Books > Earth & environment > Earth sciences > Geology & the lithosphere
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High Quality Content by WIKIPEDIA articles! High Quality Content by
WIKIPEDIA articles! Mollisols are a soil order in USA soil
taxonomy. Mollisols form in semi-arid to semi-humid areas,
typically under a grassland cover. They are most commonly found
latitudinally in a band of 50 degrees north of the equator,
although there are some in South America, South-Eastern Australia
(mainly South Australia) and South Africa. Their parent material is
generally limestone, loess, or wind-blown sand. The main processes
that lead to the formation of grassland Mollisols are melanisation,
decomposition, humification and pedoturbation. Mollisols have deep,
high organic matter, nutrient-enriched surface soil (A horizon),
typically between 60-80 cm thick. This fertile surface horizon,
known as a mollic epipedon, is the defining feature of Mollisols.
Mollic epipedons result from the long-term addition of organic
materials derived from plant roots, and typically have soft,
granular, soil structure.
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