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dc.contributor.author
Inglez, Lucas
dc.contributor.author
Warren, Lucas V.
dc.contributor.author
Quaglio, Fernanda
dc.contributor.author
Netto, Renata G.
dc.contributor.author
Okubo, Juliana
dc.contributor.author
Arrouy, Maria Julia
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dc.contributor.author
Simões, Marcello G.
dc.contributor.author
Poiré, Daniel G.
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dc.date.available
2022-08-08T18:23:29Z
dc.date.issued
2021-05
dc.identifier.citation
Inglez, Lucas; Warren, Lucas V.; Quaglio, Fernanda; Netto, Renata G.; Okubo, Juliana; et al.; Scratching the discs: evaluating alternative hypotheses for the origin of the Ediacaran discoidal structures from the Cerro Negro Formation, La Providencia Group, Argentina; Cambridge University Press; Geological Magazine; 159; 7; 5-2021; 1192-1209
dc.identifier.issn
0016-7568
dc.identifier.uri
http://hdl.handle.net/11336/164601
dc.description.abstract
In the Ediacaran marine succession of the Cerro Negro Formation (Tandilia System, NE Argentina), abundant microbially induced sedimentary structures indicate general conditions of substrate biostabilization. Numerous discoidal structures in this succession were previously interpreted as moulds of soft-tissue holdfasts of sessile organisms, within the form genus Aspidella. In this study, we performed a detailed re-analysis of some of these features and discuss two alternative hypotheses to explain their genesis: (1) as the result of soft-sediment deformation and fluid injection structures; and (2) as structures of active animal–sediment interaction (i.e. trace fossils). We show that the dome-shaped discs are internally laminated, with a cylindrical to a funnel-shaped vertical tube at their central region. The presence of these downwards vertical extensions and other intricate internal arrangements cannot be explained under the taphonomic spectrum of discoidal fossils, but shows striking similarities to Intrites-like structures and other sand-volcano-like pseudofossils (e.g. Astropolithon). However, some structures are hard to distinguish from vertical dwelling burrows with funnel-shaped apertures and thick-lined walls, commonly produced by suspension- and detritus-feeding invertebrates (e.g. Skolithos isp., Monocraterion isp. and, less likely, Rosselia isp.). Since reliable age constraints are unavailable, and further investigation concerning other palaeobiological indicators is needed, the most parsimonious hypothesis is that of a structure derived from fluid-escape processes. Our study demonstrates the importance of detailed investigation on discoidal structures in either upper Ediacaran or lower Cambrian strata.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Cambridge University Press
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
ASPIDELLA-PLEXUS
dc.subject
EDIACARAN BIOTA
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SOFT-SEDIMENT DEFORMATION
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VERTICAL BURROWS
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Geología
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Scratching the discs: evaluating alternative hypotheses for the origin of the Ediacaran discoidal structures from the Cerro Negro Formation, La Providencia Group, Argentina
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2022-08-04T15:11:05Z
dc.journal.volume
159
dc.journal.number
7
dc.journal.pagination
1192-1209
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Cambridge
dc.description.fil
Fil: Inglez, Lucas. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
dc.description.fil
Fil: Warren, Lucas V.. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
dc.description.fil
Fil: Quaglio, Fernanda. Universidade Federal de Sao Paulo; Brasil
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Fil: Netto, Renata G.. Universidad de Vale do Rio dos Sinos; Brasil
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Fil: Okubo, Juliana. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
dc.description.fil
Fil: Arrouy, Maria Julia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil; Argentina. Universidad Nacional del Centro de la Provincia de Buenos Aires. Rectorado. Instituto de Hidrología de Llanuras - Sede Azul. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Hidrología de Llanuras - Sede Azul; Argentina
dc.description.fil
Fil: Simões, Marcello G.. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
dc.description.fil
Fil: Poiré, Daniel G.. 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.journal.title
Geological Magazine
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.cambridge.org/core/product/identifier/S0016756821000327/type/journal_article
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1017/S0016756821000327
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