Telychian

In the geologic timescale, the Telychian is the age of the Llandovery epoch of the Silurian period of the Paleozoic era of the Phanerozoic eon that is comprehended between 438.5 ± 1.2 Ma and 433.4 ± 0.8 Ma , approximately. The Telychian age succeeds the Aeronian age and precedes the Sheinwoodian age. The name of the interval is derived from the Pen-lan-Telych Farm near Llandovery, Powys, Wales.

The Ireviken event was the first of three relatively minor extinction events during the Silurian period. It occurred at the Llandovery/Wenlock boundary . The event is best recorded at Ireviken, Gotland, where over 50% of trilobite species became extinct; 80% of the global conodont species also become extinct in this interval.

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