Alevrity

Alevrity

 

(from Greek aleuron—flour), a group of loose sedimentation rocks consisting of small chips with grains 10–100 microns in size. The name was proposed in 1930 by A. N. Zavaritskii for rocks that have lost characteristic properties of sands but are not yet clay. Alevrity includes dust, silt, loess, and loessal rocks.