Santonien

Santonien

Santonien is the fourth of six floors of the upper Cretaceous. It extends of - 85,8 ± 0,7 My in - 83.5 ± 0.7 My, is a rough duration of 2,3 My. The stratotype is defined in Saints (Charente-Maritime).
The base of Santonien is defined by the appearance of Inocérame (bivalve) Cladoceramus undulatoplicatus. His summit is defined by the extinction of Crinoïde Marsupites testudinarius.
Santonien can be subdivided into 3 sub-floors:

  • Santonien inferior,
  • Santonien means (base: extinction of Cladoceramus undulatoplicatus),
  • Santonien superior (base: F.O. of Uintacrinus socialis).

The limits lithostratigraphiques corresponding to these 3 subdivisions are:

The most beautiful cups of Santonien observe between cliffs in him W of Saint-Valéry (lower and more average Santonien) and those of the staircase of Sotteville Santonien)(upper .