Tournaisian (Early Carboniferous/Mississippian) ammonoids from the Ma'der Basin (Anti-Atlas, Morocco)

Abstract

Abstract. Three succeeding assemblages of Early Tournaisian (Mississippian) ammonoids are described from Fezzou (Ma'der) in the Anti-Atlas of Morocco; they are, in ascending order, composed of the following genera: (1) Gattendorfia-Eocanites Assemblage: Acutimitoceras, Costimitoceras, Imitoceras, Kornia, Gattendorfia, Kazakhstania, and Eocanites; (2) Gattendorfia-Kahlacanites Assemblage: Acutimitoceras, Hasselbachia, Gattendorfia, Becanites, and Kahlacanites; and (3) Goniocyclus-Protocanites Assemblage: Globimitoceras, Imitoceras, Gattendorfia, Goniocyclus, Eocanites, and Protocanites. The following taxa are newly described: Globimitoceras rharrhizense n. sp., Acutimitoceras sarahae n. sp., A. endoserpens n. sp., A. pentaconstrictum n. sp., Costimitoceras aitouamar n. sp., Hasselbachia arca n. sp., Kornia citrus n. gen. n. sp., Gattendorfia lhceni n. sp., and G. gisae n. sp. Drei aufeinander folgende Vergesellschaftungen von Ammonoideen aus dem Tournaisium (Mississippium) werden von Fezzou (Ma'der) im Anti-Atlas von Marokko beschrieben; diese werden, in aufsteigender Reihenfolge, durch die folgenden Gattungen zusammen gesetzt: (1) Gattendorfia-Eocanites Assemblage: Acutimitoceras, Costimitoceras, Imitoceras, Kornia, Gattendorfia, Kazakhstania und Eocanites; (2) Gattendorfia-Kahlacanites Assemblage: Acutimitoceras, Hasselbachia, Gattendorfia, Becanites und Kahlacanites; und (3) Goniocyclus-Protocanites Assemblage: Globimitoceras, Imitoceras, Gattendorfia, Goniocyclus, Eocanites und Protocanites. Die folgenden Taxa werden neu beschrieben: Globimitoceras rharrhizense n. sp., Acutimitoceras sarahae n. sp., A. endoserpens n. sp., A. pentaconstrictum n. sp., Costimitoceras aitouamar n. sp., Hasselbachia arca n. sp., Kornia citrus n. gen. n. sp., Gattendorfia lhceni n. sp. und G. gisae n. sp. doi:10.1002/mmng.200700003