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Artículo

The Chañares formation: A window to a Middle Triassic tetrapod community

Mancuso, Adriana CeciliaIcon ; Gaetano, Leandro CarlosIcon ; Leardi, Juan MartínIcon ; Abdala, Nestor FernandoIcon ; Arcucci, Andrea Beatriz
Fecha de publicación: 04/2014
Editorial: Wiley Blackwell Publishing, Inc
Revista: Lethaia
ISSN: 0024-1164
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Meteorología y Ciencias Atmosféricas

Resumen

The Chañares Formation is known worldwide for its diverse and well-preserved Ladinian non-marine tetrapod assemblage, including a wide variety of archosauriform reptiles (proterochampsids, early offshoots of the crocodilian line and dinosaurian precursors) and synapsids represented by dicynodonts and cynodonts. This tetrapod record offers an opportunity to evaluate, within a taphonomic context, the palaeoecology of this Middle Triassic fauna. The taphonomic analysis of the Chañares assemblage, under precise stratigraphical control, indicates that it is a good representation of the original faunal composition allowing us to address the palaeoecological interactions between its components. Mass estimations and morphology-based palaeobiological inferences of Chañares tetrapods are used to reconstruct the trophic structure of the community. Chañares tetrapod fauna was numerically dominated by middle-sized herbivorous and small faunivorous cynodonts, whereas middle-sized faunivorous cynodonts and large dicynodonts were less common. In contrast to the therapsids, which show a low species-richness and high abundance, the archosauriforms are less abundant, but are the most taxonomically diverse group. The large paracrocodylomorphs (estimated body masses between 350 and 500 kg) are identified as the top predators of the community, and the traversodontid cynodonts and dicynodonts (estimated body masses reaching approximately 43 and 360 kg, respectively) are indentified as the base herbivores of the trophic pyramid. We conclude that the worldwide faunal composition in the Ladinian reveals two continental assemblages: an eastern Laurasian assemblage dominated by temnospondyl amphibians; and a western Gondwanan assemblage dominated by therapsids but including a wide diversity of archosauriforms.
Palabras clave: ChaÑAres Formation , Community Reconstruction , Ischigualasto-Villa Union Basin , Ladinian Faunas , Taphonomy
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/36772
URL: http://onlinelibrary.wiley.com/doi/10.1111/let.12055/abstract
DOI: http://dx.doi.org/10.1111/let.12055
Colecciones
Articulos(IANIGLA)
Articulos de INST. ARG. DE NIVOLOGIA, GLACIOLOGIA Y CS. AMBIENT
Articulos(IDEAN)
Articulos de INSTITUTO DE ESTUDIOS ANDINOS "DON PABLO GROEBER"
Citación
Mancuso, Adriana Cecilia; Gaetano, Leandro Carlos; Leardi, Juan Martín; Abdala, Nestor Fernando; Arcucci, Andrea Beatriz; The Chañares formation: A window to a Middle Triassic tetrapod community; Wiley Blackwell Publishing, Inc; Lethaia; 47; 2; 4-2014; 244-265
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