Fig. 16

Diagram showing the evolution of sustained, sandy sediment-laden turbulent flows when entering a marine or lacustrine basin. Bedload deposits (facies B1s, B2s and B3s) are composed of intrabasinal clasts (mostly shale clasts) floating in a sandy matrix, and are derived from the erosion of the basin substrate. Suspended load deposits (facies S1, S2 and S3) accumulate by the collapse of suspended materials due to a decrease in flow capacity. Lofting deposits (facies L) accumulate from density reversal plumes in saline basins. In freshwater lakes lofting is not possible, and shales accumulate as fallout deposits (facies S4)