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Published online by Cambridge University Press: 04 August 2010
Abstract
We have distinguished 10 depositional sequences in the Eocene succession of the eastern South Pyrenean Basin (Ilerdian to middle Lutetian). The lowermost sequences (Puig Aguiló and Fornols sequences) consist of shelfal carbonate facies (Alveolina limestones) in the eastern and western areas of the basin. In the central area, they consist of offshore marls. The Sagnari and Corones sequences are characterized by fluvio-deltaic deposits and shelfal carbonates. The Cadi, Armancies and Vail del Bac sequences consist of resedimented carbonates and offshore marls in the central parts of the Basin, and of carbonate platforms (Assilina limestones) in the marginal areas. The Vail del Bac sequence exposes a deltaic platform in the eastern area. The uppermost sequences (Campdevánol, Ripoll and Josa sequences) consist of deltaic platforms in the eastern area and of turbiditic systems in the western area.
The boundary between the Vail del Bac and Campdevanol sequences is related to an important paleogeographic change in the basin. The depositional systems of the sequences below this level display the proximal environments in the two terminations of the Basin, and the distal environments in the central areas. The depositional systems of the sequences above this level display the proximal environments in the eastern areas of the Basin, and the distal ones in the central and western areas.
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