Chernozem soils are rich in calcium, which appears in excess in calcium carbonate precipitated in the lower B-horizon or just beneath the B-horizon. It has been noted that chernozem soils develop in parent material rich in calcium carbonate. The origin and distribution of chernozems soils have long attracted the soil scientist. Chernozem soils are important in the United States and Canada, where they form a north-south belt starting in Alberta and Saskatchewan and running through the Great Plains of the United States to central Texas. A similar area lies in Argentina. Other areas are mapped in Australia and Manchuria.
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