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dc.contributor.authorMasilla, Héctor-
dc.contributor.authorLeppe, Marcelo-
dc.contributor.authorde Valais, Silvina-
dc.contributor.authorVarela, Natalia-
dc.date.accessioned2020-09-21T15:09:22Z-
dc.date.available2020-09-21T15:09:22Z-
dc.date.issued2010-
dc.identifier.urihttp://rid.unrn.edu.ar/handle/20.500.12049/5952-
dc.language.isoenes_ES
dc.relation.ispartof31° SCARes_ES
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/-
dc.titleNew avian tracks from King George Island, Antarcticaes_ES
dc.typeObjeto de conferenciaes_ES
dc.rights.licenseCreative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)-
dc.description.filiationMansilla, Héctor. Instituto Antártico Chileno. Laboratorio de Palaeobiología; Chile.es_ES
dc.description.filiationLeppe, Marcelo. Instituto Antártico Chileno. Laboratorio de Palaeobiología; Chile.es_ES
dc.description.filiationde Valais, Silvina. Universidad Nacional de Rio Negro. Instituto de Investigaciones en Paleobiologia y Geologia. Río Negro, Argentina.es_ES
dc.description.filiationVarela, Natalia. Earth Sciences Department, University of Concepción; Chile.es_ES
dc.subject.keywordVertebrate and Invertebrate Trace Fossilses_ES
dc.subject.keywordFossil Hill Formationes_ES
dc.subject.keywordMiddle Eocenees_ES
dc.subject.keywordKing George Islandes_ES
dc.subject.keywordAntarcticaes_ES
dc.type.versioninfo:eu-repo/semantics/publishedVersiones_ES
dc.subject.materiaCiencias Exactas y Naturaleses_ES
dc.origin.lugarDesarrolloUniversidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología.es_ES
dc.description.resumenTrace fossils are known to exist in the type locality of the Fossil Hill Formation (Middle Eocene) at Fossil Hill, King George Island, Antarctica, since at least four decades. However, during fieldwork in 2009, abundant new avian tracks and invertebrate traces have been recovered, which are analyzed here. Three avian ichnotaxa are distinguished in this study. The most common tracks are tridactyl or tetradactyl, with the slender digit II to IV imprints anteriorly directed and a posterior hallux impression, and are included in Gruipeda. The rest of the footprints have tentatively been assigned to Presbyoniformipes which includes four wide, short digit impressions with present of webbing mark, and to Avipeda, composed of a tetradactyl track with a prominent claw; both being documented in the locality for the first time. The invertebrate traces include simple structures, such as Helminthoidichnites and Skolithos, and at least an undetermined arthropod trace, composed of a slightly sinusoidal trail, characterized by oblique and parallel to irregular marks. Both invertebrate and avian traces are preserved in a volcaniclastistic sediment sequence intercalated with fine grained agglomerates. They support a lacustrine environment which seasonally dried and was episodically refilled. The trace fossil assemblage from Fossil Hill displays a typical Scoyenia ichnofacies setting, particularly of a shorebird ichnofacies. Further detailed studies of this site will be useful to the recognition of subdivisions of the Scoyenia ichnofacies and will allow us to reconstruct the paleocommunity and paleoenviroment during the Eocene in Antarctica.es_ES
dc.type.subtypeResumenes_ES
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