UPPER KIMMERIDGIAN AND TITHONIAN AMMONITES FROM THE TUNISIAN 'DORSALE' (NE TUNISIA): UPDATED BIOSTRATIGRAPHY FROM THE JEBEL OUST

摘要

In the context of updating biostratigraphic analysis in the Upper Kirnmcridgian-lowcrmost Berriasian from the whole of the Tunisian Dorsale (NE Tunisia), new results obtained from the Jebel Oust reference section are presented. The bed-by-bcd-sampling of a rather rich ammonite fauna gathered in the two most favourable profiles in the area allowed to propose, for the first time, a biozonation for Upper Kimmcridgian toTithonian limestones. Calpionellids relayed or completed ammonite assemblages, and were also useful for biostratigraphy in beds close to the Jurassic-Cretaceous boundary. The composition of ammonite assemblages, as well as the known ranges for genera and species, is in accordance with the available information from epio-ceanic areas in West-Mediterranean Tethys. The recognized biozones fit the standard proposal given by Groupc Francais D'Etude du Jur-assique in 1997. Age-interpretation for turbiditic horizons in the Jebel Oust is made for the first time. In spite of some limitations, the biostratigraphic results obtained in Jebel Oust sections provide a valuable tool for potential correlations with poorly known sections in northern Tunisia, as well as with other Tethyan areas.