| mhorn | Дата: Sunday, 07.07.2013, 22:13 | Сообщение # 1 |
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| Paredes R., Comas-Rengifo M. J., Duarte L.V. (2013) Moluscos bivalves da Formação de Água de Madeiros (Sinemuriano superior) da Bacia Lusitânica (Portugal) // Comunicações Geológicas, 100, Especial I, 21-27.
http://www.lneg.pt/downloa....lt3.pdf
The stratigraphic distribution of bivalve molluscs throughout the Água de Madeiros Formation (Upper Sinemurian–lowermost Pliensbachian) at the Lusitanian Basin is present here. The work was carried out on the sections of S. Pedro de Moel and Peniche. This high-resolution stratigraphic analysis is based on 180 sampled beds and 2691 bivalve specimens. This new collection allows a significant improvement (31%) of the number of taxa already known for the basin, during this interval. The occurrence of a faunal turnover that allowed the spanning of opportunistic species, here interpreted as representative of a pseudoplanktonic habitat, is also shown. This record is noted around the Oxynotum–Raricostatum chronozone transition and inferred to have resulted from depositional changes linked with dysoxic conditions near the water-substrate interface. The appearance of Pseudomytilodes and Oxytoma forms in the Lusitanian Basin seems to be the earliest in the NO European Lower Jurassic province
Middle Jurassic - Lower Cretaceous ammonites & aptychi
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