ammonites

Orosirian period

General information
Lower boundary: after 2500 Ma (based on Paleoproterozoic)
Upper boundary: before 1600 Ma (based on Paleoproterozoic)
Continent: global
See collections within this interval
See map of collections within this interval
Key correlations
Period: Statherian
Contained within
  • Paleoproterozoic
    • Previous intervals
  • Archean
  • Neoarchean
    • Next intervals
  • Mesoproterozoic
  • Stenian
  • Ectasian
  • Calymmian
    • Contains
  • Animikean, Huronian, Isuan, Randian, Swazian
    • Shares base with
  • Proterozoic
    • Overlaps with
  • Riphean (1650.0 to 635.0 Ma)
  • Burzyan (1650.0 to 1350.0 Ma)
  • Statherian (2500.0 to 1600.0 Ma)
  • Rhyacian (2500.0 to 1600.0 Ma)
  • Siderian (2500.0 to 1600.0 Ma)
  • Early/Lower Imbrian (3850.0 to 1650.0 Ma)
  • Hadean (4560.0 to 1650.0 Ma)
    • Appears in scale
  • Gradstein 3: Periods (2004)

    • Interval name: