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dc.contributor.author Inglez, L.
dc.contributor.author Warren, L. V.
dc.contributor.author Okubo, J.
dc.contributor.author Simões, M. G.
dc.contributor.author Quaglio, F.
dc.contributor.author Arrouy, Maria Julia
dc.contributor.author Netto, R. G.
dc.date.available 2019-08-13T20:37:00Z
dc.date.issued 2019-01
dc.identifier.citation Inglez, L.; Warren, L. V.; Okubo, J.; Simões, M. G.; Quaglio, F.; et al.; Discs and discord: The paleontological record of Ediacaran discoidal structures in the south American continent; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 89; 1-2019; 319-336
dc.identifier.issn 0895-9811
dc.identifier.uri http://hdl.handle.net/11336/81584
dc.description.abstract Discoidal sedimentary structures are commonly described in Proterozoic strata, and even more common in Ediacaran to lower Cambrian sedimentary successions. Many abiotic processes are able to produce such circular or discoidal structures in bedding planes, however, their abundance in Ediacaran strata suggests a possible correlation with the evolution and preservation of epibenthic metazoans that emerged at the end of this period. In the South American paleontological record, studies regarding the Ediacaran soft-bodied organisms are meager and restricted to few reports in Brazil, Paraguay, and Argentina. In many cases, such “fossils” were only tentatively characterized in terms of their general morphology and putative taxonomic affinity. Thus, considering the almost absence of work on these enigmatic structures in South America, this paper aims to make a critical analysis on the main occurrences of Ediacaran-Cambrian discoidal structures described in this continent. Based on a detailed review and unpublished data, it was possible to provide a general picture concerning the main paleoenvironmental and sedimentary significance of this structures, as well as on the most promising prospects in terms of the paleontological record of Ediacaran soft-bodied metazoans in South American. In this sense, it was settled that occurrences such as those in the Jaibaras and Itajaí basins should be reassessed in order to establish reliable criteria of biogenicity. In the case of the material from the Sete Lagoas and Tagatiya Guazu formations, it is considered more parsimonious to interpret the discoidal features as resulting from microbial processes. Similarly, the discoidal structures of the Cerro Negro Formation presents a series of internal laminations and textures that resembles those developed by processes of microbial grain binding and trapping suggesting that, at least part of this material, can be related to microbially induced sedimentary structures. Finally, for the ichnologically diversified Puncoviscana and Camaquã basins, two different scenarios were identified. The first presents an ichnological assemblage strongly indicative of lower Paleozoic, and possibly Cambrian affinity. Thus, the discs in association with these traces, should be viewed with caution and interpretations made in light of a Paleozoic context. The second possesses an ichnological association typical of that expected for the Ediacaran-Cambrian transition, and the diversity of discoidal forms can potentially represent imprints of macroorganisms on a microbially bounded substrate, thus deserving a more detailed approach.
dc.format application/pdf
dc.language.iso eng
dc.publisher Pergamon-Elsevier Science Ltd
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject BIOGENICITY CRITERIA
dc.subject DUBIOFOSSILS
dc.subject EDIACARAN BIOTAS
dc.subject EDIACARAN GEOBIOLOGY
dc.subject.classification Paleontología
dc.subject.classification Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.title Discs and discord: The paleontological record of Ediacaran discoidal structures in the south American continent
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2019-07-24T17:42:19Z
dc.journal.volume 89
dc.journal.pagination 319-336
dc.journal.pais Estados Unidos
dc.description.fil Fil: Inglez, L.. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
dc.description.fil Fil: Warren, L. V.. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
dc.description.fil Fil: Okubo, J.. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
dc.description.fil Fil: Simões, M. G.. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
dc.description.fil Fil: Quaglio, F.. Universidade de Sao Paulo; Brasil
dc.description.fil Fil: Arrouy, Maria Julia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
dc.description.fil Fil: Netto, R. G.. Universidade do Vale do Rio dos Sinos; Brasil
dc.journal.title Journal of South American Earth Sciences
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981118302797
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jsames.2018.11.023
dc.conicet.fuente individual


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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)