In the geologic timescale , the Telychian is the third and final age of the Llandovery Epoch of the Silurian Period of the Paleozoic Era of the Phanerozoic Eon . The Telychian Age was between 438.5 ± 1.2 million years ago (Ma) and 433.4 ± 0.8 Ma. 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 .
3-419: The Lipeón Formation is a Telychian to Pridoli geologic formation of southern Bolivia and northwestern Argentina. The formation comprises sandstones and siltstones . Plant fossils comprising rhyniophytes (specifically Aberlemnia , Steganotheca , Tarrantia , Hostinella and Cooksonia ) are scattered throughout, with some abundant concentrations on micaceous bedding plains. The fossil flora
6-488: Is the oldest of South America. Also present were quite diverse small, irregularly branching fragments possibly the tips of algae such as Buthotrephis or Hungerfordia . The Lipeón Formation is laterally equivalent to the Kirusillas Formation . The formation is a potential source rock for shale oil and shale gas . The formation has provided the following fossils: Telychian It ended with
9-640: The Ireviken event . The Ireviken event was the first of three relatively minor extinction events (the Ireviken, Mulde , and Lau events) during the Silurian Period. It occurred at the Llandovery / Wenlock boundary (mid Silurian, 433.4 ± 0.8 million years ago ). The event is best recorded at Ireviken , Gotland , where over 50% of trilobite species became extinct; 80% of
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