560 Paläontologie; Paläozoologie
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Clastic deposits related to alluvial and estuarine environments sedimented during the early Liassic in the Veillon area (south of Talmont-Saint-Hilaire, Vendée, France). A reptile fauna including various taxa, just known by innumerable footprints, lived in that environment, in rather hot and dry climatic conditions.
Recent extension works of the quarry of La Gouraudière in Mauzé-Thouarsais (in Deux-Sèvres), and excavation works for the water reservoirs to irrigate the cereal fields in Le Bernard (in Vendée) led to the collection of an interesting fauna of ammonites among which several species are close to the téthysian ones.
Comparaison des ichnopopulations des Grands Causses (Sud de la France) et du Veillon (Vendée)
(2003)
From descriptive statistic method concerning length (L), width (W) and L/W, it is suggested that Grallator variabilis samples from Vendée (Le Veillon) and Grands Causses belong to the same ichnospecies. Also, by this way, G. maximus of Hettangian of Vendée could be synonym of G. minusculus from USA Hettangian.
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.
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.
Analyse d'un exemple de fossilisation d'une trace de pas de Dinosaure (Lias inférieur des Causses)
(2003)
A calcareous block made of algo-laminated (stromatolitic) material exhibits at its upper surface a foot print of a Dinosaurian. A vertical section (sawing) and a thin section allow to make detailed observations. The early diagenesis permits the preservation of the deformations caused by the foot print.
In the inter/supratidal algal mats, the early diagenesis products a progressive induration. It is enough to preserve all the deformations affecting the mats, including footprints of vertebrates, tracks and burrows of small invertebrates, and physical actions (desiccation cracks).
Hettangian stratotype shows an example of preservation and valorisation of a scientifical historical place. Earth Story is understood thanks to geological heritage; this heritage is very vulnerable. Judicial framework and mentality evolution allow us to make a conservation of particularly interesting places.
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.
The Ichnospace is a specific exhibition dedicated to traces and tracks left by recent and fossil animals on ground. The Ichnospace is located at Luzech, a little town with a long historic past, near Cahors (about 17 km W) in the valley of the river Lot. Every living being leaves traces of its activities (habitat, locomotion, diet, etc.) in its environment. These traces are the signing of the individual and they may be preserved and fossilised in geological time. They provide information about biodiversity, the habits of individuals and their distribution in time and space. In the Causses of Quercy area very near of Luzech and well known by palaeontologists and geologists, many dinosaur and pterosaur tracks have been discovered. Some of them are exposed with various fossil invertebrates, turtles, crocodiles and so on, from upper Jurassic when the sea Tethys ran along shores of the large Central island. Movie and an audio-visual show complete the exhibited specimens with French and English comments.