Éssai de synthèse paléogéographique et stratigraphique du Bassin occidental portugais au cours du Crétacé supérieur

Abstract

Key-words: Upper Cretaceous - Portugal - Macrofauna - Microfauna - Paleogeography The Upper-Cretaceous transgressive serie is described by the authors, on the whole Occidental Portuguese Basin: it begins in the Lisbon region in the Albian and finishes in the Beira Iitoral province in the lower Turonian. while the sedimentation zones migrate Northward. The lithologie composition is given for each stage and sub-stage, taking into consideration, in particular in the Upper Cenomanian. the lateral variations from one region to another. The paleogeography becomes c1ear by the study of the sedimentation environments (6 fig.). In conclusion, the authors propose a correlation between the whole serie and the accepted zonation of the Northwestem Europe. Tables show the repartition of the main macrofauna and microfauna.