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Oxisol
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==Genesis== [[Fossil]] oxisols are known from the first appearance of free [[oxygen]] in the [[Earth's atmosphere|atmosphere]] about 2,200 million years ago. In warm periods like the [[Mesozoic]] and [[Paleocene]], oxisols extended to areas that now have quite cool climates, extending well into [[North America]] and [[Europe]]. It is believed oxisols became vegetated later than [[ultisols]] or [[alfisols]], probably because vegetation took a long time to adapt to the infertility of oxisols.
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