ammonites

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
Contained within
  • Ashgill
  • Bolindian
  • Chientangkiangian
  • Ashgillian
  • Sherman
  • Paleozoic
  • Phanerozoic
    • Previous intervals
  • Caradoc
  • Llandeilo
  • Onnian
  • Late/Upper Llandeilo
  • Middle Llandeilo
  • Nabala
  • Johvi
  • Kukruse
  • Edenian
  • Trentonian
  • Wildernessian
  • Ashbyan
  • Maysvillian
  • Chatfieldian
  • Turinian
  • Streffordian
  • Berounian
  • Eastonian
  • Hanjiang
  • Neichiashanian
  • Haljala
  • Caradocian
  • Franklinian
  • Kirkfieldian
  • Rocklandian
  • Shermanian
  • Blackriveran
    • Next intervals
  • Silurian
  • Llandovery
  • Rhuddanian
  • Cowleigh Park
  • Litenschichten
  • Alexandrian
  • Raikkula
  • Juuru
  • Niagaran
  • Medina
  • Vtorye Utesy
    • Shares base with
  • Cautleyan, Kralodvorian, Kraluv Dvur, Pirgu, Pusgillian, Richmond
    • Shares top with
  • Aijiashan, Cincinnatian, Gamach, Harju, Hirnantian, Kosov, Kosovian, Late/Upper Ordovician, Ordovician, Porkuni, Shikou, Xiaoxita, late Late Ordovician
    • 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)
    • Appears in scales
  • Gradstein Late Ordovician Stages of North America (2004)
  • Webby 1998 North American Stages (Caradocian - Ashgillian) (1998)
  • Ross et al. 1982 Ordovician Stages of North America I (1998)

    • Interval name: