Roadian

EtymologyName 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, USA
31°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, USA
31°51′57″N104°49′58″W / 31.8658°N 104.8328°W / 31.8658; -104.8328Upper GSSP ratified2001

In the geologic timescale, the Roadian is an age or stage of the Permian. It is the earliest or lower of three subdivisions of the GuadalupianEpoch or Series. The Roadian lasted between 274.4 and 266.9 million years ago (Ma). It was preceded by the Kungurian and followed by the Wordian.