La faune danienne de Vigny (Val-d’Oise, France) : importance pour l’étude de la diversification des mollusques au début du Tertiaire

Comptes Rendus de l Académie des Sciences - Series IIA - Earth and Planetary Science 06/2000; 330(12):867-873. DOI: 10.1016/S1251-8050(00)00226-3

ABSTRACT The Danian fauna of mollusca from Vigny increases from 55 to 171 species distributed in 130 genera. Extended stratigraphic ranges are given for 22 genera. The Cenozoic character of the fauna relies on the 57 exclusively Tertiary genera as opposed to only 9 genera of Maastrichtian and Danian distribution, and by a species assemblage closely similar to that of the Belgian Middle Danian.


Available from: Didier Merle, Jan 12, 2014
  • [Show abstract] [Hide abstract]
    ABSTRACT: This catalogue of 194 gastropod taxa is based on the collection of Danian gastropods from the Baunekule facies, Faxe Formation in eastern denmark. The gastropod fauna is extremely rich and well preserved. Most of the gastropods (106 species) are referred to genus level only, 9 morphotypes to even higher taxonomical levels and 79 gastropods are referred to species level. The gastropods are classified following Bouchet & Rocroi (2005) as 4 different clades: Vetigastropoda (represented by 26 species and 10 superfamilies); Caenogastropoda (represented by 142 species and 17 superfamilies); Heterobranchia (represented by 23 species and 5 superfamilies) and Opisthobranchia (represented by 1 species and 1 superfamily). The new species Zaclys? nuetzeli n. sp. is introduced. The Faxe Formation is recognized as a cold-water coral ecosystem with interfingering smaller bryozoan mounds. The Baunekule facies is found in the upper part of the coral mound complex of the Faxe Formation, where it forms isolated lensoidal bodies in the flanks of some of the coral mounds. It is characterized by a high diversity invertebrate fauna that occurs in weakly consolidated coral-dominated floatstone to rudstone. The diagenesis of the Baunekule facies is of special significance because a high proportion of the originally aragonite-shelled fauna is preserved by recrystallization to calcite during early burial diagenesis. Most of the gastropods are not known from other parts of the Faxe Fm. The fauna is very important for evolutionary comparative studies of the fossil and modern gastropods on cold-water coral mounds. Many of the genera have not previously been recorded from Danian strata. None of the gastropod species found in the Baunekule facies are known for certain to have passed the K/Pg boundary. The fauna is comparable to gastropods found on modern cold-water coral mounds in the North Atlantic. The gastropod fauna from Baunekule facies is characterized by a very high diversity of rather small millimeter sized gastropods having a preference for hard substrates; more than 63.9% belonging to the browsing carnivore trophic group, feeding mainly on sedentary animals. Surprisingly, the fauna contains some common occurrence of typically warm water species. The fauna consists mostly of Cenozoic genera and up to 87% of the species could be endemic to the cold-water coral ecosystem of the Faxe Fm. The diverse and rather unusual gastropod fauna from Baunekule facies is undoubtly linked to the evolution of cold-water coral ecosystems. It is now possible to download a pdf of the book from:
    Geological Survey of Denmark and Greenland Bulletin 12/2014; Geological Survey of Denmark and Greenland, Danish ministry of climate, energy and building., ISBN: 978-87-7871-391-9
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Decapod crustaceans inhabited a variety of environments during the Cretacous. The crab Caloxanthus is an example of this environmental differentiation as the Cretaceous-Danian species lived in siliciclastic and carbonate habitats. Here, two new species of Caloxanthus are described from different sedimentary settings: 1) Caloxanthus thompsonorum sp. nov. from the Upper Cretaceous (Santonian) of Austria found in siliciclastic sediments, and 2) Caloxanthus vignyensis sp. nov. from the Paleocene (Danian) of France found in a limestone. After examination of the marly rock containing the holotype of C. wrighti (Santonian, France), another conspecific carapace specimen was discovered; both specimens are illustrated. Caloxanthus is a prime example of how the appearance of decapod carapaces can differ among conspecific specimens with the cuticle preserved and those lacking it (internal molds). This phenomenon is also found in other decapod taxa as illustrated herein (Daira speciosa, Panopeus wronai and Chlorodiella mediterranea) and affects carapaces and chelae. Importantly, although this is known among paleontol-ogists, in only about half (50/108, 46%) of the in 2013 newly described fossil decapod species it could be deduced with certainty whether or not a cuticle was present. Even more surprising, in only 27% of the cases the presence or absence of the cuticle was specifically mentioned. It is recommended to state whether or not the cuticle is preserved in the species description to reduce the potential of misidentification of taxa and erecting erroneous taxa. We also show that whitening of specimens to increase contrast may also obscure features on the carapace of C. wrighti. This study highlights the effect that taphonomy can have on taxonomy.
    Cretaceous Research 03/2015; 55:141-151. DOI:10.1016/j.cretres.2014.11.011 · 2.39 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Berthella arctata nov. sp. and Berthella pristina nov. sp. are described from Danian (Paleocene) of Vigny (Val d’Oise, France) and Berthella jodiae nov. sp. is described from Marinesian (Bartonian, Middle Eocene) of Le Quoniam, Haravilliers (Val d’Oise, France). No species of the genus Berthella de Blainville, 1824 is known from paleogene fauna of the Paris Basin, whereas one species is known from the Chattian (Upper Oligocene) of Aquitaine Basin. Very little, mostly questionable information is known on fossil species of the genus. The present report at Danian is the first unequivocal fossil record of Berthella, allowing the stratigraphic and biogeographic range of the genus to be extended to the Paleocene.