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Gamachian age/stage

General information
Lower boundary: after 449.5 Ma (based on Ashgill)
Upper boundary: equal to 443.7 Ma (based on Rhuddanian)
Continent: North America
See collections within this interval
See map of collections within this interval
Key correlations
Period: Ordovician
Epoch: Late/Upper Ordovician
10 million year bin: Ordovician 5
Overlaps with
  • Richmondian (449.5 to 443.7 Ma)
  • Qiantianjiang (449.5 to 443.7 Ma)
  • Wufeng (449.5 to 443.7 Ma)
  • Vormsi (452.0 to 445.6 Ma)
  • Maysville (452.0 to 445.6 Ma)
  • Rawtheyan (455.8 to 445.6 Ma)
  • middle Late Ordovician (455.8 to 445.6 Ma)
  • Katian (455.8 to 445.6 Ma)
  • Bohdalec (457.5 to 445.6 Ma)
  • Interval name: