ammonites

Riochican age/stage

General information
Lower boundary: equal to 57 Ma (see scale)
Upper boundary: equal to 55.8 Ma (based on Thanetian)
Continent: South America
See collections within this interval
See map of collections within this interval
Key correlations
Period: Paleogene
Epoch: Paleocene
Subepoch: Late/Upper Paleocene
Stage: Thanetian
10 million year bin: Cenozoic 1
Contained within
  • Dannevirke
  • Paleogene
  • Tertiary
  • Cenozoic
  • Phanerozoic
    • Previous interval
  • Itaboraian
    • Next intervals
  • Eocene
  • Early/Lower Eocene
  • Ypresian
  • Wasatchian
  • Lostcabinian
  • Lysitean
  • Graybullian
  • Sandcouleean
  • Casamayoran
  • Waipawan
  • Bumbanian
  • MP 10
  • MP 8 + 9
  • MP 7
    • Shares top with
  • Cf1, Cf2, Cf3, Clarkforkian, Gashatan, Late/Upper Paleocene, MP 1 - 5, MP 6, Paleocene, Teurian, Thanetian
    • Overlaps with
  • Tiffanian (61.7 to 56.8 Ma)
  • Ti6 (61.7 to 56.8 Ma)
  • Ti5 (61.7 to 56.8 Ma)
  • Ti4 (61.7 to 56.8 Ma)
  • Ti3 (61.7 to 56.8 Ma)
  • Ti2 (61.7 to 56.8 Ma)
  • Ti1 (61.7 to 56.8 Ma)
    • Appears in scale
  • South American Land Mammal Ages (1995)

    • Interval name: