ammonites

Early/Lower Ordovician epoch

General information
Lower boundary: equal to 488.3 Ma (based on Tremadocian)
Upper boundary: equal to 471.8 Ma (based on Floian)
Continent: global
See collections within this interval
See map of collections within this interval
Key correlations
Period: Ordovician
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
  • Middle Ordovician
  • Volkhov
  • Whiterockian
  • Rangerian
  • Fennian
  • Valaste
  • Hunderum
  • Langevoja
  • Vaana
  • Saka
  • Volkhovian
  • early Middle Ordovician
  • Dapingian
    • Contains
  • Bendigonian, Chewtonian, Ibexian, Tulean
    • Shares base with
  • Canadian, Cressagian, Datsonian, Deming, Demingian, Gasconadian, Hunjiang, Ichangian, Jefferson, Jeffersonian, Lancefieldian, Lianghekou, Mansian, Migneintian, Oeland, Ordovician, Pakerort, Skullrockian, Stairsian, Tremadoc, Tremadocian, Ungurian, Varangu, Warendian, Yichang
    • Shares top with
  • Billingen, Blackhillsian, Floian, Hunneberg, Latorp, Latorpian, Moridunian, Whitlandian, late Early Ordovician
    • Overlaps with
  • Castlemainian (472.0 to 468.9 Ma)
  • Yangtzi (478.6 to 460.9 Ma)
  • Arenig (478.6 to 466.0 Ma)
  • Klabava (478.6 to 466.0 Ma)
  • Cassinian (478.6 to 468.1 Ma)
  • Arenigian (478.6 to 468.1 Ma)
  • Dawan (478.6 to 468.1 Ma)
  • Daobaowan (478.6 to 468.1 Ma)
  • Ningkuo (478.6 to 468.1 Ma)
  • Yushanian (478.6 to 468.1 Ma)
  • Valhallan (478.6 to 468.1 Ma)
  • Olentian (501.0 to 484.5 Ma)
    • Appears in scales
  • Gradstein 5: Epochs (2004)
  • Erwin and Bowring Cambrian Epochs (2004)
  • Ordovician Series (1998)
  • Harland 3: Subperiods (Ordovician) (1990)

    • Interval name: