Maastrichtian Ammonites from the Biscay Region (France, Spain)

Maastrichtian sediments exposed in the Bay of Biscay region at coastal sections at Zumaya and Sopelana, northern Spain, and Hendaye and Bidart, France, yield the most diverse Upper Maastrichtian ammonite faunas yet recovered. Thirty-two species/subspecies referred to 21 genera are described, one of which, Anapachydiscus terminus , is new. The ranges of all taxa are fully documented and provide the basis for a four-fold division of the uppermost...