The Eocene flora of the Paris Basin: Contribution of fossil wood from Cuise-La-Motte (Oise) - Archive ouverte HAL
Communication Dans Un Congrès Année : 2024

The Eocene flora of the Paris Basin: Contribution of fossil wood from Cuise-La-Motte (Oise)

La flore Éocène du Bassin de Paris : contribution des bois fossiles de Cuise-La-Motte (Oise)

Résumé

Eocene macroflora from Paris Basin is known thanks to several deposits that have been partially studied mainly for taxonomical studies (e.g.,Icacinaceae, Menispermaceae): Le Quesnoy (MP7), Passy (MP8–9), Grès de Belleu (MP10) and Prémontré (MP10). For the moment, more attention has been paid to fruit and seed, although these deposits sometimes contain large quantities of fossil wood (i.e. Le Quesnoy). Other sites containing only fossil wood have been generally overlooked. This is the case of the historical stratotype of Cuisien (Upper Ypresian) at Cuise-La-Motte (Oise). This locality is particularly noteworthy for its great diversity of marine, brackish and freshwater molluscs. But the site also contains a large quantity of fossil wood, which has so far only been very partially studied. The Cuise-La-Motte site was first studied by P-H Fritel (1867–1927) in the 20th century. He highlighted the excellent state of preservation of the fossil wood and described four taxa belonging to Quercinium, Cupressinoxylon, Pitioxylon and Piceoxylon. Later, Koeniguer described two new specimens that he attributed to Taxodioxylon and Palmoxylon. The work of the AESSFG (Association for the Study and Protection of Fossil and Geological Sites) has revived the paleobotanical interest in the Cuise-La-Motte site. For several years now, members of this association have been collecting dozens of fragments of fossil wood. This new collection complements the collections already held at the MNHN in Paris (e.g., Fritel and Braillon collections). A study of all the samples from Cuise-La-Motte, from the historical collections and the new collection, revealed a much greater diversity than previously thought. Of the 70 specimens studied, 20 morphotaxons were identified. Half were conifers belonging to the Pinaceae, Cupressaceae and Podocarpaceae, while the others were broadleaved trees belonging in particular to the Combretaceae and Symplocaceae. This study adds to our understanding of the evolution of flora during the Ypresian.
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Dates et versions

hal-04598742 , version 1 (03-06-2024)

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  • HAL Id : hal-04598742 , version 1

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Anaïs Boura, Nicolas Gentis, Marin Gangneux, Camille Regnier, Gabriela Lo Bue, et al.. The Eocene flora of the Paris Basin: Contribution of fossil wood from Cuise-La-Motte (Oise). XV International Palynological Congress & XI International Organization of Palaeobotany Conference, May 2024, Prague, Czech Republic. ⟨hal-04598742⟩
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