RELATIONSHIP BETWEEN FOUR GROUND PATTERNS, STRUCTURE OF THE ACTIVE LAYER, AND TYPE AND DISTRIBUTION OF ICE IN THE PERMAFROST.
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
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Four ground patterns were investigated by means of trenches cut in the outwash near Thule, Greenland circular and linear depressions in unsorted material, polygonal troughs in unsorted material, sorted circles, and irregular mounds and depressions of low relief formed in unsorted finer grained material. Correlation is made between surface pattern, grain size and structure of the active layer, and type and distribution of ground ice for the patterns investigated. Classification of the active layer as disturbed, slightly disturbed, nd undisturbed is based on the condition of primary depositional bedding and the presence or absence of vertical sorting. Other features of the active layer, depending upon its type, re an accumulation of fines at the bottom of the active layer and on top of stones, and a siliceous calcareous evaporite on the under surface and clean washed coarser particles beneath the larger stones. Author