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ABSTRACT

Sedimentologists have noted that turbidite sequences become thinner bedded and finer grained as traced downcurrent. We provide a semi-quantitative explanation of this behavior based on the idea that turbulence in a turbidity current decays downcurrent so that in its zone of deposition both the total load in suspension and the grain size of that load decrease with increasing distance from the source. Semi-empirical equations proposed by Chézy, Lokhtin and Sundborg are central to our argument.