The Alleret maar (Massif Central, France): A new lacustrine sequence of the early Middle Pleistocene in western Europe |
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| Authors: | Jean-Fran ois Pastre, Agn s Gauthier, S bastien Nomade, Paul Orth, Ana Andrieu, Franck Goupille, Herv Guillou, St phane Kunesch, St phane Scaillet,Paul Randall Renne |
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| Affiliation: | aLaboratoire de géographie physique, UMR 8591 CNRS, 1, place Aristide-Briand, 92195 Meudon cedex, France;bLaboratoire des sciences du climat et de l’environnement, CEA/CNRS, avenue de la Terrasse, 91198 Gif-sur-Yvette cedex, France;cBerkeley geochronology center, 2455, Ridge road, Berkeley, CA 94709, USA |
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| Abstract: | The Alleret maar (Massif Central, France) provides a long lacustrine sequence (40.6 m) attributed to the early Middle Pleistocene. Sediment, pollen and diatoms analysis of its upper part (AL2 core, 14.6 m) indicates two temperate phases marked by high lake levels, forest development and vegetation expansion. They are separated by a cold period during which lake level drops, coarse sediment input increases and steppic and xerophilous plants develop. Pollen data suggests that this sequence belongs to the upper part of the Cromerian complex. These results are in agreement with the 557 ± 3 ka (±12 ka, including all errors) 40Ar/39Ar age obtained from an interbedded tephra layer emitted by the Mont-Dore/Sancy strato-volcano and establish that this sequence probably covers the MIS 15 substages. |
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| Keywords: | Lacustrine sedimentation Tephrochronology Early Middle Pleistocene Palynology Diatoms Massif Central FranceMots clé s: Sé dimentation lacustre Té phrochronologie Plé istocè ne moyen ancien Palynologie Diatomé es Massif Central France |
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