Encontrados 4 documentos, a visualizar página 1 de 1
Stratigraphie du Dogger et crise lusitanienne dans la Serra de Candeeiros
Ruget, Ch.; Thierry, J.; Rocha, R. B.; Delance, J. H.; Laurin, B.; Mouterde, R.; Tintant, H.New elements about the stratigraphy of the Serra de Candeeiros Dogger and Lower «Lusitanian» are presented. The Lower Aalenian was recognized for the first time. Bathonian (more than 50 metres thick) is dated on brachiopods and foraminifera. It corresponds to a series of massive micritic, biodetritical, coral-reef, chaetetid, bryozoa and oolitic-limestones. Callovian (120 m) begins by whitish or yellowish limes...
Faciès, biostratigraphie et paléogéographie du Jurassique portugais
Mouterde, R.; Rocha, R. B.; Ruget, Ch.; Tintant, H.The facies distribution along the Jurassic stages in an already well established stratigraphic frame is defined for the three portuguese basins: North of Tagus, Santiago de Cacém and Algarve. The deposits are organized in two sedimentary cycles. The first one from the Liassic to Calovian shows, in the Tagus Basin, a transgression from NW which did not surpass the Meseta present limits. The iniatilly brackish de...
Particularités de la microfaune (Foraminifère) à la limite Carixien/Domérien de...
Ruget, Ch.The Middle Liassic outcrops of the Coimbra region (Portugal) show, at Carixian-Domerian boundary, an unusual high frequence of the Falsopalmula, morphogenus,that is generally well represented in the Lower Toarcian. The study of the Nodosaridea association shows that the massive presence of this morphogenus excludes the Lenticulina s. st. genus. These faunistic particularities should be ascribed to the environme...
Toarcian GSSP candidate: the Peniche section at Ponta do Trovão
Elmi, S.; Mouterde, R.; Rocha, R. B.; Ruget, Ch.The Peniche section (Ponta do Trovão) in Portugal is presented as potential stratotype (GSSP) for the Pliensbachian/Toarcian boundary. The lithostratigraphic succession is described and the chronostratigraphy, based on ammonite assemblages, is presented; the change in foraminifera assemblages occurs later, only at the base of beds 16 (base of Semicelatum Subzone, Crosbeyi ? Horizon). An extensive bibliographica...
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