Correlation of calcareous nannofossil zones to the local first occurrence ofPachydiscus neubergicus(von Hauer, 1858) (Ammonoidea) in European Upper Cretaceous sections

Abstract

AbstractThe first occurrence (FO) of the ammonitePachydiscus neubergicus(von Hauer, 1858) has been correlated to calcareous nannofossil zonations in several European sections along the northern margin of the Tethyan palaeobiogeographic realm. Both the proposed stratotype section of Tercis (SW France) and complete, ammonite-bearing sections in northern Spain document the FO ofP. neubergicuswithin standard nannofossil zone CC23a (UC16), below the LO ofBroinsonia parca constricta. Other sections such as the type locality Neuberg (Austria), Nagoriani (the Ukraine) and Bjala (Bulgaria) indicate considerable diachroneity of local FOs and showP. neubergicusto range up to nannofossil zone CC25b/c (UC20; Late Maastrichtian).