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C . rangiferina), feather mosses and some Carex spp . and Equisetum sp .
In Zone 0, under similar terrain conditions, the vegetation is
composed of lichens, ericaceous shrubs and some Carex spp . and
willows .
Some of the hummocks in this zone are completely devoid
of vegetation (see Plate 9B and Plate l0A) .
Physical and Chemical Characteristics :
The till material contains very few stones with the exception of
sample T6
obtained at Nahanni Hot Springs which contains a large
amount of stones (54%) . This site is located, however, on a mountain
slope and the till is probably mixed with various amounts of colluvial
material .
This shows in samples collected from the Camsell Range
(site T30) which is also a colluviated till and contains 34 percent
stones .
Soils developed on glacio-fluvial materials contain various
amounts of stones .
Soils developed on lacustrine and aeolian materials are stone
free .
The texture of soils developed on glacial till varies from
silt loam to silty clay .
Some of the soils sampled in the Dahadinni
River area are of clay texture .
The texture of soils on colluviated
till is generally loamy and on lacustrine and aeolian deposits
it is silty loam and loamy sand, respectively .
The depth of unfrozen soils developed on glacial till is
approximately 40 to 55 cm . Perennially frozen soils developed on
this material are,
however, much shallower and extend only approximately
half as deep as do the unfrozen soils . This is probably due to the
soil climate and the effect of permafrost on soil development .
The
depth of cryic soils which have been affected by cryoturbation varies
greatly but, generally, they range as do the cryic soils