La Formation des Sables Fauves: dynamique sédimentaire au Miocène moyen et évolution morpho-structurale de l’Aquitaine (SW France) durant le Néogène

Denudation history and palaeogeography of the Pyrenees and their peripheral basins: an 84-million-year geomorphological perspective

“…According to some authors, the gulf of Lectoure was a Serravallian feature (Cahuzac et al, 1995;Cahuzac and Poignant, 1996), whereas for others this marine highstand occurred in Langhian time, the Serravallian ingress being the lesser of the two eustatic rises. Because of local flexural deformations in the Aquitaine Basin itself ('Celtaquitanian flexure'), the Serravallian deposits occur as a series of drowned valley fills cut into the northern edge of the marine Langhian series and its underlying Aquitanian molasse (i.e., the 'trilogie agenaise') (Magné et al, 1985;Rey et al, 1997;Gardère, 2002Gardère, , 2005Gardère et al, 2002;Gardère and Pais, 2007). The southward migration of the marine depocentre as a result of this tectonic downwarp, which influenced the positions of two successive palaeoshoreline highstands, could be the manifestation of a slight reactivation of Pyrenean retro-wedge crustal loading during the middle Miocene.…”