Rare Occurrence of Mudboils
Rare occurrence of mudboils, Rib-and-Trough structures, and frost polygons together in a shallow lakeLocation:
Kaminak Lake area, SW Nunavut, in vicinity of
62° 15' N, 95° W
This image, from an altitude of ~200m, shows a rare assemblage of sub-lacustrine periglacial features – mudboils, Rib-and-Trough Structures, and frost crack fissures, juxtaposed. Rib-and- Trough indicates that this is a more-or-less permanent lake and not just a temporarily flooded mudboil-ornamented surface. The preservation of frost cracks indicated that the mudboil surface is unusually static as these features are almost never preserved together at this latitude. The average water depth must be 3m or less. See also images listed under image 0120.
Updated 05/03/2010 AW