| mhorn | Дата: Friday, 05.07.2013, 23:51 | Сообщение # 1 |
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| Comas-Rengifo M.J., Duarte L.V., Goy A., Paredes R., Silva R.L. (2013) El Sinemuriense Superior (cronozonas Oxynotum y Raricostatum) en la región de S. Pedro de Moel (Cuenca Lusitánica, Portugal) // Comunicações Geológicas 100, Especial I, 15-19.
http://www.lneg.pt/downloa....rr3.pdf
The detailed study of the ammonite succession (more than 800 specimens) observed in two expanded sections (Polvoeira and Água de Madeiros), located in the S. Pedro de Moel area (Lusitanian Basin), has allowed characterizing the Oxynotum and Raricostatum chronozones of the Upper Sinemurian. The Oxynotum Chronozone (Oxynotum Subchronozone) is recognized by the occurrence of the genera Oxynoticeras, Bifericeras, Cheltonia and Plesechioceras and the Raricostatum Chronozone (Raricostatum, Macdonnelli y Aplanatum subchronozones) by the record of several typical taxa of the standard zonation, pertaining to the genera Echioceras, Leptechioceras, Paltechioceras gr. tardecrescens. Based on the occurrence of Gemmellaroceras (G. aff. aenigmaticum) and the first record of Apoderoceras subtriangulare, the Sinemurian-Pliensbachian boundary is formally defined for the first time in the Lusitanian Basin
Middle Jurassic - Lower Cretaceous ammonites & aptychi
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