DIENTES DE DINOSAURIOS TERÓPODOS Y SAURÓPODOS DE LA FORMACIÓN CERRO LISANDRO (CENOMANIENSE SUPERIOR-TURONIENSE INFERIOR, CRETÁCICO SUPERIOR) EN RÍO NEGRO, ARGENTINA

JOSÉ I. CANUDO, LEONARDO SALGADO, JOSÉ L. BARCO, RAÚL BOLATTI, Y JOSÉ I. RUIZ-OMEÑACA

GEO-TEMAS

Sociedad Geológica de España

Lugar: Madrid; Año: 2004 vol. 6 p. 31 - 34

1576-5172

A joint team of the Universidad Nacional del Comahue, the "Ente para el Desarrollo de la Margen Sur-ENDEMAS" (Argentina) and the Universidad de Zaragoza (Spain) has started paleontological fieldwork in the previously unexplored area of El Anfiteatro, 50 km southwest to the town of Cipolletti, in the Río Negro Province, Argentina. One of the new discovered localities has provided six dinosaur teeth, which are described in this paper. These teeth come from the Cerro Lisandro Formation, a unit of upper Cenomanian-lower Turonian are belonging to the Neuquén Group, Río Limay Subgroup. The only dinosaur ptreviously known in the Cerro Lisandro Formation was the ornithopod Anabisetia, from the neighbouring province of Neuquén. The studied teeth belong to a sauropod: Titanosauria indet. (a slender and cylindrical tooth fragment), and three theropods: Carcharodontosauridae indet. (a tooth with wrinkled enamel), Spinosauridae indet. (a tooth with fluted enamel), and Abelisauria? indet. (three unornamented teeth). These teeth represent the first saurischian dinosaurs in the Cerro Lisandro Formation. Titanosaurs, carcharodontosaurids, and abelisaurs are well known in the lowermost Upper Cretaceous of Argentina, but the Cerro Lisandro spinosaurid is the first representative of this family in the Upper Cretaceous of South America.