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Rather
than an extreme fluctuation in obliquity through to a modest present
25 degrees, and a dramatic, virtually global ice sheet 4 billion
ago, receding to a more modest northern cap between 5 and 3.5 million
years ago, the positioning of the water-ice
in my contraction model suggests less extreme fluctuations in obliquity
and less severe ice coverage but a consistent movement of the crust
out of the polar regions into more equatorial latitudes. This suggests
that the reason for the presence of water-ice in mid-latitudes and
even at the equator, from the phyllocian era and the turn of the
Theikian era, is because those areas of crust used to lie within
the polar region.
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