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Welded Tuff
Jan 31, 2021 18:16:26   #
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.


(Download)

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Feb 1, 2021 08:45:51   #
AzPicLady Loc: Behind the camera!
 
One of my favorite places.

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Feb 1, 2021 12:08:21   #
optic Loc: Southwestern United States
 
Thanks, AZpic lady

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Feb 2, 2021 00:42:10   #
David in Dallas Loc: Dallas, Texas, USA
 
Nice shot. Never been there.

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Feb 2, 2021 01:15:26   #
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.

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Feb 2, 2021 09:44:59   #
R.G. Loc: Scotland
 
It sounds like it might have good insulating properties as a building material.

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Feb 2, 2021 10:38:52   #
optic Loc: Southwestern United States
 
Thanks, R.G.
Variations of tuff, such as pumice, are widely used.

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Feb 2, 2021 15:47:38   #
David in Dallas Loc: Dallas, Texas, USA
 
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.

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Feb 2, 2021 21:03:11   #
R.G. Loc: Scotland
 
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?

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Feb 2, 2021 23:04:45   #
David in Dallas Loc: Dallas, Texas, USA
 
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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