eluvium

noun, plural e·lu·vi·a [ih-loo-vee-uh] /ɪˈlu vi ə/. Geology.

1. a deposit of soil, dust, etc., formed from the decomposition of rock and found in its place of origin.

noun plural -via (-vɪə)

1. a mass of sand, silt, etc: a product of the erosion of rocks that has remained in its place of origin

1. Residual deposits of soil, dust, and sand produced by the action of the wind.
2. Residual deposits of soil, dust, and rock particles produced by the in-situ decomposition and disintegration of rock.