Trace fossils of the glacial to postglacial transition in the el imperial formation (Upper Carboniferous), San Rafael Basin, Argentina

This paper reports the first ichnologic investigation in the San Rafael Basin, carried out in the glacial to postglacial transition, recorded in the El Imperial Formation at the Rio Atuel canyon. Following previous published stratigraphic schemes, three units were recognized in the field, but the up...

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Autores principales: Pazos, P.J., Di Pasquo, M., Amenabar, C.R.
Formato: SER
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_1060071X_v88_n_p137_Pazos
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_1060071X_v88_n_p137_Pazos2023-10-03T16:01:06Z Trace fossils of the glacial to postglacial transition in the el imperial formation (Upper Carboniferous), San Rafael Basin, Argentina Pazos, P.J. Di Pasquo, M. Amenabar, C.R. This paper reports the first ichnologic investigation in the San Rafael Basin, carried out in the glacial to postglacial transition, recorded in the El Imperial Formation at the Rio Atuel canyon. Following previous published stratigraphic schemes, three units were recognized in the field, but the upper one is ichnologically sterile and not studied in this paper. The lower unit shows evidence of glacial influence but lacks marine indicators and was deposited in a shallow paleovalley. Almost exclusively, the ichnofossils include locomotion traces produced by arthropods (Diplichnites and Diplopodichnus) or molluscs (Archaeonassa). Palynomorphs are terrestrial and show evidence of intense transport and deterioration. The middle unit contains a more varied range of ethologic categories: pascichnia (e.g., Mermia, Gordia, Cochlichnus), repichnia (e.g., Paganzichnus, Diplopodichnus, Didymaulichnus, Diplichnites, Undichna), and fodinichnia (e.g., Treptichnus) documented in transgressive deposits that record the glacial retreat and early postglacial interval. Many previous detailed studies carried out in contemporary successions of the basins of western Argentina have been the object of intense debate about the marine or nonmarine nature of these successions. In the middle unit, ichnofossils occur together with palynomorphs that show degradation and pyritization and contain scarce acritarchs suggesting brackish-water rather than fresh-water conditions in a fjord depositional system. Copyright © 2007 SEPM (Society for Sedimentary Geology). Fil:Pazos, P.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Amenabar, C.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. SER info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_1060071X_v88_n_p137_Pazos
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description This paper reports the first ichnologic investigation in the San Rafael Basin, carried out in the glacial to postglacial transition, recorded in the El Imperial Formation at the Rio Atuel canyon. Following previous published stratigraphic schemes, three units were recognized in the field, but the upper one is ichnologically sterile and not studied in this paper. The lower unit shows evidence of glacial influence but lacks marine indicators and was deposited in a shallow paleovalley. Almost exclusively, the ichnofossils include locomotion traces produced by arthropods (Diplichnites and Diplopodichnus) or molluscs (Archaeonassa). Palynomorphs are terrestrial and show evidence of intense transport and deterioration. The middle unit contains a more varied range of ethologic categories: pascichnia (e.g., Mermia, Gordia, Cochlichnus), repichnia (e.g., Paganzichnus, Diplopodichnus, Didymaulichnus, Diplichnites, Undichna), and fodinichnia (e.g., Treptichnus) documented in transgressive deposits that record the glacial retreat and early postglacial interval. Many previous detailed studies carried out in contemporary successions of the basins of western Argentina have been the object of intense debate about the marine or nonmarine nature of these successions. In the middle unit, ichnofossils occur together with palynomorphs that show degradation and pyritization and contain scarce acritarchs suggesting brackish-water rather than fresh-water conditions in a fjord depositional system. Copyright © 2007 SEPM (Society for Sedimentary Geology).
format SER
author Pazos, P.J.
Di Pasquo, M.
Amenabar, C.R.
spellingShingle Pazos, P.J.
Di Pasquo, M.
Amenabar, C.R.
Trace fossils of the glacial to postglacial transition in the el imperial formation (Upper Carboniferous), San Rafael Basin, Argentina
author_facet Pazos, P.J.
Di Pasquo, M.
Amenabar, C.R.
author_sort Pazos, P.J.
title Trace fossils of the glacial to postglacial transition in the el imperial formation (Upper Carboniferous), San Rafael Basin, Argentina
title_short Trace fossils of the glacial to postglacial transition in the el imperial formation (Upper Carboniferous), San Rafael Basin, Argentina
title_full Trace fossils of the glacial to postglacial transition in the el imperial formation (Upper Carboniferous), San Rafael Basin, Argentina
title_fullStr Trace fossils of the glacial to postglacial transition in the el imperial formation (Upper Carboniferous), San Rafael Basin, Argentina
title_full_unstemmed Trace fossils of the glacial to postglacial transition in the el imperial formation (Upper Carboniferous), San Rafael Basin, Argentina
title_sort trace fossils of the glacial to postglacial transition in the el imperial formation (upper carboniferous), san rafael basin, argentina
url http://hdl.handle.net/20.500.12110/paper_1060071X_v88_n_p137_Pazos
work_keys_str_mv AT pazospj tracefossilsoftheglacialtopostglacialtransitionintheelimperialformationuppercarboniferoussanrafaelbasinargentina
AT dipasquom tracefossilsoftheglacialtopostglacialtransitionintheelimperialformationuppercarboniferoussanrafaelbasinargentina
AT amenabarcr tracefossilsoftheglacialtopostglacialtransitionintheelimperialformationuppercarboniferoussanrafaelbasinargentina
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