FAUNAL COMPOSITIONS OF DOMERIAN AMMONITES FROM THE BAKONY MOUNTAINS (HUNGARY) AND COMPARISON WITH THE MAIN AREAS OF THE NORTH-WEST TETHYS

Originalities of the Domerian ammonite faunal compositions of Hungary (Bakony) are the weak representativity of the North-West European faun as and a very large proportion of Phylloceratidae which increases from the early Domerian to the late Domerian (25% to 68%). At the western Tethys scale, the Domerian corresponds to a regressive period and the provincialism becomes more and more strong, ubiquitous ammonites disap pear or are marginalized, diversity decreases and faunas are unbalance d (only one taxon predominates the fauna); however the exchanges supra -domains persist.