New Late Asbian/Early Brigantian (Late Visean, Mississippian) dates in the Mouchenkour Formation (central Morocco) : palaeogeographical consequences.

International audienceNew datings of calcareous sandstone lenses and olistolites exposed in the middle part of the siliciclastic Mouchenkour Formation indicate a Late Asbien/Early Brigantian age (Cfm7/Cfm8 Moroccan biozone). The calcareous microfossil assemblages are characterized by the problematic algae Ungdarella, Fasciella and Koninckopora and foraminifers Archaediscus (concavus stage), Pseudoendothyra and Eostafella. An Asbien/Brigantian palaeogeography based on the depositional environments is reconstructed from northwest to southeast, from the Tizra to the Mouchenkour areas. The units, although in tectonic contacts, nearly preserve their initial location and relations