ammonites

Tremadocian age/stage

General information
Lower boundary: equal to 488.3 Ma (see scale)
Upper boundary: equal to 478.6 Ma (see scale)
Continent: global
See collections within this interval
See map of collections within this interval
Key correlations
Period: Ordovician
Epoch: Early/Lower Ordovician
10 million year bin: Ordovician 1
Contained within
  • Paleozoic
  • Phanerozoic
    • Previous intervals
  • Cambrian
  • Merioneth
  • Dolgellian
  • Maentwrogian
  • Dolgelly
  • Ffestiniog
  • Maentwrog
  • Trempealeauan
  • Franconian
  • Dresbachian
  • Furongian
  • Ketyan
  • Yurakian
  • Tavgian
  • Payntonian
  • Taoyuanian
  • Millardan
  • Sunwaptan
  • Steptoean
  • Batyrbaian
  • Aksayan
  • Sakian
  • Merionethian
  • Niuchehean
    • Next intervals
  • Arenig
  • Klabava
  • Cassinian
  • Blackhillsian
  • Whitlandian
  • Moridunian
  • Arenigian
  • Yangtzi
  • Dawan
  • Daobaowan
  • Ningkuo
  • Yushanian
  • Valhallan
  • Billingen
  • Latorpian
  • late Early Ordovician
  • Floian
    • Equivalent to
  • Tremadoc, Yichang, Lianghekou, Ichangian
    • Contains
  • Cressagian, Deming, Demingian, Gasconadian, Migneintian, Skullrockian, Stairsian, Ungurian, Warendian
    • Shares base with
  • Canadian, Datsonian, Early/Lower Ordovician, Hunjiang, Ibexian, Jefferson, Jeffersonian, Lancefieldian, Mansian, Oeland, Ordovician, Pakerort, Tulean, Varangu
    • Overlaps with
  • Latorp (484.5 to 471.8 Ma)
  • Hunneberg (484.5 to 471.8 Ma)
  • Olentian (501.0 to 484.5 Ma)
    • Appears in scales
  • Wang et al. Ordovician Stages (2009)
  • Bergström et al. Ordovician Stages (2006)
  • Bergström et al. Ordovician Stages of Webby et al. (2006)
  • Webby et al. Ordovician Stages (2004)
  • Gradstein 7: Stages (2004)
  • Ordovician Stages (1998)
  • Webby 1998 Bohemian Stages (1998)

    • Interval name: