Nouvelles espèces d'ostracodes de l'Albien et du Cénomanien d'Estremadura (Portugal)

Abstract

Key-words: Ostracodes - datation - associations - middles of living - palaeobiogeography - Albian - Cenomanian - Portugal Exarnination of samples from eight outcrops from Albian and Cenamanian of Estremadura, induced to take a census of sixty-two species and subspecies of Ostracodes among which fifteen are new and described here. Their associations permited - first, to characterize three faunislic sets: a lower and middle Albian set with a mediolittoral and infralittoral (shallow marine) sedimentation; an upper Albian s.l. (near formations of Rudists); a lagoonal lower Cenomanian; - on the other hand, to state local comparisons with the middle Cretaceous of southern France, of the South-pyrenean Zone (Sierra d'Aulet: district of Sopeira), of the district of Oviedo (nord-western Spain), and of the Aragonese Iberian Range (Aragon and Maestrazgo), placing in a prominent position faunistic exchanges of Ostracodes between the above-mentioned regions and the Estremadura, during the lower Cenomanian.