The limestones in Tercis Quarry, Dax (Landes), south-west France expose high Upper Campanian and low Lower Maastrichtian in which ammonites occur and inoceramids and Echinocorys are common. The vertical ranges of these groups, combined with some evidence from other echinoids and the nannoplankton, provide correlations with the Biscay region, eastern England, north Germany and Poland. The appearance at Tercis of the much quoted Maastrichtian indices Hoploscaphites constrictus and Pachydiscus neubergicus is around the middle of the Lower Maastrichtian on the belemnite scale of northern Europe. The base of the Maastrichtian on the belemnite scale has not been fixed with precision in Tercis Quarry, but it must still be higher than the disappearance-level of Globotruncanita calcarata (Cushman). -Authors
