detrital

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de·tri·tus

 (dĭ-trī′təs)
n. pl. detritus
1. Loose fragments or grains that have been worn away from rock.
2. Disintegrated or eroded matter; debris: the detritus of past civilizations.

[French détritus, from Latin dētrītus, from past participle of dēterere, to lessen, wear away; see detriment.]

de·tri′tal (-trīt′l) adj.
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