ammonites

Scissum zone

General information
Lower boundary: after 175.6 Ma (based on Kawhia)
Upper boundary: before 171.6 Ma (based on Aalenian)
Continent: North America
See collections within this interval
See map of collections within this interval
Key correlations
Period: Jurassic
Epoch: Middle Jurassic
Stage: Aalenian
10 million year bin: Jurassic 3
Contained within
  • Aalenian
  • 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
    • Shares base with
  • Kawhia, Middle Jurassic, Temaikan
    • Overlaps with
  • Howelli (175.6 to 171.6 Ma)
  • Westermanni (175.6 to 171.6 Ma)
  • Concavum (175.6 to 171.6 Ma)
  • Murchisonae (175.6 to 171.6 Ma)
  • Opalinum (175.6 to 171.6 Ma)
  • Late/Upper Aalenian (175.6 to 171.6 Ma)
  • Middle Aalenian (175.6 to 171.6 Ma)
  • Early/Lower Aalenian (175.6 to 171.6 Ma)
    • Appears in scale
  • Palfy North American Ammonite Chrons (2000)

    • Interval name: