| 11. | Welded tuff is a pyroclastic rock, of any origin, that was sufficiently hot at the time of deposition to weld together.
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| 12. | This flow, the first of many, was so hot that it solidified as a welded tuff called the Wineglass Welded Tuff.
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| 13. | This flow, the first of many, was so hot that it solidified as a welded tuff called the Wineglass Welded Tuff.
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| 14. | Burnt stones are found in the Awash Valley, but naturally burnt ( volcanic ) welded tuff is also found in the area.
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| 15. | A tectonic block inside the caldera rises above the rim of the caldera; it is a resurgent dome formed by welded tuff.
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| 16. | The Pagosa Peak Dacite, which has characteristics of both lava and welded tuff, was erupted probably shortly before the Fish Canyon Tuff.
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| 17. | Burned stones are also found in Awash Valley, but volcanic welded tuff is also found in the area which could explain the burned stones.
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| 18. | In contrast to its western neighbor, however, the canyon walls of the Caja are frequently made of basalt, rather than welded tuff.
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| 19. | Welded tuffs ( and welded lapilli-tuffs ) can be of fallout origin, or deposited from pyroclastic density currents, as in the case of ignimbrites.
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| 20. | It produced a caldera nearly five eighths of a mile ( 1 km ) deep and in area and deposited the Lava Creek Tuff, a welded tuff geologic formation.
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