Also known as negative grading or reverse grading.

An upward increase in mean grain size in a sedimentary bed, implying that the sedimenting grains were independantly mobile and deposited under the influence of grain-grain interactions.

IE, smaller grains are found at the bottom of the sedimentary bed, larger grains at the top, where the reverse of this is expected.

A term used in the fields of geology, palaeontology, soil engineering, environmental engineering, ecological studies and could probably apply to cooking too.

See also Kinematic sieving.

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