Hirnantian

Age

  • Base: 445.2 Ma (GTS 2012), 445.6 (GTS 2004)
  • Top: 443.8 Ma (GTS 2012), 443.7 (GTS 2004)
  • Duration: 1.4 Ma (GTS 2012), 1.9 (GTS 2004)

Global stratotype section and point (GSSP)

  • Locality: Wangjiawan North section, N of Yichang city, Western Hubei Province, China (30.9841°N, 111.4197°E)
  • Boundary level: 0.39m below the base of the Kuanyinchiao Bed
  • Correlation events: Graptolite FAD Normalograptus extraordinarius
  • Status: Ratified 2006, Episodes 29/3, p. 183-196, 2006

GSSP for the Hirnantian Stage in Wangjawan North section, Hubei, China. Photo by Olle Hints.