Encyclopedia of Planetary Landforms

2015 Edition
| Editors: Henrik Hargitai, Ákos Kereszturi

Sand-Wedge Polygon

  • János Kovács
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-3134-3_326


A polygon outlined by sand wedges underlying its boundaries.



 Sand-filled polygon; Soil-wedge polygon (not recommended: tessellation, tundra polygon, “Taimyr” polygon)


Sand-filled frost-fissure polygon net. Similar to ice-wedge polygons, their troughs have raised rims.


On Earth, open cracks can be 1–100 mm wide, 2–5 m or more deep, and 1 m to several tens of meters long (Mackay 1974; Murton 1996). Typical is a raised rim on either side of the fissure. Sometimes the rim may be as much as 0.5–1.0 m high. In plain view, the cracks form orthogonal or non-orthogonal networks, according to the kind of angles where cracks or their projections intersect, and complete or incomplete, depending on whether the cracks join (Lachenbruch 1962). Polygon diameter varies from a few meters to >100 m.


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    Primary filling (this entry)

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© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Department of Geology and MeteorologyUniversity of PécsPécsHungary