The Upper Sinemurian ammonite succession in the Sierra Madre Oriental (Mexico)

Christian MEISTER, Joachim BLAU, Jean-Louis DOMMERGUES, Rudolf SCHLATTER, Reinhard SCHMIDT-EFFING

Abstract


In the Sierra Madre Oriental (Mexico), the biostratigraphic subdivision of the Upper Sinemurian can be refined. It has been possible to differentiate 11 horizons from the upper Obtusum Zone to the top of the Raricostatum Zone which are correlated with the NW European standard zonation. The index species of each horizon is figured.

Keywords


ammonites; Early Jurassic; Sinemurian; biostratigraphy; Mexico; Sierra Madre Oriental

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