INVESTIGADORES
O'GORMAN Jose Patricio
artículos
Título:
PLESIOSAURS (DIAPSIDA, SAUROPTERYGIA) FROM LATE CRETACEOUS (LATE CAMPANIAN?EARLY MAASTRICHTIAN) MARGINAL MARINE ENVIRONMENTS FROM NORTH PATAGONIA
Autor/es:
O'GORMAN, J.P.
Revista:
Publicaciones Especiales de la APA
Editorial:
Comite Editoria APA
Referencias:
Año: 2015 vol. 1
ISSN:
2469-0228
Resumen:
During the late Campanian and early Maastrichtian, Northern Patagonia suffered the first stage of the Atlantic marine ingression that reached the Neuquén Basin. The Allen and La Colonia formations show the early stages of this change, and were deposited in a complex association of marginal marine environments, including coastal and marine deposits (i.e., flood plains, estuaries and lagoons). The plesiosaurs from the Allen and La Colonia formations included at least three species, each with a distinctive morphotype, representing a high diversity in the Late Cretaceous. The only species that preserved cranial material, Sulcusuchus erraini Gasparini and Spalleti, is a strange polycotylid characterizedby the presence of deep grooves in the rostrum and mandible. The other two species correspond to aristonectine and non-aristonectine elasmosaurids. The former are distinguished by relatively large skulls and a high number of teeth compared to other elasmosaurids, whereas the non-aristonectine elasmosaurids are characterized by their relatively small body sizes, despite being adult specimens.
