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Aeronian

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 graptoliteDemirastrites triangulatusLower boundary GSSPHlásná Třebaň section, Czech Republic49°55′23″N14°12′43″E / 49.9230°N 14.2119°E / 49.9230; 14.2119Lower GSSP ratified2024Upper boundary definitionFAD of the graptolite Spirograptus guerichiUpper boundary GSSPEl Pintado section, Seville, Spain37°59′07″N5°55′43″W / 37.9853°N 5.9285°W / 37.9853; -5.9285Upper GSSP ratified2024In the geologic timescale, the Aeronian is an age of the Llandovery Epoch of the SilurianPeriod of the PaleozoicEra of the PhanerozoicEon that began 440.5 ± 1.0 Ma and ended 438.6 ± 1.0 Ma (million years ago).

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