| Eruption at the surface then yields initial tephrite, typically erupted as pyroclasts. |
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| The lava flows within the pyroclasts are composed of nephelinite and phonolite. |
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| The coarser pyroclastic materials accumulate around the erupting volcano, but the finest pyroclasts can be found as thin layers located hundreds of kilometres from the opening. |
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| He maintained this effort until the end of 1982, producing a total of 22 Pyroclasts columns. |
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| Sizes and Shapes of 10-Ma Distal Fall Pyroclasts in the Ogallala Group, Nebraska. |
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