In thegeologic timescale,theTelychianis the third and finalageof theLlandovery Epochof theSilurianPeriodof thePaleozoicEraof thePhanerozoicEon.The Telychian Age was between 438.5 ± 1.2 million years ago (Ma) and 433.4 ± 0.8 Ma. The Telychian Age succeeds theAeronianAge and precedes theSheinwoodianAge.[8]The name of the interval is derived from the Pen-lan-Telych Farm nearLlandovery,Powys,Wales.
| Telychian | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 Paleogeography of the Telychian, 435 Ma | |||||||||||||
| Chronology | |||||||||||||
| |||||||||||||
| Etymology | |||||||||||||
| Name formality | Formal | ||||||||||||
| Usage information | |||||||||||||
| Celestial body | Earth | ||||||||||||
| Regional usage | Global (ICS) | ||||||||||||
| Time scale(s) used | ICS Time Scale | ||||||||||||
| Definition | |||||||||||||
| Chronological unit | Age | ||||||||||||
| Stratigraphic unit | Stage | ||||||||||||
| Time span formality | Formal | ||||||||||||
| Lower boundary definition | FADof thegraptoliteSpirograptus guerichi | ||||||||||||
| Lower boundary GSSP | El Pintado section,
Seville,Spain 37°59′07″N5°55′43″W/ 37.9853°N 5.9285°W[4] | ||||||||||||
| Lower GSSP ratified | 2024[5][6] | ||||||||||||
| Upper boundary definition | Imprecise. Currently placed betweenacritarchbiozone 5 andLADofPterospathodus amorphognathoides.See Llandoveryfor more info. | ||||||||||||
| Upper boundary definition candidates | A conodont boundary (Ireviken datum 2) which is close to themurchisonigraptolite biozone. | ||||||||||||
| Upper boundary GSSP candidate section(s) | None | ||||||||||||
| Upper boundary GSSP | Hughley Brook,Apedale,UK 52°34′52″N2°38′20″W/ 52.5811°N 2.6389°W | ||||||||||||
| Upper GSSP ratified | 1980[7] | ||||||||||||
It ended with theIreviken event.
Ireviken event
editTheIreviken eventwas the first of three relatively minorextinction events(the Ireviken,Mulde,andLauevents) during the Silurian Period. It occurred at theLlandovery/Wenlockboundary (mid Silurian,433.4± 0.8 million years ago). The event is best recorded atIreviken,Gotland,where over 50% oftrilobitespecies became extinct; 80% of the globalconodontspecies also become extinct in this interval.
References
edit- ^Jeppsson, L.; Calner, M. (2007). "The Silurian Mulde Event and a scenario for secundo—secundo events".Earth and Environmental Science Transactions of the Royal Society of Edinburgh.93(02): 135–154.doi:10.1017/S0263593300000377.
- ^Munnecke, A.; Samtleben, C.; Bickert, T. (2003). "The Ireviken Event in the lower Silurian of Gotland, Sweden-relation to similar Palaeozoic and Proterozoic events".Palaeogeography, Palaeoclimatology, Palaeoecology.195(1): 99–124.doi:10.1016/S0031-0182(03)00304-3.
- ^"International Chronostratigraphic Chart"(PDF).International Commission on Stratigraphy.September 2023.RetrievedNovember 10,2024.
- ^"Global Boundary Stratotype Section and Point".International Commission of Stratigraphy.Retrieved3 August2024.
- ^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 March2024.
- ^Holland, C. (1982)."The State of Silurian Stratigraphy"(PDF).Episodes.1982:21–23.Retrieved11 December2020.
- ^Gradstein, Felix M.; Ogg, James G.; Smith, Alan G. (2004).A Geologic Time Scale 2004.ISBN9780521786737.
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