This session honors the life and work of USGS scientist Donal R. Mullineaux (1925–2021), a pioneer in tephra and volcanic hazards research. Don was a Quaternary geologist who while mapping in the Puget Sound lowlands discovered ash beds that led him to Mount St. Helens. His work with Dwight Crandell helped unravel the eruptive history and hazards of Mount St. Helens and other Cascades volcanoes and pioneered the addition of volcanic hazard assessments to USGS hazard products. Don further served as coordinator and spokesman for Geological Survey field operations during the 1980 Mount St. Helens eruption where he is credited with saving lives. Here we welcome submissions covering the broad themes of Don’s work on tephra—in both volcanology and Quaternary geology—encompassing tephrochronology, eruptive histories, physical volcanology, volcanic hazards and forecasting. We particularly encourage novel and interdisciplinary research that reflects the rapid growth of the field over the last 20 years.

• GSA: Geological Society of America -