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Stratigraphic and geodynamic characterization of the Jurassic-Cretaceous «red beds» of Errachidia-Msmrir transverse (central High Atlas, Morocco)
Mohamed El Ouali, Lahcen Kabiri, Badre Essafraoui, Ali Charroud, Stéphane Bodin, Adrian Immenhauser, Amina Kassou, Ismail Chaaou

Building: Muséum d'Histoire Naturelle de Genève
Room: Amphithéâtre
Date: 2018-12-05 11:20 AM – 11:40 AM
Last modified: 2018-11-30

Abstract


The Moroccan central High Atlas is characterized by a special form, many large syncline bowls separated by a set of narrow anticlines. The Middle Jurassic-Lower Cretaceous «red beds» are deposed in the center of these synclines, with unconformity-contact, on the carbonate formations of the Lower and Middle Jurassic. Formed by three superposed units (Jenny et al., 1981), the Guettioua Formation, the Iouaridène Formation and the Jbel Sidal Formation, theses « red beds »had been attributed to different ages from the Middle Jurassic to the Lower Cretaceous (Infra-Cenomanian). This paper is interested in description and interpretation, to make a correlation between many sections of different locations of these red sediments, from Errachidia in the east to Msmrir in the west, going through Imilchil. In fact, five sections have been logged at different locations, following the E-W transverse: Zaabel, Errachidia, Tadighoust, Msmrir and Imilchil. From east to west, some differences are highlighted: the western sections are more important in thickness; the facies are more clayey with many sandstone levels in the west; the sandstone deposits show some trace-fossils (dinosaur footsteps and bones with plant remains) in Msmrir and Imilchil sections.