Sandbian

GSSP for the Sandbian Stage, and Upper Ordovician, at Fågelsång, southern Sweden. Prof. S. Finney fixing the golden spike at the boundary level, coinciding with the FAD of Nemagraptus gracilis. Photo courtesy to Stan Finney.

Age

  • Base: 458.4 Ma (GTS 2012), 460.9 (GTS 2004)
  • Top: 453.0 Ma (GTS 2012), 455.8 (GTS 2004)
  • Duration: 5.4 Ma (GTS 2012), 5.1 (GTS 2004)

Global stratotype section and point (GSSP)