The present work studies the Harhoura coastal deposits located immediately southwest of Rabat, Morocco. The base of this sequence has been previously dated by 14C as 9900 +/- 150 BP. These deposits exhibit a thick record potentially related to the footprint of a high-energy storm.They are primarily characterized by coarse-grained dark shelly/gravelly units bearing highly fragmented shells inherited from shallow water platform. A high amount of organic matter was also observed. The provenance signature using modal analysis of detrital grains, and major and trace elements indicates two main phases.The first sedimentation is a marine within the shallow platform, followed by a coastal phase belonging to the littoral zone. The first source to sink pathway indicate that platform was supplied by sediments from felsic magmatic source, low-grade and medium metamorphic rocks belonging to the fold and thrust belt of the Sehoul Block, with a minor contribution from mafic source rocks. The second pathway indicates their subsequent remobilization and deposition on the calcarenite coastal plain by mean of high-energy storm(s). The provenance relationship of the latter phase was corroborated by the geochemical signature using major, trace and rare earth elements, assigning their latest source to a coastal-marine origin.