A Triassic tetrapod footprint assemblage from southern South America: Palaeobiogeographical and evolutionary implications

A new Triassic tetrapod track assemblage recorded from levels of the Cuyana Basin (west-central Argentina) is described. The tracks came from multiple track-bearing horizons of the Upper Triassic (Carnian) Portezuelo Formation that indicate recurrent playa to mudflat conditions in a marginal lacustr...

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Autores principales:	Marsicano, Claudia Alicia, Barredo, Silvia Patricia
Publicado:	2004
Materias:	Late Triassic Palaeobiogeography Phylogeny Tetrapod footprints West-central Argentina evolution footprint paleobiogeography phylogeny tetrapod Triassic Cuyana Dinosauria Mammalia Sauropodomorpha Tetrapoda Therapsida Theropoda
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00310182_v203_n3-4_p313_Marsicano http://hdl.handle.net/20.500.12110/paper_00310182_v203_n3-4_p313_Marsicano
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00310182_v203_n3-4_p313_Marsicano
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spelling	paper:paper_00310182_v203_n3-4_p313_Marsicano2023-06-08T14:56:36Z A Triassic tetrapod footprint assemblage from southern South America: Palaeobiogeographical and evolutionary implications Marsicano, Claudia Alicia Barredo, Silvia Patricia Late Triassic Palaeobiogeography Phylogeny Tetrapod footprints West-central Argentina evolution footprint paleobiogeography phylogeny tetrapod Triassic Cuyana Dinosauria Mammalia Sauropodomorpha Tetrapoda Therapsida Theropoda A new Triassic tetrapod track assemblage recorded from levels of the Cuyana Basin (west-central Argentina) is described. The tracks came from multiple track-bearing horizons of the Upper Triassic (Carnian) Portezuelo Formation that indicate recurrent playa to mudflat conditions in a marginal lacustrine succession. This footprint assemblage is the most important one described up to now for the lower Mesozoic of South America, and forms a significant estimate of the fauna represented during that time in the region. Therefore, in order to understand the faunal significance of the assemblage, the track-makers were identified within a phylogenetic context. Although at a coarse taxonomic level, this analysis indicates the presence of non-mammalian therapsids (small cynodonts and large dicynodonts) and a quite diverse archosaur fauna that includes members of both crurotarsal archosaurs and dinosaurs (sauropodomorphs and theropods). Comparisons between the studied assemblage and other Early Mesozoic tetrapod track records from Gondwana suggest close relationships with those described from the Upper Triassic of the Karoo Basin in South Africa. In addition, the presence of putative basal sauropodomorph dinosaur tracks in the Portezuelo levels suggests that the stratigraphic range of the group extends back into the Carnian, farther than that documented by the known body-fossil record of the group in western Gondwana. © 2003 Elsevier B.V. All rights reserved. Fil:Marsicano, C.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Barredo, S.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2004 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00310182_v203_n3-4_p313_Marsicano http://hdl.handle.net/20.500.12110/paper_00310182_v203_n3-4_p313_Marsicano
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Late Triassic Palaeobiogeography Phylogeny Tetrapod footprints West-central Argentina evolution footprint paleobiogeography phylogeny tetrapod Triassic Cuyana Dinosauria Mammalia Sauropodomorpha Tetrapoda Therapsida Theropoda
spellingShingle	Late Triassic Palaeobiogeography Phylogeny Tetrapod footprints West-central Argentina evolution footprint paleobiogeography phylogeny tetrapod Triassic Cuyana Dinosauria Mammalia Sauropodomorpha Tetrapoda Therapsida Theropoda Marsicano, Claudia Alicia Barredo, Silvia Patricia A Triassic tetrapod footprint assemblage from southern South America: Palaeobiogeographical and evolutionary implications
topic_facet	Late Triassic Palaeobiogeography Phylogeny Tetrapod footprints West-central Argentina evolution footprint paleobiogeography phylogeny tetrapod Triassic Cuyana Dinosauria Mammalia Sauropodomorpha Tetrapoda Therapsida Theropoda
description	A new Triassic tetrapod track assemblage recorded from levels of the Cuyana Basin (west-central Argentina) is described. The tracks came from multiple track-bearing horizons of the Upper Triassic (Carnian) Portezuelo Formation that indicate recurrent playa to mudflat conditions in a marginal lacustrine succession. This footprint assemblage is the most important one described up to now for the lower Mesozoic of South America, and forms a significant estimate of the fauna represented during that time in the region. Therefore, in order to understand the faunal significance of the assemblage, the track-makers were identified within a phylogenetic context. Although at a coarse taxonomic level, this analysis indicates the presence of non-mammalian therapsids (small cynodonts and large dicynodonts) and a quite diverse archosaur fauna that includes members of both crurotarsal archosaurs and dinosaurs (sauropodomorphs and theropods). Comparisons between the studied assemblage and other Early Mesozoic tetrapod track records from Gondwana suggest close relationships with those described from the Upper Triassic of the Karoo Basin in South Africa. In addition, the presence of putative basal sauropodomorph dinosaur tracks in the Portezuelo levels suggests that the stratigraphic range of the group extends back into the Carnian, farther than that documented by the known body-fossil record of the group in western Gondwana. © 2003 Elsevier B.V. All rights reserved.
author	Marsicano, Claudia Alicia Barredo, Silvia Patricia
author_facet	Marsicano, Claudia Alicia Barredo, Silvia Patricia
author_sort	Marsicano, Claudia Alicia
title	A Triassic tetrapod footprint assemblage from southern South America: Palaeobiogeographical and evolutionary implications
title_short	A Triassic tetrapod footprint assemblage from southern South America: Palaeobiogeographical and evolutionary implications
title_full	A Triassic tetrapod footprint assemblage from southern South America: Palaeobiogeographical and evolutionary implications
title_fullStr	A Triassic tetrapod footprint assemblage from southern South America: Palaeobiogeographical and evolutionary implications
title_full_unstemmed	A Triassic tetrapod footprint assemblage from southern South America: Palaeobiogeographical and evolutionary implications
title_sort	triassic tetrapod footprint assemblage from southern south america: palaeobiogeographical and evolutionary implications
publishDate	2004
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00310182_v203_n3-4_p313_Marsicano http://hdl.handle.net/20.500.12110/paper_00310182_v203_n3-4_p313_Marsicano
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A Triassic tetrapod footprint assemblage from southern South America: Palaeobiogeographical and evolutionary implications

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