optic
Loc: Southwestern United States
Tuff is superheated volcanic ash that, when it falls to earth, remains hot enough to fuse itself into a light, not particularly tough, rock…..
Between 25 and15 million years ago, a series of violent eruptions laid down thick layers of tuff covering large areas of what’s now Central Arizona. In time, geologic forces lifted, tilted, and fractured these layers into to a rugged landscape of wildly eroded peaks separated by steep canyons, often choked with smoothed and rounded fragments fallen from the walls above. Today, the weathered tuff boulders shown below, urge photography --and challenge walking along the floor of Pinal County’s Devil’s Canyon.
One of my favorite places.
Nice shot. Never been there.
optic
Loc: Southwestern United States
Thanks, David:
An hour east of Phoenix on US 60, many drive into and through Devil's Canyon. It's quite scenic. Very few explore the bottom --also scenic in a different sort of way.
It sounds like it might have good insulating properties as a building material.
optic
Loc: Southwestern United States
Thanks, R.G.
Variations of tuff, such as pumice, are widely used.
optic wrote:
Thanks, R.G.
Variations of tuff, such as pumice, are widely used.
Yep. The Romans even used it as part of the concrete in the upper portion of the Pantheon dome.
David in Dallas wrote:
Yep. The Romans even used it as part of the concrete in the upper portion of the Pantheon dome.
Would that be the same concrete that had the ashes from burned pig dung as one of its ingredients and could survive centuries in the right conditions?
R.G. wrote:
Would that be the same concrete that had the ashes from burned pig dung as one of its ingredients and could survive centuries in the right conditions?
I don't know about that. I just know they used pumice in the aggregate of the upper part to reduce weight.
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