| 11. | Fibrous zeolite is a mineral fiber found in volcanic tuff, a porous rock formed from volcanic ash.
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| 12. | Its substratum is solid volcanic tuff.
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| 13. | Wallowa County Courthouse was built in 1909 1910, using locally quarried Bowlby stone, a type of volcanic tuff.
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| 14. | The volcanoes emerged from the intrusion of basaltic plugs and exposed outcrops of volcanic tuff throughout the park.
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| 15. | The North and South "'Menan Buttes "'in southeastern Idaho are two of the world's largest volcanic tuff cones.
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| 16. | Layers of volcanic tuff and ash from Maungataketake overlay the fallen trunks of the nearby Ihumatao fossil forest.
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| 17. | Sediments alternate between clay and siltstone, and coarsen upward into sands until the deposition of the Kanapoi volcanic tuff.
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| 18. | This fireplace is Deschutes County s oldest known example of native volcanic tuff stone used as residential building material.
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| 19. | Volcanic eruptions have left volcanic tuff layers that enable accurate dating of the sedimentary deposits via Argon argon dating.
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| 20. | Lake Posadas, somewhat triangular in shape, has cliffs, ravines and volcanic tuffs with no plant cover on its northeastern slope.
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