Ostracods and rock facies associated with the Devonian-Carboniferous boundary series in the Puech de la Suque section, Montagne Noire, France
Casier, J.-G.; Lethiers, F.; Préat, A. (2001). Ostracods and rock facies associated with the Devonian-Carboniferous boundary series in the Puech de la Suque section, Montagne Noire, France. Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 71: 31-52
In: Bulletin van het Koninklijk Belgisch Instituut voor Natuurwetenschappen. Aardwetenschappen = Bulletin de l'Institut Royal des Sciences Naturelles de Belgique. Sciences de la Terre. KBIN: Brussel. ISSN 0374-6291, more
|   |
| Keywords |
Geological time > Phanerozoic > Paleozoic > Palaeozoic > Carboniferous
Geological time > Phanerozoic > Paleozoic > Palaeozoic > Devonian > Devonian, Upper
Ostracoda [WoRMS]
France, Languedoc-Roussillon [Marine Regions]
Marine/Coastal |
| Author keywords |
Ostracods, Sedimentology, Devonian-Carboniferous boundary, Hangenberg Event, Montagne Noire |
| Authors | | Top |
- Casier, J.-G., more
- Lethiers, F.
- Préat, A., more
|
|
|
| Abstract |
4,750 ostracods valves and carapaces have been extracted from across the Devonian-Carboniferous boundary sequence in the Puech de la Suque section, Montagne Noire, southern France, and 72 species have been identified half of which belong to the Thuringian ecotype. The study revealed that a maximum of 31.5 percent of the species disappeared in this section as a result of the Hangenberg Event — a low rate of extinction compared to that generally associated worldwide with the Frasnian-Famennian boundary (75 %). The Hangenberg Event differs also from the Frasnian-Famennian boundary Event by the absence of ostracod "disaster species". The facies of the boundary series is relatively homogeneous and composed of grey to slightly pinkish and yellowish mudstones and wackestones with various bioclasts (ammonoids, trilobites, bivalves etc.), and radiolarian wackestones and packstones. Despite the difficulty to reconstruct a bathymetric profile, the inferred environment points to quiet and deeper water-conditions, below or near the storm wave base, and there is no evidence of turbidites and mudflows. The succession corresponds most likely to a distal carbonate ramp, its lower part being characterized by hemipelagic or pelagic sediments. The microfacies analysis shows that no significant paleo-environmental changes occurred at the Devonian-Carboniferous boundary.Two new species (Proparaparchites? procerus nov. sp. and Paraparchites puechdelasuquensis nov. sp.), and one new sub-species (Gerodia weyeri olempskae nov. subsp.) are established. |
|
