1. Thick permafrost characterized by massive ice wedges has developed in these sediments. 2. Ice wedges usually appear in a polygonal pattern known as ice wedge polygons. 3. Ice wedges usually appear in a polygonal pattern known as ice wedge polygons.4. Several techniques have been used to deduce the ice wedging , patterning and hummocked ground. 5. Ice wedges enlarge with successive seasons of freezing and thawing.6. Some ice wedges that have been buried for centuries are revealed during excavations or landslides. 7. These sediments contain pollen typical of the mammoth tundra-steppe environments and large ice wedge polygon systems. 8. Ice wedges indicate a long period of permafrost.9. As this process continues over many years ice wedges can grow, up to the size of a swimming pool. 10. When ice wedges connect to one another, they can form tundra polygons, which are also visible at Pingo National Landmark.
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