Transitional environments of the lower Maastrichtian South-Pyrenean Basin (Catalonia,Spain): The Fumanya Member tidal flat |
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Institution: | 1. Division of Stratigraphy, Department of Earth Sciences, University of Zaragoza, Calle Pedro Cerbuna 12, 50009 Zaragoza, Spain;2. Department of Earth and Ocean Dynamics, University of Barcelona, Campus de Pedralbes, 08028 Barcelona, Spain |
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Abstract: | Sedimentological, palaeontological and geochemical data provide detailed evidence of a marine-to-lagoon environmental succession around the Campanian-Maastrichtian boundary in the Ibero-Armorican domain. This regression is recorded by the succession of several environments of the south-central Pyrenees basin: open marine mixed shelf, marine restricted mixed shelf (both rudist-rich), tidal flat, lagoon and fluvial dominated. The tidal flat setting belongs to the Fumanya Member here described, which is the base of the Posa and Massana formations (Tremp Group). The Fumanya Member is 5 m thick, is built up of marly limestones and was an elongated tidal mudflat (100 km long, 25 km wide) developed in a foreland trough and was separated from the Atlantic Ocean by an island-barrier system. In the lagoon environment, marginal marine waters and continental fresh waters alternated as documented by geochemistry and fossil molluscs. The Fumanya Member is a dinosaur megatracksite, reporting the roaming activity only of sauropods in tidal flats, a likely secure area against predators. Feeding activity of these herbivores took place in the lagoonal-lacustrine environments of the Posa Formation above the Fumanya Member. |
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Keywords: | Tidal flat Sedimentology Brontopodus ichnofacies Pyrenees Cretaceous Foreland basin |
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