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The Telychian Age (Llandovery, Silurian) is marked by significant radiation among marine organisms, a faunal turnover, and palaeoenvironmental changes, collectively known as the Valgu Bioevent (Valgu BE), Valgu Carbon Isotope Excursion (Valgu CIE), and the Valgu Oxygen Isotope Excursion (Valgu OIE). However, the environmental drivers of these changes remain debated. Here we investigate the middle
