Biostratigraphy of the Pliocene and Pleistocene from center-west of SanLuis, Argentina: Acta geológica lilloana 26 (1): 2014
This contribution reports sedimentological and paleobiological evidences fromthe upper Cenozoic outcrops in the south of Alto Pencoso (Occidental Ranges). They belongto: the Norwest Beazley, Desaguadero’s river valley and Salina del Bebedero basins. LasMulitas Formation crops out in Beazley (fluvial, Pliocene) and is characterized by the fossilsremains of Notoungulata y Dasypodidae, and is covered by Toro Muerto (alluvial, middle Pleis-tocene), Alto Grande (fluvial, late Pleistocene) and Barranquita (eolian, late Pleistocene) forma-tions. The latter with paleontological records assigned to Glyptodontidae and Macraucheniidae.At the river-bed of Jarilla stream crops out the Arco del Desaguadero Formation (fluvial, latePleistocene), where Chara contraria, C. cf. papillosa and C. hornemannii girogonites were rec-ognized. Likewise, in the foreshore deposits from Salina del Bebedero (fluvio-lacustrine, latePleistocene) Chilina mendozana, Heleobia parchappii, Biomphalaria peregrina and Sphaeriidaeshells were identified. The cretacic sedimentary rocks from the Occidental ranges were themain sedimentary source area during the Neogene, filling the tectonic depressions, with allu-vial plains and fluvial systems deposits that characterize the Beazley’s basin. Finally, the globalclimatic conditions related to the Last Glaciation in Los Andes range are represented by thefluvial sandy deposits of the Desaguadero’s river basin, the foreshore gravel sandy and cal-careous deposits from the Bebedero lake and the eolian sand and silt deposits that partiallycovers the surrounding plain
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Fundación Miguel Lillo
2014
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Font, Eimi Chiesa, Jorge Lucero, Natalia |
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Font, Eimi Chiesa, Jorge Lucero, Natalia Biostratigraphy of the Pliocene and Pleistocene from center-west of SanLuis, Argentina: Acta geológica lilloana 26 (1): 2014 |
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Font, Eimi Chiesa, Jorge Lucero, Natalia |
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Font, Eimi |
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Biostratigraphy of the Pliocene and Pleistocene from center-west of SanLuis, Argentina: Acta geológica lilloana 26 (1): 2014 |
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Biostratigraphy of the Pliocene and Pleistocene from center-west of SanLuis, Argentina: Acta geológica lilloana 26 (1): 2014 |
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Biostratigraphy of the Pliocene and Pleistocene from center-west of SanLuis, Argentina: Acta geológica lilloana 26 (1): 2014 |
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Biostratigraphy of the Pliocene and Pleistocene from center-west of SanLuis, Argentina: Acta geológica lilloana 26 (1): 2014 |
| title_full_unstemmed |
Biostratigraphy of the Pliocene and Pleistocene from center-west of SanLuis, Argentina: Acta geológica lilloana 26 (1): 2014 |
| title_sort |
biostratigraphy of the pliocene and pleistocene from center-west of sanluis, argentina: acta geológica lilloana 26 (1): 2014 |
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This contribution reports sedimentological and paleobiological evidences fromthe upper Cenozoic outcrops in the south of Alto Pencoso (Occidental Ranges). They belongto: the Norwest Beazley, Desaguadero’s river valley and Salina del Bebedero basins. LasMulitas Formation crops out in Beazley (fluvial, Pliocene) and is characterized by the fossilsremains of Notoungulata y Dasypodidae, and is covered by Toro Muerto (alluvial, middle Pleis-tocene), Alto Grande (fluvial, late Pleistocene) and Barranquita (eolian, late Pleistocene) forma-tions. The latter with paleontological records assigned to Glyptodontidae and Macraucheniidae.At the river-bed of Jarilla stream crops out the Arco del Desaguadero Formation (fluvial, latePleistocene), where Chara contraria, C. cf. papillosa and C. hornemannii girogonites were rec-ognized. Likewise, in the foreshore deposits from Salina del Bebedero (fluvio-lacustrine, latePleistocene) Chilina mendozana, Heleobia parchappii, Biomphalaria peregrina and Sphaeriidaeshells were identified. The cretacic sedimentary rocks from the Occidental ranges were themain sedimentary source area during the Neogene, filling the tectonic depressions, with allu-vial plains and fluvial systems deposits that characterize the Beazley’s basin. Finally, the globalclimatic conditions related to the Last Glaciation in Los Andes range are represented by thefluvial sandy deposits of the Desaguadero’s river basin, the foreshore gravel sandy and cal-careous deposits from the Bebedero lake and the eolian sand and silt deposits that partiallycovers the surrounding plain |
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Fundación Miguel Lillo |
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2014 |
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http://www.lillo.org.ar/journals/index.php/acta-geologica-lilloana/article/view/517 |
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rev-actageologica-ar-article-5172019-08-21T18:08:05Z Biostratigraphy of the Pliocene and Pleistocene from center-west of SanLuis, Argentina: Acta geológica lilloana 26 (1): 2014 Bioestratigrafía del Plioceno y Pleistoceno delcentro-oeste de San Luis, Argentina: Acta geológica lilloana 26 (1): 2014 Font, Eimi Chiesa, Jorge Lucero, Natalia Cenozoico superior bioestratigrafía cuenca Beazley río Desaguadero Salina del Bebedero Upper Cenozoic Biostratigraphy Beazley basin Desaguadero river Salina delBebedero This contribution reports sedimentological and paleobiological evidences fromthe upper Cenozoic outcrops in the south of Alto Pencoso (Occidental Ranges). They belongto: the Norwest Beazley, Desaguadero’s river valley and Salina del Bebedero basins. LasMulitas Formation crops out in Beazley (fluvial, Pliocene) and is characterized by the fossilsremains of Notoungulata y Dasypodidae, and is covered by Toro Muerto (alluvial, middle Pleis-tocene), Alto Grande (fluvial, late Pleistocene) and Barranquita (eolian, late Pleistocene) forma-tions. The latter with paleontological records assigned to Glyptodontidae and Macraucheniidae.At the river-bed of Jarilla stream crops out the Arco del Desaguadero Formation (fluvial, latePleistocene), where Chara contraria, C. cf. papillosa and C. hornemannii girogonites were rec-ognized. Likewise, in the foreshore deposits from Salina del Bebedero (fluvio-lacustrine, latePleistocene) Chilina mendozana, Heleobia parchappii, Biomphalaria peregrina and Sphaeriidaeshells were identified. The cretacic sedimentary rocks from the Occidental ranges were themain sedimentary source area during the Neogene, filling the tectonic depressions, with allu-vial plains and fluvial systems deposits that characterize the Beazley’s basin. Finally, the globalclimatic conditions related to the Last Glaciation in Los Andes range are represented by thefluvial sandy deposits of the Desaguadero’s river basin, the foreshore gravel sandy and cal-careous deposits from the Bebedero lake and the eolian sand and silt deposits that partiallycovers the surrounding plain Se presentan evidencias sedimentológicas y paleobiológicas del Cenozoico superioraflorantes al sur del Alto Pencoso (Serranías Occidentales), correspondientes a las cuencas:noroeste de Beazley, valle del río Desaguadero y Salina del Bebedero. En Beazley aflora laFormación Las Mulitas (fluvial, Plioceno), caracterizada por los restos fósiles de Notoungulatay Dasypodidae y cubierta por las formaciones Toro Muerto (aluvial, Pleistoceno medio), AltoGrande (fluvial, Pleistoceno tardío) y Barranquita (eólico, Pleistoceno tardío). Esta última conregistros paleontológicos asignados a Glyptodontidae y Macraucheniidae. En la base del arro-yo Jarilla aflora la Formación Arco del Desaguadero (fluvial, Pleistoceno tardío) en la que sereconocieron girogonitos de Chara contraria, C. cf. Papillosa y C. hornemannii. Asimismo, enlos depósitos costeros de la Salina del Bebedero (fluvio-lacustre, Pleistoceno tardío) se iden-tificaron las conchillas de Chilina mendozana, Heleobia parchappii, Biomphalaria peregrina ylas valvas de Sphaeriidae. Las sedimentitas cretácicas de las Serranías Occidentales fueronla principal área de aporte sedimentario durante el Neógeno, rellenando las depresiones tec-tónicas circundantes, con depósitos de planicies aluviales y sistemas fluviales que caracterizanla cuenca de Beazley. Finalmente, las condiciones climáticas globales vinculadas a la últimaglaciación en la región cordillerana andina, se manifiestan en los depósitos fluviales arenososde la cuenca del río Desaguadero, las gravas arenosas calcáreas costeras de la laguna delBebedero y las arenas y limos eólicos que cubren parcialmente la planicie circundante Fundación Miguel Lillo 2014-06-07 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artículo revisado por pares http://www.lillo.org.ar/journals/index.php/acta-geologica-lilloana/article/view/517 Acta Geológica Lilloana; Acta Geológica Lilloana 26 (1) (2014); 3-13 1852-6217 spa http://www.lillo.org.ar/journals/index.php/acta-geologica-lilloana/article/view/517/529 |