ammonites

Early/Lower Jurassic epoch

General information
Lower boundary: equal to 201.6 Ma (based on Hettangian)
Upper boundary: equal to 175.6 Ma (based on Herangi)
Continent: global
See collections within this interval
See map of collections within this interval
Key correlations
Period: Jurassic
Contained within
  • Mesozoic
  • Sherman
  • Phanerozoic
    • Previous intervals
  • Triassic
  • Late/Upper Triassic
  • Rhaetian
  • Balfour
  • Otapirian
  • Misikella ultima
  • Misikella rhaetica
  • Misikella posthernsteini-hernsteini
  • Misikella bidentata-posthernsteini
    • Next intervals
  • Middle Jurassic
  • Aalenian
  • Howelli
  • Scissum
  • Westermanni
  • Concavum
  • Murchisonae
  • Opalinum
  • Late/Upper Aalenian
  • Middle Aalenian
  • Early/Lower Aalenian
  • Kawhia
  • Temaikan
    • Equivalent to
  • Herangi
    • Contains
  • Arnioceras arnouldi, Asteroceras varians, Bucklandi, Canadensis, Carlottense, Coroniceras, Davoei, Early/Lower Pliensbachian, Early/Lower Sinemurian, Early/Lower Toarcian, Falciferum, Freboldi, Ibex, Imlayi, Jamesoni, Kanense, Kunae, Late/Upper Pliensbachian, Late/Upper Sinemurian, Margaritatus, Obtusum, Oxynotum, Planulata, Plesechioceras harbledownense, Pliensbachian, Pseudaetomoceras, Raricostatum, Semicostatum, Sinemurian, Spinatum, Tenuicostatum, Tetraspidoceras, Turneri, Whiteavesi
    • Shares base with
  • Angulata, Aratauran, Early/Lower Hettangian, Euphyllites, Franziceras, Hettangian, Jurassic, Late/Upper Hettangian, Liasicus, Middle Hettangian, Planorbis, Psiloceras
    • Shares top with
  • Bifrons, Crassicosta, Hillebrandti, Late/Upper Toarcian, Levesquei, Middle Toarcian, Thouarsense, Toarcian, Ururoan, Variabilis, Yakounensis
    • Appears in scales
  • Gradstein 5: Epochs (2004)
  • Harland 4: Epochs (1990)

    • Interval name: