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Order: Aridisols
Suborder: Gypsids

Code Name Description
GDA Petrogypsids Gypsids that have a petrogypsic or petrocalcic horizon that has its upper boundary within 100 cm of the soil surface.
GDB Natrigypsids Other Gypsids that have a natric horizon that has its upper boundary within 100 cm of the soil surface.
GDC Argigypsids Other Gypsids that have an argillic horizon that has its upper boundary within 100 cm of the soil surface.
GDD Calcigypsids Other Gypsids that have a calcic horizon that has its upper boundary within 100 cm of the soil surface.
GDE Haplogypsids Other Gypsids.

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


 

Links:
Keys to Soil Taxonomy > Orders > Suborders > Great Groups

 
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