Les ammonites du Pliensbachien du jebel Bou Rharraf (Haut Atlas oriental, Maroc) |
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Authors: | Christian Meister Jean-Louis Dommergues Nadifa Lachkar |
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Institution: | a Département de géologie et de paléontologie, muséum d’histoire naturelle de Genève, 1, route de Malagnou, CP 6434, 1211 Genève, Suisse b UMR CNRS 5561, biogéosciences Dijon, centre des sciences de la Terre, université de Bourgogne, 6, boulevard Gabriel, 21000 Dijon, France c 60, Shearsmith House, Hindmarsh Close, E1 8H London, Royaume-Uni d Laboratoire de géosciences et environnement, département des sciences de la Terre, faculté des sciences et techniques, université Cadi-Ayyad, Marrakech, Maroc |
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Abstract: | The originality of the sedimentary deposits and ammonite faunas in the jebel Bou Rharraf concerns “Ammonitico Rosso” facies, the westernmost known for the Pliensbachian, and a strong diversity of the Phylloceratida (Phylloceras, Calaiceras, Zetoceras, Partschiceras and Juraphyllites). The morphological disparity is also important in Galaticeras, Miltoceras and Tauromeniceras. If some taxa like Miltoceras taguendoufi and Mauretaniaceras elmii nov. gen., nov. sp. seem endemic to the High Atlas, most part of the Pliensbachien ammonites of the eastern High Atlas are classic for the southern margin of the western Tethys. Three genera (Callomoniceras, Appenninoceras, Mauretaniaceras) and three new species (Miltoceras involutum, Tropidoceras heterogeneum, Mauretaniaceras elmii) are described. An analysis using the “Discrete Cosine Transform” (DCT) method allows the better understanding of the morphospace of the rib patterns for the Fuciniceras from jebel Bou Rharraf. The biostratigraphy of the High Atlas is also improved with a set of 19 biohorizons for the Pliensbachian and the base of the Toarcian that are correlable with the Tethyan areas. |
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Keywords: | Ammonites Jurassique infé rieur Pliensbachien Haut Atlas Maroc Biostratigraphie Palé obiogé ographie |
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