Lag Deposit

  • John C. DixonEmail author
Living reference work entry


Surface accumulation of materials of diverse origin, such as regolith, rock, and mineral particles with most being in the granule to cobble size range. Results from the removal of finer material by fluvial or aeolian processes or by matrix removal as a result of differential weathering. The type of lag present is a function of local regolith, landform, and bedrock (Eggleton et al. 2008).



Stone mantles of varying size particles are common on planetary surfaces and asteroids. These mantle materials range in size from granule to boulder size and are angular to rounded in shape. Often saltation-induced winnowing leaves a single-layer lag of granules on a finer-grained surface (Greeley et al. 2002).


  1. (1)

    Aeolian/fluvial lag

  2. (2)

    Sublimation lag

  3. (3)

    Weathering residuum lag



Substantial aeolian deflation can be inferred from the presence of erosion remnants such as inverted landforms or pedestal craters. Depletion of small...


Landing Site Aeolian Process Coarse Debris Desert Pavement Terrestrial Analog 
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© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Department of GeosciencesUniversity of ArkansasFayettevilleUSA