THE CRETACEOUS-TERTIARY BOUNDARY IN MARIN E ENVIRONMENTS FROM CENTRALPYRENEES (SUB-PYRENEAN ZONE, FRANCE)

The discovery of Paleocene planktonic Foraminifera (subzones P1c to P3 b) in the western sub-Pyrenean zone (Haute-Garonne) made it possible t o locate an anomalously high abundance of iridium at the Cretaceous-Te rtiary boundary underlining the interface between the 'calcaires a Bry ozoaires/calcaires a Algues, of Larcan-Nizan', newly assigned to Dania n-Selandian and the underlying 'marnes bleues de Saint-Loup', the top of them being Uppermost Maastrichtian in age (Hariaensis zone and grad e-datation of 65.47 Ma). A short gap (subzones P0 to P1b, Lowermost Da nian)probably marks, as in Bearn, the base of the Paleocene Larcan-Niz an Bryalgal limestones. (C) Academie des sciences/Elsevier, Paris.