ammonites

Isuan period

General information
Lower boundary: equal to 1650 Ma (based on Burzyan)
Upper boundary: before 1650 Ma (based on Early/Lower Imbrian)
Continent: global
See collections within this interval
See map of collections within this interval
Key correlations
Period: Statherian
Contained within
  • Paleoproterozoic
  • Statherian
  • Orosirian
  • Rhyacian
  • Siderian
  • Proterozoic
    • Shares base with
  • Burzyan, Riphean
    • Shares top with
  • Early/Lower Imbrian, Hadean
    • Overlaps with
  • Animikean (1650.0 to 1650.0 Ma)
  • Huronian (1650.0 to 1650.0 Ma)
  • Randian (1650.0 to 1650.0 Ma)
  • Swazian (1650.0 to 1650.0 Ma)
    • Appears in scale
  • Harland 1: Eras (1990)

    • Interval name: