ammonites

Plesechioceras harbledownense zone

General information
Lower boundary: after 196.5 Ma (based on Sinemurian)
Upper boundary: equal to 190.7 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: Sinemurian
10 million year bin: Jurassic 1
Contained within
  • Aratauran
  • Early/Lower Jurassic
  • Herangi
  • Jurassic
  • Mesozoic
  • Sherman
  • Phanerozoic
    • Previous intervals
  • Hettangian
  • Pseudaetomoceras
  • Psiloceras
  • Angulata
  • Liasicus
  • Planorbis
  • Late/Upper Hettangian
  • Middle Hettangian
  • Early/Lower Hettangian
    • Next interval
  • Tetraspidoceras
    • Shares base with
  • Arnioceras arnouldi, Bucklandi, Early/Lower Sinemurian, Late/Upper Sinemurian, Obtusum, Oxynotum, Raricostatum, Semicostatum, Sinemurian, Turneri
    • Shares top with
  • Canadensis
    • Overlaps with
  • Asteroceras varians (196.5 to 190.7 Ma)
  • Coroniceras (196.5 to 190.7 Ma)
    • Appears in scale
  • Palfy North American Ammonite Chrons (2000)

    • Interval name: