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:
- Between Saint-Jouin-Bruneval and The Door of Upstream to Etretat;
- Occasionally between The Door of Upstream and Vaucottes;
- Of the Course Fagnet (Fécamp is), by going towards Senneville and Saint-Pierre-en-Port;
- Between the terminal ferry of Dieppe and Penly;
- Between Penly and Tréport;
- To Mers-les-Bains and to the Wood of Cise.