Katian

Age

  • Base: 453.0 Ma (GTS 2012), 455.8 (GTS 2004)
  • Top: 445.2 Ma (GTS 2012), 445.6 (GTS 2004)
  • Duration: 7.8 Ma (GTS 2012), 10.2 (GTS 2004)

Global stratotype section and point (GSSP)

Black Knob Ridge

Black Knob Ridge, Oklahoma, USA, is the type section for the Katian Stage. The boundary level is at the foot of the person in the background. Photo by Jaak Nõlvak.