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 geological weathered wave stone alternation superposition stacked stratigraphy pattern flysch facies abrasion platform wavecut cycle igneous pedruquios madero costa quebrada cantabria spain liencres rhythmic action deposited layers broken coast