Endémisme et cosmopolitisme des faunes d'ammonites de la plaque arabique au Crétacé moyen (Aptien - Turonien)

Luc Bulot (1)

1 FRE 2761 - Géologie des Systèmes Carbonatés

This paper is a first approach to the distribution through space and time of the mid-Cretaceous ammonite faunas of the Arabian plate. It is based on new collections made in Iran (Lurestan, Khuzestan and the coastal Fars area) and data from the literature (Oman, Lebanon, Jordan, Israel and Egypt). On the Arabian plate itself there is a marked difference between the diversity and abundance of the taxa present in intra-shelf basins from those on drowned platforms. Their comparison with faunas from Maghreb (Tunisia and Algeria mainly) enhances the validity of a premise concerning the existence of a South Tethyan endemic region that is well expressed during the Lower and Middle Albian, for it is marked by the success of highly distinctive faunas of Engonoceratidae ("Platiknemiceras", Knemiceras and Parengonoceras) developed on drowned platforms. This endemism is less obvious during the remainder of the period studied and appears to be limited mainly to aberrant ranges: the early occurrence of some taxa (such as Neolobites in the Middle Cenomanian) or the persistence of others (such as Epicheloniceras in the middle of the Upper Aptian).

Mots clés: Ammonites; Crétacé moyen; plaque arabique; Moyen-Orient; paléobiogéographie

Domaines: Stratigraphie

Luc Bulot. Endémisme et cosmopolitisme des faunes d'ammonites de la plaque arabique au Crétacé moyen (Aptien - Turonien). Carnets de Géologie / Notebooks on Geology, 2007, CG2007 (M02/10), pp.49-55. ⟨hal-00147671⟩