Rocha, Rogério BHenriques, María Helena PaivaSoares, AntonioMouterde, RenéCaloo, BrigitteRuget, ChristianeFernández López, Sixto Rafael2023-06-202023-06-201990https://hdl.handle.net/20.500.14352/58455The Cabo Mondego section situated on the Atlantic coast, 160 km north of Lisbon, presents characteristics of a good boundary stratotype section (G.S.S.P.). The outcrop is easily accessible and well exposed near the sea where the erosion process is continuous. The section shows a thick succession of clay limestones with a regular sedimentation and belongs to a sedimenrary basin whose palaeogeography is already well established. The variety and abundance of cephalopods provide good correlation between the submediterranean and the subboreal provinces. This section has already been considered during the discussion on the definition of the boundary stage (Orsay meeting, 1970).engjournal articleopen access564.53(469)AalenianBajoclanBoundary stratotypeAmmonites BiozonesCabo MondegoPortugalPaleontología2416 Paleontología