Turbidity current

turbidity current -- n. A bottom fast-flowing current that moves down a slope, depositing suspended sediments over the floor of a body of water
turbidity flow -- n. A flow of dense, muddy water moving down a slope due to a turbidity current ...

A vertical sequence of sediments deposited by a turbidity current. Because the largest particles of the current settle first a turbidite will be graded deposits with coarsest grain sizes at the bottom and finer grain sizes going upwards.

See also: Tectonic, Trace, Subsidence, Strike, Sediment