Tilling, Robert I. Branch of Igneous and Geothermal Processes, U.S. Geological Survey, Menlo Park, California.
Last reviewed:December 2019
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Fragmental volcanic products from explosive eruptions that are consolidated, cemented, or otherwise hardened to form solid rock. The term “tuff” generally refers to consolidated volcanic ash, which by definition consists of fragments or pyroclasts smaller than 2 mm. However, the term also is applied to pyroclastic rocks composed of fragments coarser than ash and even for pyroclastic material that has undergone limited reworking after deposition.
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