Danian ammonites: A discussion

Possible ammonite survivors reported from the lowermost Danian deposits of Denmark (Stevns Klint) and The Netherlands (Curfs-Ankerpoort quarry) are questioned. Some of the specimens from Denmark are almost certainly reworked from the uppermost Maastrichtian deposits. As concerns the remainder of the reported material, reworking is also possible, at least theoretically. On the basis of Ockham’s Razor, the hypothesis that all specimens are reworked from the Maastrichtian strata must be preferred until compelling evidence for Danian survivors is proven. Such evidence may be potentially provided by articulated ammonite aptychi located in Danian deposits or by aptychi revealing Danian isotopic signals.