ammonites

Ontarian age/stage

General information
Lower boundary: after 439 Ma (based on Aeronian)
Upper boundary: before 428.2 Ma (based on Telychian)
Continent: North America
See collections within this interval
See map of collections within this interval
Key correlations
Period: Silurian
Epoch: Llandovery
10 million year bin: Silurian 1
Contained within
  • Litenschichten
  • Niagaran
  • Silurian
  • Sherman
  • Paleozoic
  • Phanerozoic
    • Previous intervals
  • Rhuddanian
  • Cowleigh Park
  • Juuru
    • Next intervals
  • Wenlock
  • Sheinwoodian
  • Coalbrookdale
  • Buildwas
  • Mulde
  • Slite
  • Hogklint
  • Upper Visby
  • Lockportian
  • Jaagarahu
  • Jaani
  • Lockport
    • Shares base with
  • Aeronian, Clinton
    • Shares top with
  • Llandovery, Lower Visby, Polaty, Telychian, Woolhope
    • Overlaps with
  • Tonawandan (436.0 to 426.2 Ma)
  • Chesnokovka (436.0 to 426.2 Ma)
  • Wych (439.0 to 428.2 Ma)
  • Adavere (439.0 to 428.2 Ma)
  • Syrovaty (439.0 to 428.2 Ma)
  • Alexandrian (443.7 to 436.0 Ma)
  • Raikkula (443.7 to 436.0 Ma)
  • Medina (443.7 to 436.0 Ma)
  • Vtorye Utesy (443.7 to 436.0 Ma)
    • Appears in scale
  • Harland Silurian of North America (1990)

    • Interval name: