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Telychian

Subdivision of the Silurian according to the ICS, as of 2024.Vertical axis scale: Millions of years agoEtymologyName formalityFormalUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitAgeStratigraphic unitStageTime span formalityFormalLower boundary definitionFAD of the graptoliteSpirograptus guerichiLower boundary GSSPEl Pintado section, Seville, Spain37°59′07″N5°55′43″W / 37.9853°N 5.9285°W / 37.9853; -5.9285Lower GSSP ratified2024Upper boundary definitionImprecise.

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