Abstract
The study area belongs to the southern edge of the central High Atlas. It is limited to the North by the Sub-atlasic accident and to the South by the extension of the Eastern Anti Atlas formations. To determine the depositional environments of the Senonian series, a sedimentological analysis of the facies was carried out based on field observations by the recognition of sedimentary structures and textures. An exoscopic analysis of the quartz grains was also carried out by a systematic prospecting of the grain relief and of all the characters that will appear on the surface of the grain after the formation of the mother rock at the origin place, during transport, immobilization phases and deposition. It seems very interesting to prospect for the clayey side in these Upper Cretaceous reddish formations because the evolution of the clayey and non-clayey assemblages in this central basin of the High Atlas will depend mainly on the combination of tectonic, eustatic, climatic and other influences. The Senonian of Foum El Kous which has a less important thickness corresponds to continental deposits that act the role of a natural barrier that separates on both sides the two sub-basins: Sidi Ali Oubork in the East and Ait youl in the West.
Highlights
The Senonian presents itself in Morocco under four facies [1], i)
Into the fausse of the HAHA and the Khouribga region; it is a set of gray marl becoming yellow on outcrops and is found in the Middle Atlas. ii) Along the two central massifs of the High Atlas as well as in eastern Morocco, we find a mixed regime with continental and lagoon formations preceding a marine series or alternating with marl and limestone marine formations. iii) Generally, a mixed regime that goes laterally to the East to a lagoon or lagoon-continental regime
The Foum El Kous cut was realized between the two villages Imider and Arg n'Sidi Ali Ou Bourk with a NW-SE direction
Summary
The Senonian presents itself in Morocco under four facies [1], i). Into the fausse of the HAHA and the Khouribga region; it is a set of gray marl becoming yellow on outcrops and is found in the Middle Atlas. ii) Along the two central massifs of the High Atlas as well as in eastern Morocco, we find a mixed regime with continental and lagoon formations preceding a marine series or alternating with marl and limestone marine formations. iii) Generally, a mixed regime that goes laterally to the East to a lagoon or lagoon-continental regime. Iii) Generally, a mixed regime that goes laterally to the East to a lagoon or lagoon-continental regime This lateral passage is observed on two sides of the Western and Central High Atlas. His work concerned the southern part of the Western High Atlas and the Souss plain. He was able to bring stratigraphic precisions on the Senonian thanks to new paleontological discoveries based essentially on ammonite levels. A paleogeographic history for the Senonian of the northern slope of the High Atlas of Marrakech, from Jbel Sour in the East to Imin'Tanout in the west, based on the study of facies, along with their depositional environment and their evolution in space and time were proposed [5]
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