Reference work entry
Thin marginal sand deposit around a sand dune.
Apron is a general term that refers to any sand deposit on the margins of a dune or dune field (Fig. 1). In individual barchanoid dunes, the apron is usually located just beyond the base of the slip face and often merges with sandy interdunes (Nielson and Kocurek 1987). In larger dune fields, the apron can be present as a sandy deposit around the exterior, which can either feather out into the surrounding terrain or be limited by fluvial features (Norris and Norris 1961; Nielson and Kocurek 1987). They are sometimes called extradune: area marginal to dune field which contains sediments of the same age and source as the dunes (Glenn 1979). Where the apron appears to form a base for a complex dune, it is also synonymous with plinth (Lancaster 1989). On Mars, large complex dunes and smaller individual dunes can be fully or partially surrounded by a dark,...
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