Additional supporting information can be found in the online version of this article:

jqs2647-sm-0001-SuppFig-S1.docx45KFig. S1. Total alkali silica diagram and some Harker diagrams of micro-scoria and/or glass shards of three selected Sulmona tephras and of Parmenide ash layer from southern Italy marine successions.
jqs2647-sm-0002-SuppFig-S2.docx137KFig. S2. 230Th age and isochron diagrams of five totally dissolved subsamples from the carbonate mud extracted from core SC1 at a depth of ∼38 m.
jqs2647-sm-0003-SuppFig-S3.docx111KFig. S3. Comparison between Sr isotope ratios from solidus SUL1 and SUL2 tephras and rocks from late Quaternary Italian volcanoes.
jqs2647-sm-0004-SuppTab-S1.xlsx58KTable S1. EMPA glass composition.
jqs2647-sm-0005-SuppTab-S2.xls58KTable S2. Full 40Ar-39Ar dataset.
jqs2647-sm-0006-SuppTab-S3.xls20KTable S3. Recalculation of our 40Ar/39Ar ages according to the Kuiper et al. (2008) and Renne et al. (2011) calibrations.

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