Cyclic sediments
（重定向自Cyclic sedimentation）
![High Atlas middle liassic carbonate platform of Morocco and succession of regressive, autocyclic,](/Images/godic/202501/07/Bloc_diagramme_Lias_Haut_Atlas0311.jpg")
![](/Images/godic/202501/07/Cycles_régressifs_de_comblement0311.jpg")
![Model of a virtual](/Images/godic/202501/07/Cycle_virtuel_émersif0311.jpg")
![](/Images/godic/202501/07/Desiccation_Rnim0311.jpg")
Cyclic sediments (also called rhythmic sediments) are sequences of sedimentary rocks that are characterised by repetitive patterns of different rock types (strata) within the sequence. Cyclic sediments can be identified as either autocyclic or allocyclic, and can be hundreds or even thousands of metres thick. The study of sequence stratigraphy was developed from controversies over the causes of cyclic sedimentation.