Authors: Currie, Philip J.; Carabajal, Ariana P.; Coria, Rodolfo A.

Source: Canadian Journal of Earth Sciences, Volume 43, Number 9, September 2006 , pp. 1283-1289(7)

Publisher: NRC Research Press

Abstract:

The Argentinean record of abelisauroid theropods begins in the Early Cretaceous (Ligabueino) and spans most of the Late Cretaceous, from Cenomanian (Ilokelesia, Xenotarsosaurus, and Ekrixinatosaurus) to Campanian-Maastrichtian (Abelisaurus, Carnotaurus, Aucasaurus, and Noasaurus). A fragmentary specimen of a theropod dinosaur was collected in 2000 from the middle section of the Lisandro Formation (Turonian?) at Cerro Bayo Mesa, Neuquén Province, Argentina. The fossil-bearing level, which is part of the Lisandro Formation that also yielded the remains of the basal ornithopod Anabisetia saldiviai, corresponds to a reddish, massive mudstone linked with fluvial channel deposits. The theropod identified as MCF-PVPH-237 is an abelisauroid theropod that increases our knowledge about the evolution of South American Abelisauroidea and is the first record of this clade from the Lisandro Formation.

Le registre argentin des théropodes abélisauroïdes commence au Crétacé précoce (Ligabueino) et s'étend sur presque tout le Crétacé tardif, du Cénomanien (Ilokelesia,Xenotarsosaurus et Ekrixinatosaurus) au Campanien-Maastrichtien (Abelisaurus, Carnotaurus, Aucasaurus et Noasaurus). Un spécimen fragmentaire d'un dinosaure théropode a été prélevé en 2000 de la section médiane de la Formation de Lisandro (Turonien?) à Cerro Bayo Mesa, dans la province de Neuquén (Argentine). Le niveau fossilifère, qui fait partie de la Formation de Lisandro dans laquelle des restes de l'ornithopode basal Anabisetia saldiviai ont également été retrouvés, correspond à une argilite massive rougeâtre associée à des dépôts de chenaux fluviaux. Le théropode, un abélisauroïde désigné MCF-PVPH-237, vient accroître les connaissances concernant l'évolution des Abélisauroïdés sud-américains et constitue le premier cas connu de ce clade dans la Formation de Lisandro.[Traduit par la Rédaction]

Document Type: Research article

Publication date: 2006-09-01

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