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The Chañares Formation: a window to a Middle Triassic tetrapod community

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Abstract

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 herb…

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  • The Chañares Formation has yielded a diverse assemblage of tetrapods including a variety of archosaurs closely related to dinosaurs (Dinosauriformes).

    “The Agua de la Peña Group also encompasses several other Triassic-age continental deposits, one of which, the Chañares Formation, has yielded a diverse assemblage of tetrapods including a variety of archosaurs closely related to dinosaurs (Dinosauriformes) (8).”

    From Dating the origin of dinosaurs (2016) · cites this paper as [8]

  • The faunal assemblage of the Chañares Formation became the quintessential example of a Middle Triassic vertebrate community from Gondwana.

    “Its faunal assemblage became the quintessential example of a Middle Triassic vertebrate community from Gondwana (8).”

    From Dating the origin of dinosaurs (2016) · cites this paper as [8]

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Authors
Mancuso, A. C., Gaetano, L. C., Leardi, J. M., Abdala, F., & Arcucci, A. B.
Affiliations
  • Consejo Nacional de Investigaciones Científicas y Técnicas (AR)
  • University of the Witwatersrand (ZA)
  • National University of San Luis (AR)
Venue
Lethaia
Published
2014-04
Volume
47
Issue
2
Pages
244-265
ISSN
  • 0024-1164 (ISSN-L)
  • 1502-3931
OpenAlex
W2084803211
Cited by
71
References
0
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FWCI
3.16
Type
journal article
Language
en
Open access
Locations
  • Lethaia (publishedVersion)
  • CONICET Digital (CONICET) (submittedVersion, cc-by-nc-sa)
Funders
  • PIP CONICET (0535/98, 5120, 0209/10)
  • UBACyT (20020100100728)
  • Jurassic Foundation (PICT 32236)
  • Consejo Nacional de Investigaciones Científicas y Técnicas
  • National Research Foundation of South Africa
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Evolutionary Biology
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
Keywords
Chañares Formation, Middle Triassic, Ladinian, paleoecology, taphonomy, trophic structure, archosauriforms, dicynodonts, cynodonts, therapsids, body mass estimation, faunal composition, Laurasian, Gondwana

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Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

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