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Stadials and
interstadials are phases dividing the
Quaternary period, the last 2.6 million years. Stadial are colder periods and interstadials are warmer. Each phase has a
Marine Isotope Stage
(MIS) number, working backwards from the present, with stadial having
even numbers and interstadials odd numbers. Thus the current
Holocene is MIS1 and the
most recent ice age is MIS2. Stages are divided into warmer and colder intervals. MIS 5e (the
Eemian),
the hottest of the last million years, was the oldest interstadial of
MIS5, with MIS3 and MIS1 being interstadials and MIS2 and MIS4 being
colder stadials. In glacials a and c are stadials and b and d are warmer
interstadials. Thus MIS 6a, 6c and 6e are stadials and 6b and 6d are
interstadials.
Generally, stadials endure for a thousand years or less,
interstadials for less than ten thousand years, interglacials for more
than ten thousand and glacials for about one hundred thousand. The
Bølling Oscillation and the
Allerød Oscillation, where they are not clearly distinguished in the
stratigraphy, are taken together to form the Bølling/Allerød interstadial, and dated from about 14,700 to 12,700 years before the present.
[1]
Greenland ice cores show 24 interstadials during the one hundred thousand years of the
Wisconsin glaciation.
[2] Referred to as the
Dansgaard-Oeschger events,
they have been extensively studied, and in their northern European
contexts are sometimes named after towns, such as the Brorup, the
Odderade, the Oerel, the Glinde, the Hengelo, the Denekamp, etc.
See also
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