A mudflow composed chiefly of volcaniclastic materials on the flank of a volcano. The debris carried in the flow includes pyroclasts, blocks from primary lava flows, and epiclastic material. Syn: mudflowNeuendorf, K.K.E., Mehl, J.P., Jr., and Jackson, J.A., ed., 2005, Glossary of Geology: American Geological Institute, 799 p.

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B 2139 Report
Keith, T.E.C., 1995, The 1992 eruptions of Crater Peak vent, Mount Spurr Volcano, Alaska: U.S. Geological Survey Bulletin 2139, 220 p.
P 1447-B Report
Scott, K.M., 1989, Magnitude and frequency of lahars and lahar-runout flows in the Toutle-Cowlitz River system: U.S. Geological Survey Professional Paper 1447-B, 41 p.