ammonites

Planulata zone

General information
Lower boundary: equal to 182 Ma (see scale)
Upper boundary: equal to 180.1 Ma (see scale)
Continent: North America
See collections within this interval
See map of collections within this interval
Key correlations
Period: Jurassic
Epoch: Early/Lower Jurassic
Stage: Toarcian
10 million year bin: Jurassic 3
Contained within
  • Toarcian
  • Ururoan
  • Early/Lower Jurassic
  • Herangi
  • Jurassic
  • Mesozoic
  • Sherman
  • Phanerozoic
    • Previous intervals
  • Early/Lower Toarcian
  • Kanense
  • Falciferum
  • Tenuicostatum
    • Next intervals
  • Late/Upper Toarcian
  • Yakounensis
  • Hillebrandti
  • Crassicosta
  • Thouarsense
    • Shares base with
  • Bifrons, Levesquei, Middle Toarcian, Variabilis
    • Appears in scale
  • Palfy North American Ammonite Chrons (2000)

    • Interval name: