Diamicton (also diamict) (from Greek δια (dia-): through and μεικτός (meiktós): mixed) is a terrigenous sediment (a sediment resulting from dry-land erosion) that is unsorted to poorly sorted and contains particles ranging in size from clay to boulders, suspended in an unconsolidated matrix of mud or sand.
Today, the word has strong connotations to glaciation but can be used in a variety of geological settings.
Although the term is most commonly applied to unsorted glacial deposits (i.e., glacial till), other processes that create diamictons are solifluction, landslides, debris flows, and turbiditic olistostromes.
[2][3] The term can generally be applied to types of siliciclastic sediments and sedimentary rocks, and acts as a root name for sediments that are poorly sorted and contain a wide clast size range.
The British Geological Survey (BGS), based in the UK, defines diamicton to comprise over 50% pre-existing siliceous rock clasts, but otherwise having undefined composition.