loess

A buff to gray windblown deposit of fine-grained, calcareous silt or clay.

In geology, originally, a certain loamy deposit in the valley of the Rhine; now, by extension, any detrital accumulation more or less resembling the original loess occurring in other parts of the world.

A quaternary deposit, usually consisting of a fine yellowish earth, on the banks of the Rhine and other large rivers.

Any sediment, dominated by silt, of eolian (wind-blown) origin.

a fine-grained unstratified accumulation of clay and silt deposited by the wind