Grus

 Grusis an accumulation of angular, coarse-grained fragments (particles ofsandandgravel) resulting from the granular disintegration by the processes ofchemicalandmechanical weatheringofcrystalline rocks(most notablygranitoids) generally in anaridor semiarid region.Grus sand, whencementedinto asandstone, will form anarkose.

Grus sand and granitoid

Within a European context most of the saprolite mantles of Late Cenozoic age are made up grus, contrasting with Mesozoic and Early Cenozoic saprolites made up of kaolinitic and ferrallitic material.

This article uses material from the Wikipedia article  Metasyntactic variable, which is released under the  Creative Commons Attribution-ShareAlike 3.0 Unported License.