## 6 Conclusions  
This detailed study, covering the range from the \"Infra-Cenomanian\" to the Cenomanian-Turonian, shows that in the Errachidia-Boudnib-Erfoud Basin, the studied series begins with red sandstone deposits with oblique laminations, which correspond to the Ifezouane Formation attributed to the Albian. Its middle part consists of alternating red clays, sandstone beds, green marl levels, and primary gypsum forming the Aoufous Formation  
Figure 15: Correlation of the studied sections in the Errachidia–Boudnib–Erfoud Basin, with other sections in the Ouarzazate and Agadir basins along the Agadir–Tazzouguerte east–west transect. The seven western sections on the transverse are from [17; 39; 57].  
attributed to the Cenomanian. The series is topped by a carbonate unit, which corresponds to the Akrabou Formation dated to the Cenomanian-Turonian.  
The variations recorded, such as the deposits throughout the studied sections, reflect changes in the depositional environments along the basin. Indeed, the Ifezouane Formation with its sandstone deposits shows a fluvial environment. The deposits of the Aoufous Formation attest to an alluvial plain environment that evolves towards a coastal lagoon and then towards a shallow marine environment in its upper part. The Akrabou carbonate Formation, on the other hand, shows a shallow lagoon to an open marine depositional environment.  
The complex series underlying the Cenomanian-Turonian platform shows variations in thickness throughout the basin. Thus, it reaches its maximum thickness in Tinghir and reduces strongly towards the west, at Anounizme, Tazoughmite, and Goulmima. These variations in thickness may be related to tectonic movements of the basement. Indeed, the structuring of the latter could be at the origin of the individualization of grabens receptacles for deposits and horsts where the series is strongly thinned.  
The Cenomanian-Turonian carbonate platform, on the other hand, shows an opening towards the east of the basin. This is related to the Tethyan transgression during this period. However, it thins from the east to the west until it disappears at Anounizme. The carbonate unit reappears again beyond this locality and thickens towards the Agadir basin. This makes it possible to suppose the existence of a paleorelief, a structural high, during the Cenomanian-Turonian at the Anounizme locality. This paleorelief could be the limit between the Tethyan Errachidia-Boudnib-Erfoud Basin and Atlantic-related Ouarzazate and Agadir basins.  
Conceptualization, I.C., L.K., B.E. and A.C.; methodology, I.C. and B.E.; software, I.C. and B.E.; validation, B.E., A.C., M.A. and C.N.d.C.; formal analysis, I.C.; data curation, I.C.; writing--original draft preparation, I.C., L.K., B.E. and A.C.; writing--review and editing, H.S.M., M.A., K.A., C.N.d.C. and M.S.F.; visualization, I.C.; supervision, L.K. and B.E.; project administration, M.A.; funding acquisition, K.A. and M.S.F. All authors have read and agreed to the published version of the manuscript.  
This research was funded by Researchers Supporting Project number (RSP-2021/249), King Saud University, Riyadh, Saudi Arabia.  
Not applicable.  
The data presented in this study are available upon request from the corresponding author.  
The authors declare no conflict of interest.