Abstract
The section has been logged on the southern slope of the Montejunto Mountain, near Cabanas de Torres (North of Tage River, Portugal). Typical ammonites of the Platynota zone with species-index Sutneria platynota ( Reinecke) have been found in the lower part of the «Marnes d'Abadia formation. Orthosphinctes and Desmoides subzones of early Kimmeridgian are paleontologically well characterized. Unlike what is usually thought, the lower Kimmeridgian does occur. More fossiliferous beds of the «Marnocalcaires de Tojeira formation are coincident with Upper Oxfordian (Planula zone and Upper part of the Bimammatum zone). They yield Ardescia gr. enayi Atrops which appear earlier in Portugal than in South-eastern France.
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