ammonites

Twinbuttean subage/stage

General information
Lower boundary: after 50.3 Ma (based on Bridgerian)
Upper boundary: equal to 46.2 Ma (based on Bridgerian)
Continent: North America
See collections within this interval
See map of collections within this interval
Key correlations
Period: Paleogene
Epoch: Eocene
10 million year bin: Cenozoic 2
Contained within
  • Bridgerian
  • Eocene
  • Dannevirke
  • Paleogene
  • Tertiary
  • Cenozoic
  • Phanerozoic
    • Previous intervals
  • Wasatchian
  • Lostcabinian
  • Lysitean
  • Graybullian
  • Sandcouleean
    • Next intervals
  • Uintan
  • Late/Upper Uintan
  • Early/Lower Uintan
  • Porangan
    • Shares top with
  • Heretaungan
    • Overlaps with
  • Mustersan (48.0 to 42.0 Ma)
  • Middle Eocene (48.6 to 37.2 Ma)
  • Sharamurunian (48.6 to 37.2 Ma)
  • Irdinmanhan (48.6 to 37.2 Ma)
  • Arshantan (48.6 to 37.2 Ma)
  • Lutetian (48.6 to 40.4 Ma)
  • MP 15 (48.6 to 40.4 Ma)
  • MP 14 (48.6 to 40.4 Ma)
  • MP 13 (48.6 to 40.4 Ma)
  • MP 12 (48.6 to 40.4 Ma)
  • MP 11 (48.6 to 40.4 Ma)
  • Blacksforkian (50.3 to 46.2 Ma)
  • Gardnerbuttian (50.3 to 46.2 Ma)
  • Mangaorapan (53.0 to 49.5 Ma)
  • Casamayoran (55.8 to 48.0 Ma)
  • Early/Lower Eocene (55.8 to 48.6 Ma)
  • Ypresian (55.8 to 48.6 Ma)
  • Bumbanian (55.8 to 48.6 Ma)
  • MP 10 (55.8 to 48.6 Ma)
  • MP 8 + 9 (55.8 to 48.6 Ma)
  • MP 7 (55.8 to 48.6 Ma)
    • Appears in scale
  • North American Mammal Subages/Zones: Puercan - Uintan (1987)

    • Interval name: