Accueil

science action online

une proximité à distance

Vous êtes ici

Land and freshwater microflora in a sparnacian amber from the corbiere (south france) : first observations

Twitter icon
Facebook icon
Google icon
LinkedIn icon
Auteur: 
BRETON, Gérard; GAUTHIER, Céline; VIZCAINO, Daniel
Qualité de l'auteur: 
Museum d'histoire naturelle du Havre; Museum d'histoire naturelle du Havre; biologiste - Carcassone
Date de publication: 
1999
Description: 

Red amber was collected at the base of a transgressive deposition sequence of Sparnacian age, in the vicinity of Douzens (Aude, France). The peripheric layer of the amber fragments yields at least three morphological types of bacteria. filaments of fungi, several types of algae, spores (some of them seem to bear elaters). and Pinus-like pollen grains. Amongst the algae, some specimens are morphologically : very close to living Trentepohlia sp. filaments. Or to filaments evoking the Chaetophorale Chaetonemopsis sp; One unicellular alga or sporte type is very puzzling : it bears two flagellas with pseudofossils which look like unipennate mastigonemas.
All thse microfossils can be closely compared with whether terrestrial or freshwater living taxa : this is coherent with th taphonomy. The organisms living in freshwater or on the ground being embedded in the peripheric layer of amber. The amber has then been reworked in a marine or brakisch environnement where it was definitely deposited. The transport was short because :
1) some "tears" are entire though this amber is very britle
2) the thin peripheric layer (less than 0.5mm) was not eroded.

We have not yet found insecs. Tje absence of diatoms is an other striking feature, still unexprained.

Thème(s): 
  • Increase
  • Decrease
  • Normal

Current Size: 100%

newsletter

recevoir chaque mois notre newsletter

actualités

Nos activités
De nos jours les instruments embarqués à bord de satellites font des prouesses pour étudier l’impact des activités humaines sur l’air que nous...
Nos activités
Jeudi 28 septembre 2023 à 20h Intervenante : Marie-Pierre Halm, Responsable de l'unité littoral, Chercheur HDR en écotoxicologie, Ifremer Un...
Nos activités
Jeudi 26 juin 2023 à 20h00     Intervenant : François Jérôme, Directeur de recherche CNRS, Institut de Chimie des Milieux et Matériaux de Poitiers L’...