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Brunisols on coarser deposits and at higher elevations .<br />
Cryic<br />
Gleysols are found on poorly drained areas .<br />
The organic soils are<br />
mainly Cryic Fibrisols . Alpine soils are found associated with<br />
nonsorted circles above the timberline .<br />
Black spruce is the dominant<br />
species of vegetation but aspen is very common as a result of repeated<br />
forest fires . White spruce is found in the valleys on better drained<br />
sites . Alpine fir- forms the timberline at elevations of approximately<br />
3,600 feet .<br />
Permafrost is<br />
discontinuous on poorly drained fine-textured mineral<br />
soils and widespread on peatlands .<br />
The perennially frozen peatlands<br />
take the<br />
form of peat plateaus and palsas composed dominantly of high<br />
ice content peat materials .<br />
Very little active collapsing is found<br />
on the peatlands . In old collapse areas, however, active palsa<br />
development was noted .<br />
Zone 6 . This Zone covers the plains of the Mackenzie and Liard Rivers .<br />
This area is divided into two subzones, 6S (south) and 6N (north) .<br />
Subzone 6S<br />
spans the Upper Mackenzie River from Mills Lake to<br />
approximately Willowlake River and the Liard River Plain .<br />
The Trout<br />
Lake and Kakisa River area is<br />
also included in this subzone in spite<br />
of the fact that it is somewhat higher in elevation . Based on<br />
information collected during the 1972 season, no great differences<br />
were found in soils and permafrost as compared to other areas of 6S .<br />
The soils are dominantly Luvisols developed on well to imperfectly<br />
drained till and glaciolacustrine deposits .<br />
Brunisols dominate the<br />
sandy aeolian deposits and the older alluvial terraces .<br />
Regosolic<br />
soils are associated with the recent alluvial deposits . Gleysolic
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