Grus (geology)


Grus is an accumulation of angular, coarse-grained fragments resulting from the granular disintegration by the processes of chemical and mechanical weathering of crystalline rocks generally in an arid or semiarid region. Grus sand, when cemented into a sandstone, will form an arkose.
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.