Sedimentological and malacological comparisons between the Upper Saalian and Upper Weichselian loess superimposed in the Nantois cliff (Brittany, France): Reconstruction of their environments south of the British Ice Sheet
International audience The site of Nantois is located in Brittany (France), almost at the westernmost end of Europe. The outcrop consists of loam, loess and slope deposits, now continuously eroded by the sea. The layers containing fragments of rock and loam are completely decalcified. Only the loess...
Published in: | ArchéoSciences |
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Main Authors: | , , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2017
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Online Access: | https://univ-rennes.hal.science/hal-01702305 https://doi.org/10.4000/archeosciences.5001 |
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ftunimainelemans:oai:HAL:hal-01702305v1 |
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openpolar |
institution |
Open Polar |
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Le Mans Université: Archives Ouvertes (HAL) |
op_collection_id |
ftunimainelemans |
language |
English |
topic |
Quaternary Nantois site loess molluscs stratigraphy granulometry palaeo-environment Quaternaire stratigraphie granulométrie mollusques site de Nantois paléoenvironnement [SHS]Humanities and Social Sciences [SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory |
spellingShingle |
Quaternary Nantois site loess molluscs stratigraphy granulometry palaeo-environment Quaternaire stratigraphie granulométrie mollusques site de Nantois paléoenvironnement [SHS]Humanities and Social Sciences [SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory Danukalova, Guzel Lefort, Jean-Pierre Monnier, Jean-Laurent Osipova, Eugenia Pustoc’h, François Le Bannier, Jean-Christophe Sedimentological and malacological comparisons between the Upper Saalian and Upper Weichselian loess superimposed in the Nantois cliff (Brittany, France): Reconstruction of their environments south of the British Ice Sheet |
topic_facet |
Quaternary Nantois site loess molluscs stratigraphy granulometry palaeo-environment Quaternaire stratigraphie granulométrie mollusques site de Nantois paléoenvironnement [SHS]Humanities and Social Sciences [SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory |
description |
International audience The site of Nantois is located in Brittany (France), almost at the westernmost end of Europe. The outcrop consists of loam, loess and slope deposits, now continuously eroded by the sea. The layers containing fragments of rock and loam are completely decalcified. Only the loess of the lower and upper parts of the section corresponding to the Nantois (Middle Pleistocene) and Sables-d’Or-Les-Pins (Late Pleistocene) formations are well preserved and display mollusc shells. A detailed study of the sediment and of the fauna permitted to better characterize the two loess. The older loess is characterized by a large variety of species. The analysis of their distribution indicates for the first time the existence of three moderate climatic improvements during the sedimentation. The lower part of the younger loess is poor in mollusc shells which are either absent or only exist as single finds or detritus, above, the molluscs composition indicates cold and severe climatic conditions during the sedimentation and can be correlated with the last glacial stage MIS 2. According to geochronological data, the upper part of the Nantois Formation corresponds to the glacial stage MIS 6. The origin of the discrepancies observed in the evolutions of the two loess was probably not related with the small difference in their distances respect with the Weichselian and Saalian British ice sheets but to the very different durations of the Upper Saalian (60 ka) and Upper Weischelian (7 ka) loess depositions. The absence of any significant warming episode during the Upper Weischelian and the existence of three climatic improvements during the Upper Saalian support the concept of sub-Milankovitch cycles which suggests that we cannot have any climatic change during a period shorter than 11Ka. Le site de Nantois est situé en Bretagne (France), presque à l’extrémité la plus orientale de l’Europe. L’affleurement est constitué de limons, de loess et de dépôts de pente maintenant régulièrement érodés par la mer. Les ... |
author2 |
Institute of Geology of the Ufimian Scientific Centre, Russian Academy of Sciences Centre de Recherche en Archéologie, Archéosciences, Histoire (CReAAH) Le Mans Université (UM)-Université de Rennes (UR)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Université de Nantes - UFR Histoire, Histoire de l'Art et Archéologie (UFR HHAA) Université de Nantes (UN)-Université de Nantes (UN)-Ministère de la Culture (MC) |
format |
Article in Journal/Newspaper |
author |
Danukalova, Guzel Lefort, Jean-Pierre Monnier, Jean-Laurent Osipova, Eugenia Pustoc’h, François Le Bannier, Jean-Christophe |
author_facet |
Danukalova, Guzel Lefort, Jean-Pierre Monnier, Jean-Laurent Osipova, Eugenia Pustoc’h, François Le Bannier, Jean-Christophe |
author_sort |
Danukalova, Guzel |
title |
Sedimentological and malacological comparisons between the Upper Saalian and Upper Weichselian loess superimposed in the Nantois cliff (Brittany, France): Reconstruction of their environments south of the British Ice Sheet |
title_short |
Sedimentological and malacological comparisons between the Upper Saalian and Upper Weichselian loess superimposed in the Nantois cliff (Brittany, France): Reconstruction of their environments south of the British Ice Sheet |
title_full |
Sedimentological and malacological comparisons between the Upper Saalian and Upper Weichselian loess superimposed in the Nantois cliff (Brittany, France): Reconstruction of their environments south of the British Ice Sheet |
title_fullStr |
Sedimentological and malacological comparisons between the Upper Saalian and Upper Weichselian loess superimposed in the Nantois cliff (Brittany, France): Reconstruction of their environments south of the British Ice Sheet |
title_full_unstemmed |
Sedimentological and malacological comparisons between the Upper Saalian and Upper Weichselian loess superimposed in the Nantois cliff (Brittany, France): Reconstruction of their environments south of the British Ice Sheet |
title_sort |
sedimentological and malacological comparisons between the upper saalian and upper weichselian loess superimposed in the nantois cliff (brittany, france): reconstruction of their environments south of the british ice sheet |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://univ-rennes.hal.science/hal-01702305 https://doi.org/10.4000/archeosciences.5001 |
long_lat |
ENVELOPE(-57.248,-57.248,51.483,51.483) |
geographic |
La Falaise |
geographic_facet |
La Falaise |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
ISSN: 1960-1360 EISSN: 2104-3728 Archeosciences, revue d'Archéométrie https://univ-rennes.hal.science/hal-01702305 Archeosciences, revue d'Archéométrie, 2017, 41 (2), pp.63-84. ⟨10.4000/archeosciences.5001⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.4000/archeosciences.5001 hal-01702305 https://univ-rennes.hal.science/hal-01702305 doi:10.4000/archeosciences.5001 |
op_doi |
https://doi.org/10.4000/archeosciences.5001 |
container_title |
ArchéoSciences |
container_issue |
41-2 |
container_start_page |
63 |
op_container_end_page |
84 |
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1790601690955644928 |
spelling |
ftunimainelemans:oai:HAL:hal-01702305v1 2024-02-11T10:04:56+01:00 Sedimentological and malacological comparisons between the Upper Saalian and Upper Weichselian loess superimposed in the Nantois cliff (Brittany, France): Reconstruction of their environments south of the British Ice Sheet Comparaison sédimentologique et malacologique entre les loess weichseliens et saaliens superposés dans la falaise de Nantois (Bretagne, France): Reconstruction de leurs environnements au sud de la calotte glaciaire britannique Danukalova, Guzel Lefort, Jean-Pierre Monnier, Jean-Laurent Osipova, Eugenia Pustoc’h, François Le Bannier, Jean-Christophe Institute of Geology of the Ufimian Scientific Centre, Russian Academy of Sciences Centre de Recherche en Archéologie, Archéosciences, Histoire (CReAAH) Le Mans Université (UM)-Université de Rennes (UR)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Université de Nantes - UFR Histoire, Histoire de l'Art et Archéologie (UFR HHAA) Université de Nantes (UN)-Université de Nantes (UN)-Ministère de la Culture (MC) 2017-12-08 https://univ-rennes.hal.science/hal-01702305 https://doi.org/10.4000/archeosciences.5001 en eng HAL CCSD G.M.P.C.A./Presses universitaires de Rennes info:eu-repo/semantics/altIdentifier/doi/10.4000/archeosciences.5001 hal-01702305 https://univ-rennes.hal.science/hal-01702305 doi:10.4000/archeosciences.5001 ISSN: 1960-1360 EISSN: 2104-3728 Archeosciences, revue d'Archéométrie https://univ-rennes.hal.science/hal-01702305 Archeosciences, revue d'Archéométrie, 2017, 41 (2), pp.63-84. ⟨10.4000/archeosciences.5001⟩ Quaternary Nantois site loess molluscs stratigraphy granulometry palaeo-environment Quaternaire stratigraphie granulométrie mollusques site de Nantois paléoenvironnement [SHS]Humanities and Social Sciences [SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory info:eu-repo/semantics/article Journal articles 2017 ftunimainelemans https://doi.org/10.4000/archeosciences.5001 2024-01-24T17:41:53Z International audience The site of Nantois is located in Brittany (France), almost at the westernmost end of Europe. The outcrop consists of loam, loess and slope deposits, now continuously eroded by the sea. The layers containing fragments of rock and loam are completely decalcified. Only the loess of the lower and upper parts of the section corresponding to the Nantois (Middle Pleistocene) and Sables-d’Or-Les-Pins (Late Pleistocene) formations are well preserved and display mollusc shells. A detailed study of the sediment and of the fauna permitted to better characterize the two loess. The older loess is characterized by a large variety of species. The analysis of their distribution indicates for the first time the existence of three moderate climatic improvements during the sedimentation. The lower part of the younger loess is poor in mollusc shells which are either absent or only exist as single finds or detritus, above, the molluscs composition indicates cold and severe climatic conditions during the sedimentation and can be correlated with the last glacial stage MIS 2. According to geochronological data, the upper part of the Nantois Formation corresponds to the glacial stage MIS 6. The origin of the discrepancies observed in the evolutions of the two loess was probably not related with the small difference in their distances respect with the Weichselian and Saalian British ice sheets but to the very different durations of the Upper Saalian (60 ka) and Upper Weischelian (7 ka) loess depositions. The absence of any significant warming episode during the Upper Weischelian and the existence of three climatic improvements during the Upper Saalian support the concept of sub-Milankovitch cycles which suggests that we cannot have any climatic change during a period shorter than 11Ka. Le site de Nantois est situé en Bretagne (France), presque à l’extrémité la plus orientale de l’Europe. L’affleurement est constitué de limons, de loess et de dépôts de pente maintenant régulièrement érodés par la mer. Les ... Article in Journal/Newspaper Ice Sheet Le Mans Université: Archives Ouvertes (HAL) La Falaise ENVELOPE(-57.248,-57.248,51.483,51.483) ArchéoSciences 41-2 63 84 |