Large tetrapod burrows from the Middle Triassic of Argentina: A behavioural adaptation to seasonal semi-arid climate?

We report the discovery of large burrow casts in the early Middle Triassic Tarjados Formation, at Talampaya National Park, north-western Argentina. Facies analysis indicates the burrows are preserved in sandbars deposited by an ephemeral river under semi-arid and seasonal climatic conditions. The st...

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Autores principales:	Krapovickas, Veronica, Mancuso, Adriana Cecilia, Marsicano, Claudia Alicia, Domnanovich, Nadia Sonia
Publicado:	2013
Materias:	burrowing organism facies analysis morphology paleoclimate paleosurface Permian semiarid region tetrapod Triassic Argentina Invertebrata Mammalia Tetrapoda Therapsida Vertebrata
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00241164_v46_n2_p154_Krapovickas http://hdl.handle.net/20.500.12110/paper_00241164_v46_n2_p154_Krapovickas
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00241164_v46_n2_p154_Krapovickas
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spelling	paper:paper_00241164_v46_n2_p154_Krapovickas2023-06-08T14:51:55Z Large tetrapod burrows from the Middle Triassic of Argentina: A behavioural adaptation to seasonal semi-arid climate? Krapovickas, Veronica Mancuso, Adriana Cecilia Marsicano, Claudia Alicia Domnanovich, Nadia Sonia burrowing organism facies analysis morphology paleoclimate paleosurface Permian semiarid region tetrapod Triassic Argentina Invertebrata Mammalia Tetrapoda Therapsida Vertebrata We report the discovery of large burrow casts in the early Middle Triassic Tarjados Formation, at Talampaya National Park, north-western Argentina. Facies analysis indicates the burrows are preserved in sandbars deposited by an ephemeral river under semi-arid and seasonal climatic conditions. The structures are mostly preserved in longitudinal cross-section and consist of an opening, an inclined tunnel (ramp), and a terminal chamber. The ramp is 8-14cm in height, up to 130cm in length and penetrates 49-63cm bellow the palaeosurface with an inclination of 22°-30°. We studied burrow cast dimensions, overall architectural morphology, surficial marks, and compared them with other large burrows of both invertebrate and vertebrate origin. A tetrapod origin of the burrow casts was established based on: distinctive architecture, and size, which is more than twice the most common size range for large terrestrial invertebrate burrows. Comparison with other Upper Permian and Triassic tetrapod burrows allows us to identify three general morphological groups: (1) simple inclined burrows; (2) helical burrows; and (3) burrow network complexes, representing different behaviours. A study of tetrapod body fossils preserved within other Upper Permian and Triassic burrows shows that the Tarjados structures were most likely produced by non-mammalian cynodonts. The environmental and climatic context suggests that aridity and seasonality played a fundamental role selecting burrowing behaviour in therapsids and that by the Early-Middle Triassic their burrowing behaviour attained a complexity comparable to modern mammals. □Argentina, behaviour, palaeoclimate, Permo-Triassic, Tarjados Formation, Tetrapod burrows. © 2012 The Authors, Lethaia © 2012 The Lethaia Foundation. Fil:Krapovickas, V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mancuso, A.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Marsicano, C.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Domnanovich, N.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00241164_v46_n2_p154_Krapovickas http://hdl.handle.net/20.500.12110/paper_00241164_v46_n2_p154_Krapovickas
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	burrowing organism facies analysis morphology paleoclimate paleosurface Permian semiarid region tetrapod Triassic Argentina Invertebrata Mammalia Tetrapoda Therapsida Vertebrata
spellingShingle	burrowing organism facies analysis morphology paleoclimate paleosurface Permian semiarid region tetrapod Triassic Argentina Invertebrata Mammalia Tetrapoda Therapsida Vertebrata Krapovickas, Veronica Mancuso, Adriana Cecilia Marsicano, Claudia Alicia Domnanovich, Nadia Sonia Large tetrapod burrows from the Middle Triassic of Argentina: A behavioural adaptation to seasonal semi-arid climate?
topic_facet	burrowing organism facies analysis morphology paleoclimate paleosurface Permian semiarid region tetrapod Triassic Argentina Invertebrata Mammalia Tetrapoda Therapsida Vertebrata
description	We report the discovery of large burrow casts in the early Middle Triassic Tarjados Formation, at Talampaya National Park, north-western Argentina. Facies analysis indicates the burrows are preserved in sandbars deposited by an ephemeral river under semi-arid and seasonal climatic conditions. The structures are mostly preserved in longitudinal cross-section and consist of an opening, an inclined tunnel (ramp), and a terminal chamber. The ramp is 8-14cm in height, up to 130cm in length and penetrates 49-63cm bellow the palaeosurface with an inclination of 22°-30°. We studied burrow cast dimensions, overall architectural morphology, surficial marks, and compared them with other large burrows of both invertebrate and vertebrate origin. A tetrapod origin of the burrow casts was established based on: distinctive architecture, and size, which is more than twice the most common size range for large terrestrial invertebrate burrows. Comparison with other Upper Permian and Triassic tetrapod burrows allows us to identify three general morphological groups: (1) simple inclined burrows; (2) helical burrows; and (3) burrow network complexes, representing different behaviours. A study of tetrapod body fossils preserved within other Upper Permian and Triassic burrows shows that the Tarjados structures were most likely produced by non-mammalian cynodonts. The environmental and climatic context suggests that aridity and seasonality played a fundamental role selecting burrowing behaviour in therapsids and that by the Early-Middle Triassic their burrowing behaviour attained a complexity comparable to modern mammals. □Argentina, behaviour, palaeoclimate, Permo-Triassic, Tarjados Formation, Tetrapod burrows. © 2012 The Authors, Lethaia © 2012 The Lethaia Foundation.
author	Krapovickas, Veronica Mancuso, Adriana Cecilia Marsicano, Claudia Alicia Domnanovich, Nadia Sonia
author_facet	Krapovickas, Veronica Mancuso, Adriana Cecilia Marsicano, Claudia Alicia Domnanovich, Nadia Sonia
author_sort	Krapovickas, Veronica
title	Large tetrapod burrows from the Middle Triassic of Argentina: A behavioural adaptation to seasonal semi-arid climate?
title_short	Large tetrapod burrows from the Middle Triassic of Argentina: A behavioural adaptation to seasonal semi-arid climate?
title_full	Large tetrapod burrows from the Middle Triassic of Argentina: A behavioural adaptation to seasonal semi-arid climate?
title_fullStr	Large tetrapod burrows from the Middle Triassic of Argentina: A behavioural adaptation to seasonal semi-arid climate?
title_full_unstemmed	Large tetrapod burrows from the Middle Triassic of Argentina: A behavioural adaptation to seasonal semi-arid climate?
title_sort	large tetrapod burrows from the middle triassic of argentina: a behavioural adaptation to seasonal semi-arid climate?
publishDate	2013
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00241164_v46_n2_p154_Krapovickas http://hdl.handle.net/20.500.12110/paper_00241164_v46_n2_p154_Krapovickas
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_version_	1768545541952634880

Large tetrapod burrows from the Middle Triassic of Argentina: A behavioural adaptation to seasonal semi-arid climate?

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