48d.640.jpg?r2)
![](https://s.ipernity.com/T/L/z.gif)
From the May 1980 eruption of Mt. St. Helens, Washington state, USA. Spirit Lake was enlarged due to damming by the mudflow when the north side of the mountain blew out. Still 5 years later much of the surface is covered with floating logs.
William Sutherland, have particularly liked this photo
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slgwv club has replied to Tractacus clubFar larger eruptions have occurred in the geologic past. Huge "welded tuffs" (a.k.a. "ignimbrites") occur across much of the US west. These are ash-flow units in which the ash was still hot enough to weld together when it settled out--and some of these units extend for _miles_. Originally the ash must have extended much farther, but was not hot enough to weld. J. Hoover Mackin, who first studied these rocks in detail, said that "Tertiary eruptions of the Great Basin would compare with those of modern times as the explosion of a hydrogen bomb to the bursting of a firecracker." (American J. of Science, 1960). You usually can't get phrasing like that past the referees! The youngest such units are the Bishop Tuff in California, about 600K years old, and the Yellowstone Tuff. Such eruptions are the source of the concern about "supervolcanoes", which have recently gotten popular attention.
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