A very large pterosaur cervical vertebra is described from the Upper Maastrichtian deposits of Mérigon, in the foothills of the French Pyrenees. It resembles the vertebrae of Quetzalcoatlus, from the Maastrichtian of Texas, more than those of Arambourgiania, from the Maastrichtian of Jordan. The estimated wing span of the Mérigon pterosaur is close to 9 m, which makes it one of the largest known flying creatures. Giant pterosaurs still had a wide geographical distribution at the end of Maastrichtian time, which is not suggestive of a declining group, although it is difficult to obtain an accurate estimate of taxonomic diversity of terminal Cretaceous pterosaurs on the basis of available data.
Sur le versant nord des Pyrénées, l'apparition des faciès continentaux, correspondant pro parte au Garumnien de Leymerie, s'échelonne d'Est en Ouest depuis le Campanien jusqu'au Maastrichtien supérieur où ils s'imbriquent dans des faciès marins (Marnes d'Auzas, Petites Pyrénées).
Aux formations détritiques hétérogènes qui accompagnent la régression succède une sédimentation carbonatée, lacustre ou palustre. La découverte de nouveaux éléments de datation (Cha-rophytes, Gastéropodes, Ostracodes et Dinosauriens) infirme l'idée d'un synchronisme des calcaires qui en résultent, de plus en plus récents vers l'Ouest où ils franchissent la limite Crétacé-Tertiaire.
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