Keys to Soil Taxonomy: Great Groups

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Order: Aridisols
Suborder: Calcids

Code	Name	Description
GFA	Petrocalcids	Calcids that have a petrocalcic horizon that has its upper boundary within 100 cm of the soil surface.
GFB	Haplocalcids	Other Calcids.

Source: Keys to Soil Taxonomy, Eighth Edition. 1998.

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