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Roadian

Subdivision of the Permian according to the ICS, as of 2023.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 ConodontJinogondolella nanginkensisLower boundary GSSP, Guadalupe Mountains, Texas, USA31°52′36″N104°52′36″W / 31.8767°N 104.8768°W / 31.8767; -104.8768Lower GSSP ratified2001Upper boundary definitionFAD of the Conodont Jinogondolella aserrataUpper boundary GSSPGuadalupe Pass, Guadalupe Mountains, Texas, USA31°51′57″N104°49′58″W / 31.8658°N 104.8328°W / 31.8658; -104.8328Upper GSSP ratified2001In the geologic timescale, the Roadian is an age or stage of the Permian.

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