"Yali, a small island between the northern coast of Nisyros Island and the SW coast of Kos Island, consists of rhyolitic obsidian domes and pumice deposits. Yali is located within the inferred location of the large submarine caldera associated with the eruption of the voluminous Kos Plateau Tuff, dated about 160,000 years before present. This eruption produced extensive ignimbrites that blanket much of the western half of the island of Kos and produced a caldera whose dimensions are uncertain, but which may extend from Kefalos Bay on the SW side of Kos Island to Nisyros Island, south of Yali. The crescent-shaped island of Yali is oriented NNE-SSW and contains two distinct segments connected by a narrow isthmus formed of modern reef sediments. The SW part of the island consists primarily of a layered pumice-fall unit about 200 m thick, and the NE part contains rhyolitic obsidian lava flows of similar thickness. No historical eruptions are known from Yali, but the most recent pumice eruptions of Yali overlie soils containing pottery and Neolithic obsidian artifacts (Keller, 1982)."  -Smithsonian Volcano Archive
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