Le gisement vraconnien (albien superieur) de la selva de bonansa (pyrenees espagnoles): interet stratigraphique, paleoecologique et paleobiogeographique
Abstract The Vraconian deposit (Upper Albian Stoliczkaia dispar zone) of La Selva de Bonansa in the South Pyrenean Zone (Spain), has been revised by a group of paleontologists. More than fifty species have been found: ammonites, lamellibranchs, gastropods, brachiopods, echinoids and foraminifers. Some of these organisms belong to the North Temperature Realm and others to the Tethyan Realm. The deposit is situated on a hard-ground which was the external limit of the calcareous continental shelf, i.e. the equivalent upper circalittoral bathymetric zone and the external part of the infralittoral zone. This is shown by the associations of invertebrates. The fauna identified at Bonansa also shows the stratigraphical value of some species which lived only during the Late Vraconian, or in the Early Cenomanian, or crossing the Albian-Cenomanian boundary.