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Communication Dans Un Congrès Année : 2016

A walk in the French Oligocene laurisilva (Appelle, Tarn, France)

Mélanie Tanrattana
  • Fonction : Auteur
Anais A Boura
Romain Thomas
  • Fonction : Auteur
  • PersonId : 953174

Résumé

More than 150 lignitized, fusinized and silicified fossil wood fragments were collected from 1999 to 2004 in the locality of Appelle (Tarn department, southwestern France). These plants remains were discovered together with vertebrate fossils. This deposit constitutes one of the rare areas of the Aquitaine Basin where macrofossil material is available. The outcrop is a small lens of sediment of Chattian (Oligocene) stage. About half of the wood specimens have already been prepared, examined and described. This first insight into this material reveals the presence of more than 10 xylotypes. Fossil wood samples were compared to extant and fossil taxa thanks to the insidewood database and to literature on tertiary material. This focus on past flora is in accordance with what previous studies show about this period. Arborescent diversity is composed for a great majority of taxa with nearest leaving relative inhabiting tropical or subtropical areas and for a minor part of temperate taxa. Only angiosperms were recorded and the absence of conifer is striking. Fossil wood are attributed to modern families, they belongs –among others- to Lauraceae, Oleaceae, Moraceae, Salicaceae. Arecaceae are also present (portion of stipe) as well as other Monocots preserved as small fragments. For their great majority these fossils belong to new species. A reconstruction of the forest ecosystems of Oligocene of France is proposed herein. Lauraceae is particularly well represented with at least 4 xylotypes. All the examined wood structure in the deposit show poorly marked growth ring limits. Therefore, this wood and stem assemblage suggests the existence of a sempervirent laurisilva forest.
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Dates et versions

hal-03618527 , version 1 (24-03-2022)

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  • HAL Id : hal-03618527 , version 1

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Mélanie Tanrattana, Anais A Boura, Dario De Franceschi, Romain Thomas. A walk in the French Oligocene laurisilva (Appelle, Tarn, France). 9th European Palaeobotany - Palynology Conference, Aug 2016, Padova, Italy. ⟨hal-03618527⟩
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