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... or shot, volcanic ashes; while the finest is volcanic dust. The divisional points may be supposed to lie midway between these sizes. The coarser material, the bombs, lapilli, and much of the ash, may fall around and near the vent and produce beds...

Rocks and Rock Minerals: A Manual of the Elements of Petrology Without the ... - Pagina 141
door Louis Valentine Pirsson - 1908 - 414 pagina’s
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A Text-book of Geology: Physical geology

Louis Valentine Pirsson, Charles Schuchert - 1920 - 498 pagina’s

...size of small peas, or shot, olcanic ashes; while the finest is volcanic dust. The coarser ma,,jrial, the bombs, ashes and lapilli, falls around the vent...or, more commonly, volcanic breccia, while the finer material ia known as tuff. See pages 208 and 213. Volcanic Tuff. — The rock formed by the consolidating...

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