Shell beds from the Low Head Member (Polonez Cove Formation, early Oligocene) at King George Island, west Antarctica: new insights on facies analysis, taphonomy and environmental significance

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dc.contributor.authorQuaglio, Fernanda
dc.contributor.authorWarren, Lucas Verissimo [UNESP]
dc.contributor.authorAnelli, Luiz Eduardo
dc.contributor.authorDos Santos, Paulo Roberto
dc.contributor.authorRocha-Campos, Antonio Carlos
dc.contributor.authorGazdzicki, Andrzej
dc.contributor.authorStrikis, Pedro Carlos
dc.contributor.authorGhilardi, Renato Pirani [UNESP]
dc.contributor.authorTiossi, Andressa Barraviera [UNESP]
dc.contributor.authorSimoes, Marcello Guimaraes [UNESP]
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionInst Paleobiol PAN
dc.date.accessioned2015-03-18T15:54:13Z
dc.date.available2015-03-18T15:54:13Z
dc.date.issued2014-08-01
dc.description.abstractShell bed levels in the Low Head Member of the early Oligocene Polonez Cove Formation at King George Island, West Antarctica, are re-interpreted based on sedimentological and taphonomic data. The highly fossiliferous Polonez Cove Formation is characterized by basal coastal marine sandstones, overlain by conglomerates and breccias deposited in fan-delta systems. The shell beds are mainly composed of pectinid bivalve shells of Leoclunipecten gazdzickii and occur in the basal portion of the Low Head Member. Three main episodes of bioclastic deposition are recorded. Although these shell beds were previously interpreted as shelly tempestites, we present an alternative explanation: the low fragmentation rates and low size sorting of the bioclasts resulted from winnowing due to tidal currents (background or diurnal condition) in the original bivalve habitat. The final deposition (episodic condition) was associated with subaqueous gravity driven flows. This new interpretation fits with the scenario of a prograding fan-delta front, which transported shell accumulations for short distances near the depositional site, possibly between fair-weather and storm wave bases. This work raises the notion that not every shell bed with similar sedimentological and taphonomic features (such as geometry, basal contact, degree of packing and shell orientation in the matrix) is made in the same way.en
dc.description.affiliationUniv Sao Paulo, Inst Geociencias, BR-05508080 Sao Paulo, Brazil
dc.description.affiliationUniv Estadual Paulista, Inst Geociencias & Ciencias Exatas, BR-13506900 Rio Claro, SP, Brazil
dc.description.affiliationInst Paleobiol PAN, PL-00818 Warsaw, Poland
dc.description.affiliationUniv Estadual Paulista, Fac Ciencias Bauru, Dept Ciencias Biol, BR-17033360 Sao Paulo, Brazil
dc.description.affiliationUniv Estadual Paulista, Inst Biociencias, Dept Zool, BR-18618000 Sao Paulo, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Geociencias & Ciencias Exatas, BR-13506900 Rio Claro, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Fac Ciencias Bauru, Dept Ciencias Biol, BR-17033360 Sao Paulo, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Biociencias, Dept Zool, BR-18618000 Sao Paulo, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdFAPESP: 10/19584-4
dc.description.sponsorshipIdCNPq: 550352/02-3
dc.format.extent400-412
dc.identifierhttp://dx.doi.org/10.1017/S0954102013000783
dc.identifier.citationAntarctic Science. New York: Cambridge Univ Press, v. 26, n. 4, p. 400-412, 2014.
dc.identifier.doi10.1017/S0954102013000783
dc.identifier.issn0954-1020
dc.identifier.lattes1333845337012256
dc.identifier.lattes3868502906886933
dc.identifier.orcid0000-0003-0410-8011
dc.identifier.urihttp://hdl.handle.net/11449/116822
dc.identifier.wosWOS:000339377300011
dc.language.isoeng
dc.publisherCambridge Univ Press
dc.relation.ispartofAntarctic Science
dc.relation.ispartofjcr1.394
dc.relation.ispartofsjr0,643
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectAntarctic coquinaen
dc.subjectLeoclunipectenen
dc.subjectpecten conglomerateen
dc.subjectpectinidsen
dc.subjectsedimentologyen
dc.subjectshell-bed genesisen
dc.titleShell beds from the Low Head Member (Polonez Cove Formation, early Oligocene) at King George Island, west Antarctica: new insights on facies analysis, taphonomy and environmental significanceen
dc.typeArtigo
dcterms.licensehttp://journals.cambridge.org/action/displaySpecialPage?pageId=4676
dcterms.rightsHolderCambridge Univ Press
unesp.author.lattes1333845337012256
unesp.author.lattes3868502906886933[8]
unesp.author.orcid0000-0003-0410-8011[8]
unesp.author.orcid0000-0002-8706-3199[10]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Botucatupt
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências, Baurupt
unesp.departmentCiências Biológicas - FCpt

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Bauru - FC - Faculdade de Ciências
Artigos - Zoologia - IBB