Turonien

Turonien

Turonien is the second of six floors of the upper Cretaceous. He extends of - 93,9 My in - 89,8 My, that is a rough duration of 4,1 My charter 2012). The stratotype is defined in Tours (Indre-et-Loire).
The base of Turonien is defined by the appearance of Ammonite Watinoceras devonense. His summit is defined by the appearance of Inocérame (bivalve) Cremnoceramus rotundatus
Turonien is subdivided into 3 parts:

  • Lower Turonien,
  • Average Turonien [appearance of C. woollgari],
  • Upper Turonien

The limit Turonien inferior - average Turonien is placed at the level of the main marl Gun Gardens.
The limit Turonien means - upper Turonien is placed below the marl Southerham 1.
Turonien is widely represented in the cliffs of the Country of Callus: