Nonsorted Circle

Living reference work entry


Fine-grained material accumulated in circle or small circular buttes.




Circular features in periglacial zones on Earth (French 1996) with areas of heaves and troughs (Fig. 1). Their interior is characteristically vegetation-free or partially vegetated; however, they are usually surrounded by dense vegetation (Daanen et al. 2008; Raynolds et al. 2008) (e.g., tussocks, lichens, peat). Sometimes they display regular involution (festooning) (Allaby 2008).


Soil Expand Unfrozen Water Periglacial Zone Regular Involution Frost Boil 
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© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Laboratoire de Planétologie et Géodynamique de NantesUniversité de Nantes/CNRS UMR6112NantesFrance