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Christian Chaix et Bruno Cahuzac 《Eclogae Geologicae Helvetiae》2005,98(2):169-187
Resume. Historiquement, le genre Culicia (Anthozoaire Scléractiniaire) n’était connu, jusqu’à Chevalier (1961), qu’à partir du Burdigalien de Basse-Provence (France).
L’examen de récoltes récentes en Aquitaine et de diverses collections montre que l’espèce Culicia parasita (MICHELIN 1847) existe en fait dans cette région depuis l’Oligocène (Chattien), ce qui représente une notable extension de l’éventail
stratigraphique du genre. Cette espèce est largement illustrée ici, à partir de spécimens de chaque étage où elle a été reconnue,
et des données paléoécologiques sont fournies. Par ailleurs, grace à une révision bibliographique la plus complète possible
des références concernant le genre Culicia, et à de nouvelles récoltes effectuées dans le Néogène de l’ouest de la France et de Méditerranée, le hiatus stratigraphique
existant dans sa répartition entre le Miocène moyen d’Atlantique–Est et le Pliocène–Quaternaire d’Australie est désormais
comblé en grande partie. La question des relations phylétiques possibles entre les espèces fossiles et actuelles de Culicia est posée. Une carte de migration biogéographique est proposée, incluant tous les taxons du genre.
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The ‘Calcaires à Productus’ of the Montagne Noire are microbial build-ups. Two formations are defined and dated respectively as Uppermost Visean (Upper Warnantian–Brigantian) and Serpukhovian on the basis on corals. That makes these limestones out to be younger than previously stated (Lower and base of Upper Warnantian–Asbian and base of Brigantian) and indicates that the development of the olistoliths and thrusts including them, due to the Variscan orogeny, was at least as young as the Upper Serpukhovian. The Serpukhovian limestones of the Montagne Noire are correlated with the Lanet Limestone (Mouthoumet Massif, Corbières) and Ardengost Limestone (central Pyrenees). To cite this article: É. Poty et al., C. R. Geoscience 334 (2002) 843–848. 相似文献
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Abstract Deposits of 10 volcanic events of 6 stages have been discovered by the authors after detailed field and lab studies of the Benxi and Taiyuan Formations in Shandong Province and its adjacent regions. They show certain temporal–spatial distribution characteristics. Volcanic fragments were probably derived from two different volcanic sources north and south of the North China Platform, while the magma of the two volcanic sources was probably derived from the lower crust. A new stratigraphie correlation scheme is put forward for the Benxi and Taiyuan Formations in this region on the basis of previous biostratigraphic work with the regionally widespread volcanic event layers as the marker bed for the isochronous stratigraphie correlation on a super–regional scale and in conjunction with the maximum transgressive event layers. 相似文献
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New data about the ‘Sables fauves’ clearly show two different kinds of organisations: stratigraphic superposition of Langhian and Serravallian units to the south and embankment of Serravallian sediments in Langhian deposits to the north. The result consists in two different palaeogeographic schemes. The Langhian Sea is widely extended, forming the ‘Lectoure Gulf’, whereas the Serravallian Sea is much more reduced, with valleys fillings to the north and a little gulf to the south. This involves a tectonic activity along a structure which orientation is N120°E (‘flexure de la Douze’) and a relative rising of the northern part, of about 30 m. To cite this article: P. Gardère et al., C. R. Geoscience 334 (2002) 987–994. 相似文献
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Hervé Gillet Gilles Lericolais Jean-Pierre Rehault Corneliu Dinu 《Comptes Rendus Geoscience》2003,335(12):907-916
The stratigraphy of the Black Sea western margin is revisited through seismic data acquired during two French-Romanian surveys. These data are calibrated by industrial and DSDP drillings; they display several major discontinuities regarded as Tertiary erosional surfaces. The major seismic discontinuity underlines the base of Miocene formations and corresponds to a composite surface including at least three erosional phases ranging from Oligocene to Pontian times. Moreover, a Messinian erosional surface is clearly identified. This is in agreement with the Hsü's proposition [Palaeogeogr. Palaeoclimatol. Palaeoecol. 29 (1979) 75–93] suggesting a Messinian sea-level drop of Black Sea related to the Messinian Salinity Crisis described in the Mediterranean Sea. To cite this article: H. Gillet et al., C. R. Geoscience 335 (2003). 相似文献
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