Abstract
Palynological researches carried out on detrital Upper Triassic and Early Liassic series of the Middle Atlas and High Moulouya, bring out dating elements on five new sites distributed along a north-south transverse. The analysed horizons are situated below, inside and above the basaltic complex. The infrabasaltic top series are dated from the upper Carnian in the western tabular Middle Atlas series, and from the Norian in the southern Middle Atlas, as well in the High Moulouya region. In the tabular Middle Atlas, a sedimentary intercalation inside the basaltic flows dates from the late Carnian to middle Norian. In the High Moulouya area, suprabasaltic deposits are noticed from Norian — Rhaetian to lower Liassic ages. This dating shows on one hand, that the main part or the whole basaltic effusions in the studied area are located from the upper Triassic times and on the other hand they allow to assert a diachronism of the regional basaltic effusions.
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