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)

  • Locality: Black Knob Ridge Section, Atoka, Oklahoma (USA) (34.4305°N, 96.0746°W)
  • Boundary level: 4.0m above the base of the Bigfork Chert
  • Correlation events: Graptolite FAD Diplacanthograptus caudatus
  • Status: Ratified 2006, Episodes 30/4, p. 258-270, 2007

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.