
Mollisols are a soil order in USDA soil taxonomy. Mollisols form in semi-arid to semi-humid areas, typically under a grassland cover. They are most commonly found in the mid-latitudes, namely in North America, mostly east of the Rocky Mountains, in South America in Argentina (Pampas) and Brazil, and in Asia in Mongolia and the Russian Steppes. The...
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http://en.wikipedia.org/wiki/Mollisol

one of the 12 soil orders in the U.S. Soil Taxonomy. Mollisols are characterized by a significant accumulation of humus in the surface horizon, or ... [2 related articles]
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http://www.britannica.com/eb/a-z/m/109

a productive agricultural soil common to the world's grasslands, characterized by a dark surface layer rich in organic matter. Cf.
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https://www.infoplease.com/dictionary/mollisol
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