Ediacaran discs from South America: probable soft-bodied macrofossils unlock the paleogeography of the Clymene Ocean

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The origin, affinity and paleoecology of macrofossils of soft-bodied organisms of the terminal Ediacaran Period have been highly debated. Previous discoveries in South America are restricted to small shelly metazoans of the Nama Assemblage. Here we report for the first time the occurrence of discoid...

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Autores principales: Arrouy, María Julia, Warren, Lucas V., Quaglio, Fernanda, Poiré, Daniel Gustavo, Simões, Marcello Guimarães, Rosa, Milena Boselli, Gómez Peral, Lucía Elena
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Naturales
Ediacaran Period
South America
soft-bodied organisms
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/86728
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-86728
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Ediacaran Period
South America
soft-bodied organisms
spellingShingle Ciencias Naturales
Ediacaran Period
South America
soft-bodied organisms
Arrouy, María Julia
Warren, Lucas V.
Quaglio, Fernanda
Poiré, Daniel Gustavo
Simões, Marcello Guimarães
Rosa, Milena Boselli
Gómez Peral, Lucía Elena
Ediacaran discs from South America: probable soft-bodied macrofossils unlock the paleogeography of the Clymene Ocean
topic_facet Ciencias Naturales
Ediacaran Period
South America
soft-bodied organisms
description The origin, affinity and paleoecology of macrofossils of soft-bodied organisms of the terminal Ediacaran Period have been highly debated. Previous discoveries in South America are restricted to small shelly metazoans of the Nama Assemblage. Here we report for the first time the occurrence of discoidal structures from the Upper Ediacaran Cerro Negro Formation, La Providencia Group, Argentina. Specimens are preserved in tabular sandstones with microbially-induced sedimentary structures. Flute marks and linear scours at the base of the sandstone layers indicate deposition under high energy, episodic flows. Stratigraphic, sedimentologic, petrographic and taphonomic analyses indicate that the origin of these structures is not related to abiotic process. Preservational and morphological features, as invagination and the presence of radial grooves, indicate that they resemble typical morphs of the <i>Aspidella</i> plexus. The large number of small-sized individuals and the wide range of size classes with skewed distribution suggest that they lived in high-density communities. The presence of <i>Aspidella</i> in the Cerro Negro Formation would represent the first reliable record of Ediacaran soft-bodied organisms in South America. It also supports the paleogeographic scenario of the Clymene Ocean, in which a shallow sea covered part of the southwest Gondwana at the end of the Ediacaran.
format Articulo
Articulo
author Arrouy, María Julia
Warren, Lucas V.
Quaglio, Fernanda
Poiré, Daniel Gustavo
Simões, Marcello Guimarães
Rosa, Milena Boselli
Gómez Peral, Lucía Elena
author_facet Arrouy, María Julia
Warren, Lucas V.
Quaglio, Fernanda
Poiré, Daniel Gustavo
Simões, Marcello Guimarães
Rosa, Milena Boselli
Gómez Peral, Lucía Elena
author_sort Arrouy, María Julia
title Ediacaran discs from South America: probable soft-bodied macrofossils unlock the paleogeography of the Clymene Ocean
title_short Ediacaran discs from South America: probable soft-bodied macrofossils unlock the paleogeography of the Clymene Ocean
title_full Ediacaran discs from South America: probable soft-bodied macrofossils unlock the paleogeography of the Clymene Ocean
title_fullStr Ediacaran discs from South America: probable soft-bodied macrofossils unlock the paleogeography of the Clymene Ocean
title_full_unstemmed Ediacaran discs from South America: probable soft-bodied macrofossils unlock the paleogeography of the Clymene Ocean
title_sort ediacaran discs from south america: probable soft-bodied macrofossils unlock the paleogeography of the clymene ocean
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/86728
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