Encontrados 5 documentos, a visualizar página 1 de 1
Sedimentation pelagique et encroûtements cryptalgaires: les calcaires gremeleux...
Elmi, S.; Rocha, R. B.; Mouterde, R.In Portugal, Carixian is generally represented by alternative layers of marly limestones characterized by nodule and lumpy levels. These layers are particularly developped [show preferential development] on passage areas to a sedimentary basin, particularly along the slope of tilted blocks between the Meseta and Berlenga's horst. This facies is included in the range of the «nodular limestone» and of the «ammoni...
Pliensbachian/Toarcian boundary: the proposed GSSP of Peniche (Portugal)
Elmi, S.The Peniche section (Portugal) is considered as a potential stratotype (GSSP) for the Pliensbachian/Toarcian boundary and it is analysed on the background of the available data on the ammonite successions from other Tethyan and NW European areas.
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...
Calcareous nannofossil assemblages across the Pliensbachian/Toarcian boundary a...
Mailliot, S.; Elmi, S.; Mattioli, E.; Pittet, B.The Peniche section has revealed moderately-to-well preserved calcareous nannofossil assemblages across the Pliensbachian/Toarcian boundary. This good record has allowed the proposition of a refined biostratigraphic scheme. The stage boundary, as defined by ammonites, is comprised within the NJ5b C. impontus (NW Europe; BOWN & COOPER, 1998) or the NJT5b L. sigillatus (Mediterranean Tethys; MATTIOLI & ERBA, 1999...
Une succession de référence pour le Toarcien Moyen et Supérieur: les "Margas ca...
Elmi, S.; Mouterde, R.; Rocha, R. B.; Rulleau, L.The geological sections studied at the São Gião sector (Cantanhede region) have allowed the establishment of a clear succession of ammonite associations during the Middle and Upper Toarcian (“Margas calcárias de São Gião” and “Calcários margosos de Póvoa da Lomba” Formations). The fossil collections were gathered over the last 40 years and, in spite of the apparent facies monotony, come from a thick and fossili...
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