View source for Telychian

{{short description|Third stage of the Silurian and last stage of the Llandovery}}
{{Infobox geologic timespan
| name                         = Telychian
| color                        = Telychian
| time_start                   = 438.5
| time_start_uncertainty       = 1.1
| time_end                     = 433.4
| time_end_uncertainty         = 0.8
| image_map                    = Silurian plate tectonics.png
| caption_map                  = Paleogeography of the Telychian, 435 Ma
| image_outcrop                =
| caption_outcrop              =
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<!--Chronology-->  
| timeline                     = Silurian
| former_subdivisions          =
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<!--Etymology-->
| name_formality               = Formal
| name_accept_date             =
| alternate_spellings          =
| synonym1                     =
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<!--Usage Information--> 
| celestial_body               = earth
| usage                        = Global ([[International Commission on Stratigraphy|ICS]])
| timescales_used              = ICS Time Scale
| formerly_used_by             =
| not_used_by                  =
<!--Definition-->
| chrono_unit                  = Age
| strat_unit                   = Stage
| proposed_by                  =
| timespan_formality           = Formal
| lower_boundary_def           = [[First appearance datum|FAD]] of the [[graptolite]] ''Spirograptus guerichi'' 
| lower_gssp_location          = El Pintado section, 
[[Province of Seville|Seville]], [[Spain]]
| lower_gssp_coords            = {{Coord|37.9853|N|5.9285|W|display=inline}}<ref name="GSSP Web">{{cite web |title=Global Boundary Stratotype Section and Point |url=https://stratigraphy.org/gssps/ |publisher=International Commission of Stratigraphy |access-date=3 August 2024}}</ref>
| lower_gssp_accept_date       = 2024<ref>{{cite journal |last1=Gutierrez-Marco |first1=Juan Carlos |title=Silurian Treasures in Spanish UNESCO Global Geoparks |journal=Silurian Times |volume=29 |pages=16–21 |date=2021 |doi=10.13140/RG.2.2.13314.15044 |url=https://silurian.stratigraphy.org/files/SilurianTimes29.pdf}}</ref><ref name = "telaer">{{cite web |title=Silurian Telychian and Aeronian stage GSSPs have been relocated |url=https://stratigraphy.org/news/151 |website=stratigraphy.org |publisher=International Commission on Stratigraphy |access-date=1 March 2024}}</ref>
| upper_boundary_def           = Imprecise. Currently placed between [[acritarch]] biozone 5 and [[Last appearance datum|LAD]] of ''[[Pterospathodus|Pterospathodus amorphognathoides]]''. [[Llandovery Epoch#GSSP|See Llandovery]] for more info.
| upper_gssp_candidates        = None
| upper_def_candidates         = A conodont boundary (Ireviken datum 2) which is close to the ''murchisoni'' graptolite biozone.
| upper_gssp_location          = [[Hughley Brook]], [[Apedale]], [[United Kingdom|UK]]
| upper_gssp_coords            = {{Coord|52.5811|N|2.6389|W|display=inline}}
| upper_gssp_accept_date       = 1980<ref name="silurianState">{{cite journal |last1=Holland |first1=C. |title=The State of Silurian Stratigraphy |journal=Episodes |date=1982 |volume=1982 |pages=21-23 |url=https://stratigraphy.org/gssps/files/sheinwoodian-ludfordian.pdf |access-date=11 December 2020}}</ref>
<!--Atmospheric and Climatic Data-->
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}}
In the [[geologic timescale]], the '''Telychian''' is the third and final [[geologic age|age]] of the [[Llandovery Epoch]] of the [[Silurian]] [[geologic period|Period]] of the [[Paleozoic]] [[geologic era|Era]] of the [[Phanerozoic]] [[geologic eon|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.<ref name="a2004">{{cite book |isbn=9780521786737|title=A Geologic Time Scale 2004|last1=Gradstein|first1=Felix M.|last2=Ogg|first2=James G.|last3=Smith|first3=Alan G.|year=2004}}</ref> The name of the interval is derived from the Pen-lan-Telych Farm near [[Llandovery]], Powys, [[Wales]].

It ended with the [[Ireviken event]].

== Ireviken event ==
{{main|Ireviken event}}
The [[Ireviken event]] was the first of three relatively minor [[extinction event]]s (the Ireviken, [[Mulde event|Mulde]], and [[Lau event|Lau]] events) during the Silurian Period. It occurred at the [[Llandovery epoch|Llandovery]]/[[Wenlock epoch|Wenlock]] boundary (mid Silurian, {{Ma|Wenlock|{{period start error|Wenlock}}&nbsp;million years ago}}). 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.

== References ==
{{reflist}}

{{Geological history|p|p}}

[[Category:Telychian| ]]
[[Category:Llandovery epoch]]
[[Category:Silurian geochronology]]


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