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Figure 2: Conceptual scheme for the genetic interpretation of clastic facies in hyperpycnal systems. Type B facies relates to bedload processes at the base of an overpassing long-lived turbulent flow. Type S facies originates from the gravitative collapse of sand-sized suspended materials carried in the turbulent flow. Facies L is composed of very fine-grained sandstones interbedded with laminated silts with abundant plant debris and mica, accumulated by fallout from a lofting plume. Facies L is exclusive of marine/saline environments.