Taphonomic analysis and paleobiological observations of Crossvallia unienwillia Tambussi et al. 2005, the Oldest Penguin from Antarctica

The purpose of this paper is to provide a taphonomic analysis of the holotype of Crossvallia unienwillia Tambussi, Reguero, Marenssi and Santillana, 2005, in order to improve the knowledge of the vertebrate record of the Cross Valley Formation, a unit exposed in the central area of Marambio (Seymour...

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Detalles Bibliográficos
Autores principales:	Marenssi, Sergio Alfredo, Reguero, Marcelo A.
Publicado:	2016
Materias:	Antarctic Peninsula Cross Valley Fossil penguin Marambio Island Paleocene bone depositional environment fossil record macroinvertebrate paleobiology paleoenvironment preservation reconstruction seabird shark skeleton taphonomy X-ray diffraction Antarctica Seymour Island West Antarctica Chondrichthyes Spheniscidae Vertebrata
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v53_n3_p282_Hospitaleche http://hdl.handle.net/20.500.12110/paper_00027014_v53_n3_p282_Hospitaleche
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00027014_v53_n3_p282_Hospitaleche
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spelling	paper:paper_00027014_v53_n3_p282_Hospitaleche2023-06-08T14:22:31Z Taphonomic analysis and paleobiological observations of Crossvallia unienwillia Tambussi et al. 2005, the Oldest Penguin from Antarctica Marenssi, Sergio Alfredo Reguero, Marcelo A. Antarctic Peninsula Cross Valley Fossil penguin Marambio Island Paleocene bone depositional environment fossil record macroinvertebrate paleobiology Paleocene paleoenvironment preservation reconstruction seabird shark skeleton taphonomy X-ray diffraction Antarctic Peninsula Antarctica Seymour Island West Antarctica Chondrichthyes Spheniscidae Vertebrata The purpose of this paper is to provide a taphonomic analysis of the holotype of Crossvallia unienwillia Tambussi, Reguero, Marenssi and Santillana, 2005, in order to improve the knowledge of the vertebrate record of the Cross Valley Formation, a unit exposed in the central area of Marambio (Seymour) Island, Antarctic Peninsula. Analyses of the preservational state of the skeleton assigned to Crossvallia unienwillia offer important data for palaeoenvironmental and depositional reconstructions, key for the understanding of the early evolutionary history of penguins. Different techniques, including petrographic sections, SEM observation, Secondary Electrons Detectors, backscattered electrons detectors, microanalysis for probe of electrons, and X-ray diffraction were applied in order to distinguish biostratinomic from fossil diagenetic damage. Fossil bones of Crossvallia are associated with a typical marine assemblage including shark remains and macroinvertebrates. The hosting mudstones suggest a low-energy environment either below the wave-base or protected from wave action. In any case initial marine conditions changed to other with regular influx of land-derived sedimentary material. Crossvallia unienwillia was a female diver that passed through several molting periods before death. Biostratinomic processes consistent with little transport and rapid burial which would have prevented the action of destructive processes such as weathering and carnivores or scavenging, are inferred. The rapid burial favored the initial preservation of the elements under anoxic conditions. The surficial corrosion, fractures, and the internal filling of the cavities, suggest that destructive processes were only important after final burial during the telodiagenetic stage. The absence of more vertebrate fossil remains in the Cross Valley C Allomember is the result of those destructive processes, whereas on the contrary the original depositional environment appears to have been optimal. Fil:Marenssi, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Reguero, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v53_n3_p282_Hospitaleche http://hdl.handle.net/20.500.12110/paper_00027014_v53_n3_p282_Hospitaleche
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Antarctic Peninsula Cross Valley Fossil penguin Marambio Island Paleocene bone depositional environment fossil record macroinvertebrate paleobiology Paleocene paleoenvironment preservation reconstruction seabird shark skeleton taphonomy X-ray diffraction Antarctic Peninsula Antarctica Seymour Island West Antarctica Chondrichthyes Spheniscidae Vertebrata
spellingShingle	Antarctic Peninsula Cross Valley Fossil penguin Marambio Island Paleocene bone depositional environment fossil record macroinvertebrate paleobiology Paleocene paleoenvironment preservation reconstruction seabird shark skeleton taphonomy X-ray diffraction Antarctic Peninsula Antarctica Seymour Island West Antarctica Chondrichthyes Spheniscidae Vertebrata Marenssi, Sergio Alfredo Reguero, Marcelo A. Taphonomic analysis and paleobiological observations of Crossvallia unienwillia Tambussi et al. 2005, the Oldest Penguin from Antarctica
topic_facet	Antarctic Peninsula Cross Valley Fossil penguin Marambio Island Paleocene bone depositional environment fossil record macroinvertebrate paleobiology Paleocene paleoenvironment preservation reconstruction seabird shark skeleton taphonomy X-ray diffraction Antarctic Peninsula Antarctica Seymour Island West Antarctica Chondrichthyes Spheniscidae Vertebrata
description	The purpose of this paper is to provide a taphonomic analysis of the holotype of Crossvallia unienwillia Tambussi, Reguero, Marenssi and Santillana, 2005, in order to improve the knowledge of the vertebrate record of the Cross Valley Formation, a unit exposed in the central area of Marambio (Seymour) Island, Antarctic Peninsula. Analyses of the preservational state of the skeleton assigned to Crossvallia unienwillia offer important data for palaeoenvironmental and depositional reconstructions, key for the understanding of the early evolutionary history of penguins. Different techniques, including petrographic sections, SEM observation, Secondary Electrons Detectors, backscattered electrons detectors, microanalysis for probe of electrons, and X-ray diffraction were applied in order to distinguish biostratinomic from fossil diagenetic damage. Fossil bones of Crossvallia are associated with a typical marine assemblage including shark remains and macroinvertebrates. The hosting mudstones suggest a low-energy environment either below the wave-base or protected from wave action. In any case initial marine conditions changed to other with regular influx of land-derived sedimentary material. Crossvallia unienwillia was a female diver that passed through several molting periods before death. Biostratinomic processes consistent with little transport and rapid burial which would have prevented the action of destructive processes such as weathering and carnivores or scavenging, are inferred. The rapid burial favored the initial preservation of the elements under anoxic conditions. The surficial corrosion, fractures, and the internal filling of the cavities, suggest that destructive processes were only important after final burial during the telodiagenetic stage. The absence of more vertebrate fossil remains in the Cross Valley C Allomember is the result of those destructive processes, whereas on the contrary the original depositional environment appears to have been optimal.
author	Marenssi, Sergio Alfredo Reguero, Marcelo A.
author_facet	Marenssi, Sergio Alfredo Reguero, Marcelo A.
author_sort	Marenssi, Sergio Alfredo
title	Taphonomic analysis and paleobiological observations of Crossvallia unienwillia Tambussi et al. 2005, the Oldest Penguin from Antarctica
title_short	Taphonomic analysis and paleobiological observations of Crossvallia unienwillia Tambussi et al. 2005, the Oldest Penguin from Antarctica
title_full	Taphonomic analysis and paleobiological observations of Crossvallia unienwillia Tambussi et al. 2005, the Oldest Penguin from Antarctica
title_fullStr	Taphonomic analysis and paleobiological observations of Crossvallia unienwillia Tambussi et al. 2005, the Oldest Penguin from Antarctica
title_full_unstemmed	Taphonomic analysis and paleobiological observations of Crossvallia unienwillia Tambussi et al. 2005, the Oldest Penguin from Antarctica
title_sort	taphonomic analysis and paleobiological observations of crossvallia unienwillia tambussi et al. 2005, the oldest penguin from antarctica
publishDate	2016
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v53_n3_p282_Hospitaleche http://hdl.handle.net/20.500.12110/paper_00027014_v53_n3_p282_Hospitaleche
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Taphonomic analysis and paleobiological observations of Crossvallia unienwillia Tambussi et al. 2005, the Oldest Penguin from Antarctica

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