Abstract

The uppermost lower Toarcian and middle Toarcian succession of the Central Unit of the South Riffian Ridges, particularly in the El Heitouf and Sned sections, is rich in benthic macrofauna and contains rare middle Toarcian ammonites of the Bifrons and Gradata zones. Eleven species and four morphs (one is nov.) of terebratulides arranged into three genera, have been identified, which are: Lobothyris arcta, L. crithea, L.? hispanica, L. punctata morph clevelandensis, Sphaeroidothyris decipiens, S. dubari, S. aff. dubari, S. vari, Telothyris arnaudi, T. jauberti, T. jauberti morph depressa, T. jauberti morph nabanciensis, T. jauberti morph triangularis morph nov., T. monleaui, and T. pyrenaica, as well as eleven species of ammonites, Collina aff. meneghinii, Harpoceras sp. indet., Haugia cf. jugosa, H. cf. navis, Hildaites cf. murleyi, Hildoceras bifrons, H. lusitanicum, H. semipolitum, H. sublevisoni, Phymatoceras cf. formosum and Polyplectus sp. These brachiopod and ammonite taxa are described and illustrated for the first time from the Central Unit of the South Riffian Ridges, Morocco. Most are new occurrence taxa that are common to the most Peritethyan basins of the northern and southern margins of the western Tethys, particularly north Africa, southwest Europe and the Subboreal Domain of western France and southeast England, and the Lusitanian Basin of the Central Atlantic margin of Portugal.

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