Gastroplites cantianus Spath, 1937: an arctic ammonite in the Upper Albian from the anglo-Paris basin (Wissant section, northern France).

Gastroplites cantianus Spath, 1937, an ammonite from the arctic province of the boreal realm, is described in the Upper Albian ofWissant, Pas-de-Calais (northern France). The occurrence of this exotic ammonite in the anglo-Paris basin, which itself belongs to thenorth european province of the boreal realm, is linked to an overall rise of the sea level (transgressive interval of a third-order eustaticcycle superimposed on a second order cycle). It is probably a shell that drifted post-mortem to Europe. This discovery allows to clarifythe correlations between the northern european and arctic provinces of the boreal realm.