560 Paläontologie; Paläozoologie
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It has been forty years since the Jurassic site of Veillon in Talmont-Saint-Hilaire (Vendée, France), where footprints of vertebrates were found, was plundered. This outstanding site belonging to Vendée's geological patrimony needs to be preserved and developed. Some footprints from Veillon are displayed in the collections of about thirty public institutions and six museums.
Numerous footprints areas has been found, since 1962, in Permian, Triassic and Hettango-Sinemurian. All show precised oriented trackways. So that they were undestood like walking ways but their precise meaning is still enigmatic.
Using the fossil dinosaur footprints of the lower Lias of Le Veillon at Talmont-Saint-Hilaire, (Vendée) as a starting point, the reconstitution by pupils of a unique fossil-bearing site is under consideration. The paleobiology and paleoecology of reptiles in this geological site are dealt with.
Au Sahel du Burkina Faso, le diagramme pollinique d'Oursi fournit des évidences sur l'apparition de l'agriculture, il y a environ 3000 ans. A partir de ces faits, le but principal des recherches archéologiques dans le cadre du SFB 268 était de trouver et de fouiller des sites qui seraient à même d'apporter des informations sur cette période décisive autour de 3000 ans avant l'actuel. Pour cela, nous avons concentré notre travail sur les provinces du Séno et plus particulièrement de l'Oudalan. Le paysage de cette région est marqué par des dunes qui s'organisent grossièrement en cordons d'orientation nord-est/sud-ouest à travers notre terrain.
Palichnites et muséologie
(2003)
After they had intrigued the inquiring or observant mind for decades, it was realised that certain "natural curiosities" were tracks of extinct creatures, related to gigantic birds or other antediluvian animals. At the beginning of the XIXth century a new science, ichnology, came into being and developed, thanks to the collection, preservation and study of fossil prints. The increasing quantity of evidence thus unearthed reveals the diversity of vertebrate faunas which have trod the earth’s surface and left behind valuable information about their characteristics and behaviour. Like other institutions labouring on behalf of conservation, knowledge of nature and the preservation of our natural heritage, the Nantes Natural History Museum has, for nearly two centuries, collected, conserved, displayed and brought to the attention of the public those valuable pieces of evidence, fossil footprints. Displays of fossil prints are regularly presented during different exhibitions. Examples of them permit one to follow the evolution of our knowledge of these prints and illustrate how the information yielded by these prints has been transmitted.
Footprints are numerous in France where they found from Carboniferous to Quaternary levels. Those of Middle Triassic (Anisian-Ladinian) are especialy interesting because they are tridactyl footprints made probably by first dinosaurs. First skelettons are known from Upper Ladinian / lower Carnian.
The Liassic Talmont-Saint-Hilaire (Vendée, France) outcrop has been studied here according to the abundance of fossil plants of the Cheirolepidiaceous family (Gymnosperms, Coniferales). A new species of Brachyphyllum has been studied in light microscopy, even in scanning electron microscopy and transmission electron microscopy. It is, at that time, one of the most complete study realized on a fossil taxon. Epidermal cells, subsidiary cells and guard cells have been described on both adaxial and abaxial surfaces, in transversal and longitudinal sections. Cuticle ultrastructural variations have been observed between epidermal and stomatal cells. To conclude, we propose a discussion about the cuticle structure variations related to environmental conditions and the functional morphology of the different cells.
La métallurgie du fer jouit d'un regain d'intérêt en Afrique depuis une décénnie. Alors que les diffusionistes et les antidiffusionistes se sont affrontés dans les années 1970, on assiste aujourd'hui à une nouvelle fièvre du "fer" où les chercheurs, mettant de côté l'idéologie, travaillent avec acharnement sur les fourneaux de réduction et sur toutes les traces de cette métallurgie. Les résultats obtenus sont déja impressionnants. L'environnement constituent aussi, désormais, une préoccupation majeure des chercheurs. Les recherches en paléométallurgie au Burkina Faso n'échappent pas totalemennt à cette critique. C'est pour attirer plus d'attention sur l'important complément sociologique des investigations archéologiques que nous proposons en ces lignes les quelques informations relatives aux conditions sociales des forgerons, potiers et potières, réunis dans plusieurs nationalités du Burkina Faso par une sorte de communauté de destin: les arts du feu.