Periglacial features associated with permafrost-affected (Cryosolic) soils in the Northwest Territories and Nunavut

High-centred lowland ice-wedge polygons

High-centred lowland ice-wedge polygons. Material is dominated by peat.

Ice wedge

Ice wedge associated with high-centred lowland polygons.

Low-centered lowland ice-wedge polygons

Low-centered lowland ice-wedge polygons in the foreground and high-centred lowland polygons and a pingo in the background.

Nonsorted stripes

Linear, alternating bands of coarse and fine material formed on gentle slopes by freeze–thaw processes.

Sorted circles and nets.

Patterned ground features formed by freeze–thaw processes that sort stones and fines into circular or polygonal arrangements, reflecting active soil movement in cold, periglacial environments.

Sorted nets

Polygonal patterned ground features formed by freeze–thaw processes that sort coarse fragments into interconnected stone borders surrounding finer‑textured soil in cold, periglacial environments.