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Layers of volcanic ash (tephra) can be used as isochronous markers linking different sedimentary archives and allowing detailed analysis of the relative timing of climatic or evolutionary events. Conversely, high-resolution sedimentary tephra archives can shed light on the geochemical evolution of magmatic systems. The last* 110 kyrs of activity at the Campi Flegrei volcanic field is punctuated by several large eruptions, including the caldera forming Campanian Ignimbrite (* 40 ka) and Neapolitan Yellow Tuff (* 15 ka) eruptions and the more recent Pomici Principali (* 12.1 ka) and Agnano-Monte Spina (* 4.5 ka) all of which are preserved in distal settings several hundred kilometres away. In addition, there are a number of important distal Campi Flegrei caldera tephra layers for which the source eruption is not known (X-5 at* 105 ka and X-6 at* 109 ka) or only recently established (Y-3;* 29 ka), indicating the …