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the other hand, the peat occurring on the collapse scar areas is water<br />
saturated .<br />
The temperature of the frozen peat was found to be 0 ° C<br />
and the soil in the collapse scar area was found to be a relatively<br />
cool 5°C at a depth of 100 cm .<br />
Table 7 . Soil temperatures at sites T27, T28 and T35A<br />
Site Date Time Air Atmos . Soil Temperature ° C<br />
No . 1972 of Temp . °C<br />
Day Depth (cm .)<br />
2 .5 5 10 20 50 100<br />
T27 June 1600 21 18 16 10 2 0 0<br />
28<br />
T28A July 1150 18 18 16 14 10 0 0<br />
8<br />
T28B July 1200 18 16 15 14 .5 13 .5 10 5<br />
8<br />
T35A July 1515 28 28 15 6 .5 0 0 0<br />
13<br />
Ice Content :<br />
The ice content of Fibrisols associated with peat<br />
plateaus varies from 60 percent to 80 percent approximately,<br />
on a<br />
volume basis (Figure 9) . Fibrisols associated with peat polygons<br />
show a slightly higher ice<br />
content than do those associated with<br />
other perennially frozen peatlands .<br />
This<br />
is<br />
especially so at site T27C<br />
(Figure 9),<br />
a peat polygon located on the<br />
Horn Plateau, which has an<br />
ice content higher than 80 percent .<br />
Site<br />
T35A (Figure 9),<br />
also a peat<br />
polygon located on the east side of the Franklin Mountains,<br />
shows<br />
moderate amounts of ice in the profile but here large amounts of ice<br />
are found in the form of ice wedges . The ice content of the underlying<br />
mineral material varies greatly (45%-70%) with large amounts of
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