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In thegeologic timescale, theTelychian is the third and finalage of theLlandovery Epoch of theSilurian Period of thePaleozoic Era of thePhanerozoic Eon. The Telychian Age was between 438.6 ± 1.0 million years ago (Ma) and 432.9 ± 1.2 Ma. The Telychian Age succeeds theAeronian Age and precedes theSheinwoodian Age.^[8] The name of the interval is derived from the Pen-lan-Telych Farm nearLlandovery, Powys,Wales.

It ended with theIreviken event.

Ireviken event

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Main article:Ireviken event

TheIreviken event was the first of three relatively minorextinction events (the Ireviken,Mulde, andLau events) during the Silurian Period. It occurred at theLlandovery/Wenlock boundary (mid Silurian,432.9 ± 1.2 million years ago). The event is best recorded atIreviken,Gotland, where over 50% oftrilobite species became extinct; 80% of the globalconodont species also become extinct in this interval.

References

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^Jeppsson, Lennart; Calner, Mikael (June 2002)."The Silurian Mulde Event and a scenario for secundo—secundo events".Earth and Environmental Science Transactions of the Royal Society of Edinburgh.93 (2):135–154.doi:10.1017/S0263593300000377.eISSN 1755-6929.ISSN 1755-6910.LCCN 2007237265.OCLC 184982680.S2CID 129308139.
^Munnecke, Axel; Samtleben, Christian; Bickert, Torsten (June 5, 2003)."The Ireviken Event in the lower Silurian of Gotland, Sweden-relation to similar Palaeozoic and Proterozoic events".Palaeogeography, Palaeoclimatology, Palaeoecology.195 (1–2):99–124.Bibcode:2003PPP...195...99M.doi:10.1016/S0031-0182(03)00304-3.eISSN 1872-616X.ISSN 0031-0182.LCCN 65009956.OCLC 1761774.S2CID 129353726. RetrievedDecember 12, 2025.
^"International Chronostratigraphic Chart"(PDF).International Commission on Stratigraphy. December 2024. RetrievedOctober 23, 2025.
^"Global Boundary Stratotype Section and Point". International Commission of Stratigraphy. Retrieved3 August 2024.
^Gutierrez-Marco, Juan Carlos (2021)."Silurian Treasures in Spanish UNESCO Global Geoparks"(PDF).Silurian Times.29:16–21.doi:10.13140/RG.2.2.13314.15044.
^"Silurian Telychian and Aeronian stage GSSPs have been relocated".stratigraphy.org. International Commission on Stratigraphy. Retrieved1 March 2024.
^Holland, C. (1982)."The State of Silurian Stratigraphy"(PDF).Episodes.1982:21–23. Retrieved11 December 2020.
^Gradstein, Felix M.; Ogg, James G.; Smith, Alan G. (2004).A Geologic Time Scale 2004.ISBN 9780521786737.

Geological history of Earth

Cenozoic Era
(present–66.0 Ma)

Quaternary(present–2.58 Ma)	Holocene (present–11.7 ka) Pleistocene (11.7 ka–2.58 Ma)
Neogene(2.58–23.0 Ma)	Pliocene (2.59–5.33 Ma) Miocene (5.33–23.0 Ma)
Paleogene(23.0–66.0 Ma)	Oligocene (23.0–33.9 Ma) Eocene (33.9–56.0 Ma) Paleocene (56.0–66.0 Ma)

Mesozoic Era
(66.0–252 Ma)

Cretaceous(66.0–145 Ma)	Late (66.0–100 Ma) Early (100–145 Ma)
Jurassic(145–201 Ma)	Late (145–164 Ma) Middle (164–174 Ma) Early (174–201 Ma)
Triassic(201–252 Ma)	Late (201–237 Ma) Middle (237–247 Ma) Early (247–252 Ma)

Paleozoic Era
(252–539 Ma)

Permian(252–299 Ma)	Lopingian (252–260 Ma) Guadalupian (260–272 Ma) Cisuralian (272–299 Ma)
Carboniferous(299–359 Ma)	Pennsylvanian (299–323 Ma) Mississippian (323–359 Ma)
Devonian(359–419 Ma)	Late (359–383 Ma) Middle (383–393 Ma) Early (393–419 Ma)
Silurian(419–444 Ma)	Pridoli (419–423 Ma) Ludlow (423–427 Ma) Wenlock (427–433 Ma) Llandovery (433–444 Ma)
Ordovician(444–485 Ma)	Late (444–458 Ma) Middle (458–470 Ma) Early (470–485 Ma)
Cambrian(485–539 Ma)	Furongian (485–497 Ma) Miaolingian (497–509 Ma) Series 2 (509–521 Ma) Terreneuvian (521–539 Ma)

Proterozoic Eon
(539 Ma–2.5 Ga)

Neoproterozoic(539 Ma–1 Ga)	Ediacaran (539–635 Ma) Cryogenian (635–720 Ma) Tonian (720 Ma–1 Ga)
Mesoproterozoic(1–1.6 Ga)	Stenian (1–1.2 Ga) Ectasian (1.2–1.4 Ga) Calymmian (1.4–1.6 Ga)
Paleoproterozoic(1.6–2.5 Ga)	Statherian (1.6–1.8 Ga) Orosirian (1.8–2.05 Ga) Rhyacian (2.05–2.3 Ga) Siderian (2.3–2.5 Ga)