rhythmic stratification of sedimentary rocks eroded by wave action

geology erosion strata stratification sedimentary rocks layers layering horizontal lithology deposits rhythmite bedding layered structure limestone marlstone black shales shale eroded materials sediments coastal cretaceous turonian cenomanian steep cliff lithological weathered wave stone alternation superposition stacked stratigraphy pattern flysch facies abrasion platform wavecut cycles pedruquios madero costa quebrada cantabria liencres grey orange rhythmic action detail deposited layers broken coast spain