Grus (geology)

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Grus sand and granitoid

Grus is an accumulation of angular, coarse-grained fragments (particles of sand and gravel) resulting from the granular disintegration by the processes of chemical and mechanical weathering of crystalline rocks (most notably granitoids) generally in an arid or semiarid region.[1] 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.[2]

See also[edit]


  1. ^ Robert L. Bates and Julia A. Jackson (editors) (1984). Dictionary of Geological Terms (3rd edition).CS1 maint: Uses authors parameter (link)
  2. ^ Migoń, Piotr; Lidmar-Bergström, Karna (2002). "Deep weathering through time in central and northwestern Europe: problems of dating and interpretation of geological record". Catena. 49: 25–40.