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crystals and thin vein ice .
This has been discussed in the work by
Zoltai and Tarnocai (1971) concerning palsas in northern Manitoba .
8 .1 .4 .2 . Fibrisols
These organic soils have developed dominantly from fibric sphagnum
and forest peat materials .
They are dominated by a fibric middle
tier, or middle and surface tiers if the mineral contact occurs in the
control section (above 160 cm) .
Two groups of Fibrisols were separated in the study area, based
on the type of parent peat materials and the associated peat landforms .
The descriptions of these groups are as follows :
Fibrisols developed from sphagnum peat materials .
These soils
are associated with perennially frozen bogs
(wooded peat plateaus,
palsas and peat polygons) and are mapped as bogs in the area
(Plate 2A and Plate 1B) .
Profile T28A Cryic Fibrisol (Figure 7 & Appendix I : Table 4) .
Of- 0 to 31 cm, grayish-brown (l0YR 5/2, moist), undecomposed
sphagnum peat (dominantly Sphagnum fuscum ) ; loose ; extremely
acid ; unrubbed fiber content 98 percent ; clear, wavy boundary .
Ofzl- 31 to 83 cm, very dark grayish-brown (l0YR 3/2, moist),
undecomposed, frozen, sphagnum peat ; layer of charcoal
at 57 cm depth ; 2 cm thick volcanic ash layer at 61 cm
depth ; extremely acid ; unrubbed fiber content 76 percent ;
segregated ice crystals ; ice content approximately 65 percent ;
clear, wavy boundary .
Ofz2- 83 to 112 cm, black (l0YR 2/l,,moist), undecomposed, frozen
Drepanocladus fen peat ; extremely acid ; unrubbed fiber
content 64 percent ; segregated ice crystals and vein ice ;
ice content approximately 70 percent ; clear,, wavy boundary .