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The Carboniferous formations of Migoumess, Tirhela and Idmarrach (central Morocco): lithology, biostratigraphy and geodynamic consequences

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COMPTES RENDUS GEOSCIENCE
卷 334, 期 1, 页码 67-72

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EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/S1631-0713(02)01699-1

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Central Morocco; Carboniferous; sediments; biostratigraphy; palaeogeography; geodynamic

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New biostratigraphical data based on foraminifers, algae and pseudoalgae indicate that the limestone pebbles of the channelized polygenic conglomerates of the Migoumess formation contain Late Visean (V3bgamma-V3c) assemblages. That confirms the Westphalian age attributed to this formation by Hollard [Zdt. Geol. Ges. 129 (1978) 495-512]. The Tournaisian age assigned to it by palynology [C. R. Acad. Sci. Paris, serie II 310 (1990) 1573-1576] cannot be retained. The Tirhela formation, Late Visean and Serpukhovian (E1) in age, is coeval with the Akerchi formation [Berkhli, these d'Etat, 1999; Berkhli et al., J. Afr. Earth Sci. (accepte)]. The Idmarrach formation, mapped as a thrust sheet [C. R. Acad. Sci. Paris, serie II 310 (1990) 1573-1576], is dated as Serpukhovian (El) and its thrusting is consequently post-Serpukhovian. Palaeogeographic and geodynamic consequences are listed.

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