Their northern limit ( except fossil soils ) is very sharply defined in North America by the limits of maximum glaciation during the Pleistocene, because ultisols typically take hundreds of thousands of years to form far longer than the length of an interglacial period today.
12.
With the exception of some exceedingly old soils which have a clayey, grey-green horizon that is quite unlike any present soil and clearly formed in the absence of O 2, most fossil soils can be classified into one of the twelve orders recognised by this system.
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