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the last snowfall (Steidtmann 1973). Snow is preserved
inside dunes in Alaska and Antarctica (e.g. Bourke et al.
2009).
The phenomenon may not be restricted to the Earth:
Mars too may have niveo-aeolian features. The possibility
of cementation by moisture was advocated for some time as
a
observed to move. Although some examples of migration
have now been seen (see Chap. 8 ) , the possibility of
incorporation of ice in Martian dunes remains. Evidence
from orbital neutron spectrometry (Feldman et al. 2008)
suggests that the Olympia Undae dunes on Mars contain
enough
hydrogen
(i.e.,
water)
that
they
may
have
a
possible
explanation
for
why
Mars
dunes
were
not
substantial ice component.
 
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