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dc.contributor.authorSimoes, M. G.
dc.contributor.authorKowalewski, M.
dc.date.accessioned2014-02-26T17:12:26Z
dc.date.accessioned2014-05-20T13:57:52Z
dc.date.available2014-02-26T17:12:26Z
dc.date.available2014-05-20T13:57:52Z
dc.date.issued1998-01-01
dc.identifierhttp://dx.doi.org/10.1007/BF02537364
dc.identifier.citationFacies. Erlangen: Institut Palaontologie Universitat Erlangen-nurnberg, v. 38, p. 175-195, 1998.
dc.identifier.issn0172-9179
dc.identifier.urihttp://hdl.handle.net/11449/20610
dc.description.abstractMicrostratigraphic, sedimentological, and taphonomic features of the Ferraz Shell Bed, from the Upper Permian (Kazanian-Tatarian?) Corumbatai Formation of Rio Claro Region (the Parana Basin, Brazil), indicate that the bed consists of four distinct microstratigraphic units. They include, from bottom to top, a lag concentration (Unit 1), a partly reworked storm deposit (Unit 2), a rapidly deposited sandstone unit with three thin horizons recording episodes of reworking (Unit 3), and a shell-rich horizon generated by reworking/winnowing that was subsequently buried by storm-induced obrution deposit (Unit 4). The bioclasts of the Ferraz Shell Bed represent exclusively bivalve mollusks. Pinzonella illusa and Terraia aequilateralis are the dominant species. Taphonomic analysis indicates that mollusks are heavily time-averaged (except for some parts of Unit 3). Moreover, different species are time-averaged to a different degree (disharmonious time-averaging). The units differ statistically from one another in their taxonomic and ecological composition, in their taphonomic pattern, and in the size-frequency distributions of the two most common species. Other Permian shell beds of the Parana Basin are similar to the Ferraz Shell Bed in their faunal composition (they typically contain similar sets of 5 to 10 bivalve species) and in their taphonomic, sedimentologic, and microstratigraphic characteristics. However, rare shell beds that include 2-3 species only and are dominated by articulated shells preserved in life position also occur. Diversity levels in the Permian benthic associations of the Parana Basin were very low, with the point diversity of 2-3 species and with the within-habitat and basin-wide (alpha and gamma) diversities of 10 species, at most. The Parana Basin benthic communities may have thus been analogous to low-diversity bivalve-dominated associations of the present-day Baltic Sea. The 'Ferraz-type' shell beds of the Parana Basin represent genetically complex and highly heterogeneous sources of paleontological data. They are cumulative records of spectra of benthic ecosystems time-averaged over long periods of time (10(2)-10(4) years judging from actualistic research). Detailed biostratinomic reconstructions of shell beds can not only offer useful insights into their depositional histories, but may also allow paleoecologists to optimize their sampling designs, and consequently, refine paleoecological and paleoenvironmental interpretations.en
dc.format.extent175-195
dc.language.isoeng
dc.publisherInstitut Palaontologie Universitat Erlangen-nurnberg
dc.relation.ispartofFacies
dc.sourceWeb of Science
dc.subjectshell bedspt
dc.subjectmarine benthic paleoecologypt
dc.subjecttime-averagingpt
dc.subjecttaphonomypt
dc.subjectbivalvia(mollusca)pt
dc.subjectParana Basin (Brazil)pt
dc.subjectPermianpt
dc.titleShell beds as paleoecological puzzles: A case study from the Upper Permian of the Parana Basin, Brazilen
dc.typeArtigo
dcterms.licensehttp://www.springer.com/open+access/authors+rights
dcterms.rightsHolderInstitut Palaontologie Universitat Erlangen-nurnberg
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionPolish Acad Sci
dc.description.affiliationUniv Estadual Paulista, Inst Biociencias, BR-18618000 Botucatu, SP, Brazil
dc.description.affiliationPolish Acad Sci, Inst Paleobiol, PL-00818 Warszawa, Poland
dc.description.affiliationUnespUniv Estadual Paulista, Inst Biociencias, BR-18618000 Botucatu, SP, Brazil
dc.identifier.doi10.1007/BF02537364
dc.identifier.wosWOS:000073749100007
dc.rights.accessRightsAcesso restrito
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Botucatupt
unesp.author.orcid0000-0002-8575-4711[2]
unesp.author.orcid0000-0002-8706-3199[1]
dc.relation.ispartofjcr1.367
dc.relation.ispartofsjr0,669
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