GEOLOGIA DI ALCUNE SUCCESSIONI TORBIDITICHE CRETACEO-TERZIARIE APPARTENENTI AI «FLYSCH MAURETANIENS» E ALLA «NAPPE NUMIDIENNE» DEL RIF SETTENTRIONALE (MAROCCO)

Abstract

The Realm of the Allochtonous Flysch in the Riff Chain (Ma­rocco) consists of five allochtonous complexes: (I) Prédorsaliennes Units; (2) Maurétaniens Flysch; (3) Ride Taraquide; (4) Massyliens Flysch; (5) Nappe Numidienne. They overlie the external zones. The studied turbidite sequences both pertain to Maurétaniens Flysch (Nappe du Jebel Tisirène and Nappe des Beni Ider) and to the Nap­pe Numidienne (Unité de Talaa Lakra and Numidian Flysch s.s.). The various sequences can be grouped according to three main sequences: (a) calcareous turbidites with varicoloured argillites - marly-arenaceous-micaceous turbidites (some times containing slumps in their lower portion): thickening-upward sequences like Be­ni Ider and partly like Tisirène; (b) varicoloured argillites - quartza­renite turbidites with sandy claystones: sequences like Numidian Flysch; (c) varicoloured argillites (some times containing slumps) - marly-arenaceous-micaceous turbidites - quartzarenite turbidites with sandy claystones: «mixed» sequences like Talaa Lakra.