ammonites

Harrisonian age/stage

General information
Lower boundary: equal to 24.8 Ma (see scale)
Upper boundary: equal to 20.43 Ma (based on Aquitanian)
Continent: North America
See collections within this interval
See map of collections within this interval
Contained within
  • Tertiary
  • Cenozoic
  • Phanerozoic
    • Previous interval
  • Monroecreekian
    • Next intervals
  • Burdigalian
  • Hemingfordian
  • Late/Upper Hemingfordian
  • Early/Lower Hemingfordian
    • Contains
  • MN 1
    • Shares top with
  • Aquitanian, Arikareean, early Early Arikareean, early Late Arikareean, late Early Arikareean, late Late Arikareean
    • Overlaps with
  • Colhuehuapian (21.0 to 17.5 Ma)
  • Pareora (21.7 to 15.9 Ma)
  • Otaian (21.7 to 19.0 Ma)
  • MN 2 (22.4 to 20.0 Ma)
  • Neogene (23.03 to 2.588 Ma)
  • Miocene (23.03 to 5.332 Ma)
  • Early/Lower Miocene (23.03 to 15.97 Ma)
  • Xiejiaan (23.03 to 16.9 Ma)
  • Agenian (23.03 to 20.0 Ma)
  • Waitakian (25.2 to 21.7 Ma)
  • Late/Upper Oligocene (28.4 to 23.03 Ma)
  • Chattian (28.4 to 23.03 Ma)
  • Tabenbulakian (28.4 to 23.03 Ma)
  • MP 30 (28.4 to 23.03 Ma)
  • MP 29 (28.4 to 23.03 Ma)
  • MP 28 (28.4 to 23.03 Ma)
  • MP 27 (28.4 to 23.03 Ma)
  • MP 26 (28.4 to 23.03 Ma)
  • Deseadan (29.0 to 21.0 Ma)
  • Oligocene (33.9 to 23.03 Ma)
  • Hsandagolian (33.9 to 23.03 Ma)
  • MP 25 (33.9 to 23.03 Ma)
  • Landon (34.3 to 21.7 Ma)
  • Paleogene (65.5 to 23.03 Ma)
    • Appears in scale
  • North American Land Mammal Ages (2000)

    • Interval name: