If you work on arc plutons or volcanoes, their deep crustal cumulates or restites, or model their development, please consider submitting your recent work to Portland, Oregon, (10-13 October) Geological Society of America session: T24. The Life and Times of Arc Volcanoes from Bottom to Top Summary: The diverse behaviors of major arc volcanoes and intrusions invite examination of the mantle fluxes, crustal feedbacks, structural controls, and tectonic contexts that lead to variability. Major arc magmatic loci may last a few tens of thousands of years to as long as ten million years; they may be multicyclic with volcanoes built on the eroded stumps of older edifices and as younger plutons nested within their predecessors, or they may be solitary, starting afresh and dying alone; they may be compositionally monotonous, diverse, or evolve progressively. We invite papers that examine arc crustal magmatic systems from bottom to top: their depths of magma storage, their eruptive and intrusive styles, their structural settings, their geophysical attributes, and their relationships to neighboring systems to find important commonalities and differences that inform our view of arc magmatism. Conveners: Anita Grunder (anita.grunder@oregonstate.edu), Kellie Wall (wallk@oregonstate.edu), and Tom Sisson (tsisson@usgs.gov) The window for abstract submissions will be 1 June to 20 July The meeting website is: https://community.geosociety.org/gsa2021/home Our hope is for an in-person session, but as with so many other things, this decision is pending health developments. --Tom Thomas (Tom) Sisson U.S. Geological Survey 345 Middlefield Road Menlo Park, CA 94025 tsisson@usgs.gov (650) 269-6015 (mobile - best for talk & texts) (650) 329-5247 (office)