The Alleret maar (Massif Central, France): A new lacustrine sequence of the early Middle Pleistocene in western Europe

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• 作者：Jean-Franç ; ois Pastre ; Agnè ; s Gauthier ; Sé ; bastien Nomade ; Paul Orth ; Ana Andrieu ; Franck Goupille ; Hervé ; Guillou ; Sté ; phane Kunesch ; Sté ; phane Scaillet ; Paul R ; all Renne
• 关键词：Lacustrine sedimentation ; Tephrochronology ; Early Middle Pleistocene ; Palynology ; Diatoms ; Massif Central ; France
  Mots clé ; s ; Sé ; dimentation lacustre ; Té ; phrochronologie ; Plé ; istocè ; ne moyen ancien ; Palynologie ; Dia
• 刊名：Comptes Rendus Geoscience
• 出版年：2007
• 出版时间：December 2007
• 年：2007
• 卷：339
• 期：16
• 页码：987-997
• 全文大小：642 K

文摘

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.