The titanosaur sauropods from the Allen Formation of Salitral Moreno, Río Negro, Argentina
Publicado por Leonardo Filippi en 14:19
Rodolfo García y Leonardo Salgado
The
dinosaur record of the Salitral Moreno locality (Río Negro Province, Argentina)
is characterized by a high diversity of herbivore taxa, among them hadrosaurs, ankylosaurs,
and titanosaur sauropods, but carnivores are rare, consisting of only a few
fragmentary bones of small forms. Titanosaurs are represented by Rocasaurus
muniozi and Aeolosaurus sp., and at least four other taxa,
represented by fragmentary material. The elements preserved include a cervical,
dorsal and caudal vertebrae, chevron, humerii, ulnae, radii, metacarpal,
femora, tibiae, metatarsal, ischia, pubis, and ilium. The Allen Formation is
thought to be correlated with the Marília Formation in Brazil, and their faunas
have certain elements in common such as aeolosaurines, but saltasaurines and
hadrosaurs, are known exclusively from the Allen Formation. These absences, and
particularly that of the saltasaurines, may be because those sauropods
originated late in the Cretaceous, probably in southern South America (Northern
Patagonia?), and they did not have time to disperse to northern South America.
Garcia, R.A. and
Salgado, L. 2013. The titanosaur sauropods from the late Campanian–early Maastrichtian
Allen Formation of Salitral Moreno, Río Negro, Argentina. Acta
Palaeontologica Polonica 58 (2): 269–284.
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