ammonites

Aalenian age/stage

General information
Lower boundary: equal to 175.6 Ma (based on Kawhia)
Upper boundary: equal to 171.6 Ma (see scale)
Continent: global
See collections within this interval
See map of collections within this interval
Key correlations
Period: Jurassic
Epoch: Middle Jurassic
10 million year bin: Jurassic 3
Contained within
  • Jurassic
  • Mesozoic
  • Sherman
  • Phanerozoic
    • Previous intervals
  • Early/Lower Jurassic
  • Toarcian
  • Late/Upper Toarcian
  • Middle Toarcian
  • Yakounensis
  • Hillebrandti
  • Crassicosta
  • Levesquei
  • Thouarsense
  • Variabilis
  • Bifrons
  • Herangi
  • Ururoan
    • Next intervals
  • Bajocian
  • Late/Upper Bajocian
  • Early/Lower Bajocian
  • Rotundum
  • Oblatum
  • Kirschneri
  • Crassicostatus
  • Widebayense
  • Parkinsoni
  • Garantiana
  • Subfurcatum
  • Humphresianum
  • Sauzei
  • Laeviuscula
  • Discites
    • Contains
  • Concavum, Early/Lower Aalenian, Howelli, Late/Upper Aalenian, Middle Aalenian, Murchisonae, Opalinum, Scissum, Westermanni
    • Shares base with
  • Kawhia, Middle Jurassic, Temaikan
    • Appears in scales
  • Gradstein 7: Stages (2004)
  • Palfy Jurassic Stages (2000)
  • Gradstein et al. 1995 Mesozoic Stages (1995)
  • Harland 6: Stages (1990)

    • Interval name: