The lujanian legacy of ameghino: A stratigraphic revision of the pleistocene-holocene deposits of the río luján valley in its type section. The paleoclimatic record in the pampas from OIS 4 to OIS 1

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Between 1870 and 1884, Florentino Ameghino consecrated all his efforts to document and to prove the coexistence of man and Pampean megafauna in the Luján valley. He described several sites in channel and alluvial plain settings in valleys incised on Pampean loess. The geoarchaeological context of th...

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Autor principal: Toledo, M.J.
Formato: JOUR
Lenguaje:English; Spanish
Materias:
Ameghino
LGM
Lujanense
Mats blacks
OIS
Pampa
alluvial plain
archaeology
climate variation
extinction
Holocene
Last Glacial Maximum
luminescence dating
paleoclimate
Pleistocene
sequence stratigraphy
valley fill
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v68_n1_p121_Toledo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00044822_v68_n1_p121_Toledo2023-10-03T13:58:50Z The lujanian legacy of ameghino: A stratigraphic revision of the pleistocene-holocene deposits of the río luján valley in its type section. The paleoclimatic record in the pampas from OIS 4 to OIS 1 Toledo, M.J. Ameghino LGM Lujanense Mats blacks OIS Pampa alluvial plain archaeology climate variation extinction Holocene Last Glacial Maximum luminescence dating paleoclimate Pleistocene sequence stratigraphy valley fill Between 1870 and 1884, Florentino Ameghino consecrated all his efforts to document and to prove the coexistence of man and Pampean megafauna in the Luján valley. He described several sites in channel and alluvial plain settings in valleys incised on Pampean loess. The geoarchaeological context of these sites, characterized by the abundance of megafauna modified bones, were never studied again after the publication of La Antigüedad del Hombre en el Plata in 1880-81. Here we present a stratigraphical reevaluation and reinterpretation of his "Piso Lujanense" based on a sequence stratigraphy analysis and AMS, OSL and ESR dating. We conclude that the Pleistocene valley fill spans from OIS 4 to OIS 2 with sequence boundaries at 75, 55, 30, 17 and 13 ky BP, reflecting the OIS 4 to OIS 2 glacioeustatic falls in the pampas valleys. These deposits were sealed by a rich organic matter layer or black mats, indicating an abrupt climatic change with a dramatic increase of humidity starting sometime between 12.5 and 13 ky BP. The associated ecological changes probably triggered the extinction process. Fil:Toledo, M.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR English; Spanish info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v68_n1_p121_Toledo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language English; Spanish
orig_language_str_mv English; Spanish
topic Ameghino
LGM
Lujanense
Mats blacks
OIS
Pampa
alluvial plain
archaeology
climate variation
extinction
Holocene
Last Glacial Maximum
luminescence dating
paleoclimate
Pleistocene
sequence stratigraphy
valley fill
spellingShingle Ameghino
LGM
Lujanense
Mats blacks
OIS
Pampa
alluvial plain
archaeology
climate variation
extinction
Holocene
Last Glacial Maximum
luminescence dating
paleoclimate
Pleistocene
sequence stratigraphy
valley fill
Toledo, M.J.
The lujanian legacy of ameghino: A stratigraphic revision of the pleistocene-holocene deposits of the río luján valley in its type section. The paleoclimatic record in the pampas from OIS 4 to OIS 1
topic_facet Ameghino
LGM
Lujanense
Mats blacks
OIS
Pampa
alluvial plain
archaeology
climate variation
extinction
Holocene
Last Glacial Maximum
luminescence dating
paleoclimate
Pleistocene
sequence stratigraphy
valley fill
description Between 1870 and 1884, Florentino Ameghino consecrated all his efforts to document and to prove the coexistence of man and Pampean megafauna in the Luján valley. He described several sites in channel and alluvial plain settings in valleys incised on Pampean loess. The geoarchaeological context of these sites, characterized by the abundance of megafauna modified bones, were never studied again after the publication of La Antigüedad del Hombre en el Plata in 1880-81. Here we present a stratigraphical reevaluation and reinterpretation of his "Piso Lujanense" based on a sequence stratigraphy analysis and AMS, OSL and ESR dating. We conclude that the Pleistocene valley fill spans from OIS 4 to OIS 2 with sequence boundaries at 75, 55, 30, 17 and 13 ky BP, reflecting the OIS 4 to OIS 2 glacioeustatic falls in the pampas valleys. These deposits were sealed by a rich organic matter layer or black mats, indicating an abrupt climatic change with a dramatic increase of humidity starting sometime between 12.5 and 13 ky BP. The associated ecological changes probably triggered the extinction process.
format JOUR
author Toledo, M.J.
author_facet Toledo, M.J.
author_sort Toledo, M.J.
title The lujanian legacy of ameghino: A stratigraphic revision of the pleistocene-holocene deposits of the río luján valley in its type section. The paleoclimatic record in the pampas from OIS 4 to OIS 1
title_short The lujanian legacy of ameghino: A stratigraphic revision of the pleistocene-holocene deposits of the río luján valley in its type section. The paleoclimatic record in the pampas from OIS 4 to OIS 1
title_full The lujanian legacy of ameghino: A stratigraphic revision of the pleistocene-holocene deposits of the río luján valley in its type section. The paleoclimatic record in the pampas from OIS 4 to OIS 1
title_fullStr The lujanian legacy of ameghino: A stratigraphic revision of the pleistocene-holocene deposits of the río luján valley in its type section. The paleoclimatic record in the pampas from OIS 4 to OIS 1
title_full_unstemmed The lujanian legacy of ameghino: A stratigraphic revision of the pleistocene-holocene deposits of the río luján valley in its type section. The paleoclimatic record in the pampas from OIS 4 to OIS 1
title_sort lujanian legacy of ameghino: a stratigraphic revision of the pleistocene-holocene deposits of the río luján valley in its type section. the paleoclimatic record in the pampas from ois 4 to ois 1
url http://hdl.handle.net/20.500.12110/paper_00044822_v68_n1_p121_Toledo
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AT toledomj lujanianlegacyofameghinoastratigraphicrevisionofthepleistoceneholocenedepositsoftheriolujanvalleyinitstypesectionthepaleoclimaticrecordinthepampasfromois4toois1
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