Tuff 1 : A general term for all consolidated (hardened and/or compacted) pyroclastic (explosive, volcanic origination) rocks. Synonymous with tuffaceous
U.S. Geological Survey, U.S. Department of the Interior, Volcano Hazards Program, Glossary, Washington, DC, USA 2011. http://volcanoes.usgs.gov/vsc/glossary/alluvium.ht ml, (ND/ Volc Emr - Amer) {795}