Permian non-marine bivalves of the Falkland Islands and their palaeoenvironmental significance

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dc.contributor.authorSimoes, Marcello G. [UNESP]
dc.contributor.authorQuaglio, Fernanda
dc.contributor.authorWarren, Lucas V.
dc.contributor.authorAnelli, Luiz E.
dc.contributor.authorStone, Philip
dc.contributor.authorRiccomini, Claudio
dc.contributor.authorGrohmann, Carlos H.
dc.contributor.authorChamani, Marlei A. C.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionBritish Geol Survey
dc.date.accessioned2014-05-20T13:53:37Z
dc.date.available2014-05-20T13:53:37Z
dc.date.issued2012-12-01
dc.description.abstractWe describe the occurrence of non-marine bivalves in exposures of the Middle Permian (Capitanian) Brenton Loch Formation on the southern shore of Choiseul Sound, East Falklands. The bivalves are associated with ichnofossils and were collected from a bed in the upper part of the formation, within a 25 cm thick interval of dark siltstones and mudstones with planar lamination, overlain by massive sandstones. The shells are articulated, with the valves either splayed open or closed. At the top of the succession, mudstone beds nearly 1.5 m above the bivalve-bearing layers yielded well-preserved Glossopteris sp. cf. G. communis leaf fossils. The closed articulated condition of some shells indicates preservation under high sedimentation rates with low residence time of bioclasts at the sediment/water interface. However, the presence of specimens with splayed shells is usually correlated to the slow decay of the shell ligament in oxygen-deficient bottom waters. The presence of complete carbonized leaves of Glossopteris associated with the bivalve-bearing levels also suggests a possibly dysoxic-anoxic bottom environment. Overall, our data suggest that the bivalves were preserved by abrupt burial, possibly by distal sediment flows into a Brenton Loch lake, and may represent autochthonous to parautochthonous fossil accumulations. The shells resemble those of anthracosiids and are herein assigned to Palaeanodonta sp. aff. P. dubia, a species also found in the Permian succession of the Karoo Basin, South Africa. Our results confirm that (a) the true distributions in space and time of all Permian non-marine (freshwater) bivalves are not yet well known, and (b) there is no evidence for marine conditions in the upper part of the Brenton Loch Formation.en
dc.description.affiliationUniv Estadual Paulista, Inst Biociencias, BR-18610000 Botucatu, SP, Brazil
dc.description.affiliationUniv São Paulo, Inst Geociencias, Programas Grad Geoquim & Geotecton, BR-05508080 São Paulo, Brazil
dc.description.affiliationBritish Geol Survey, Edinburgh EH9 3LA, Midlothian, Scotland
dc.description.affiliationUnespUniv Estadual Paulista, Inst Biociencias, BR-18610000 Botucatu, SP, 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.format.extent543-554
dc.identifierhttp://dx.doi.org/10.1080/03115518.2012.688682
dc.identifier.citationAlcheringa. Abingdon: Taylor & Francis Ltd, v. 36, n. 4, p. 543-554, 2012.
dc.identifier.doi10.1080/03115518.2012.688682
dc.identifier.issn0311-5518
dc.identifier.urihttp://hdl.handle.net/11449/19137
dc.identifier.wosWOS:000311940000011
dc.language.isoeng
dc.publisherTaylor & Francis Ltd
dc.relation.ispartofAlcheringa
dc.relation.ispartofjcr1.033
dc.relation.ispartofsjr0,496
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectBivalviaen
dc.subjectAnthracosiidaeen
dc.subjectPermianen
dc.subjectnon-marineen
dc.subjectBrenton Loch Formationen
dc.subjectFalkland Islandsen
dc.subjectGondwanaen
dc.titlePermian non-marine bivalves of the Falkland Islands and their palaeoenvironmental significanceen
dc.typeArtigo
dcterms.licensehttp://journalauthors.tandf.co.uk/permissions/reusingOwnWork.asp
dcterms.rightsHolderTaylor & Francis Ltd
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Botucatupt
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claropt

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