Key to Subgroups
GECM. Other Paleargids that are dry in all parts of the moisture control section for less than three-fourths of the time (cumulative) when the soil temperature is 5 oC or higher at a depth of 50 cm and have a soil moisture regime that borders on ustic. Ustic Paleargids
Description of Subgroups
GECM. Ustic Paleargids.—These are the Paleargids that have a soil moisture regime that borders on ustic. These soils do not have a high shrink-swell potential; saturation with water for 1 month or more within 100 cm of the soil surface in normal years; a calcic horizon; a sandy or sandy-skeletal particle-size class from the soil surface to a depth of 50 cm or more; or a significant amount of volcanic glass, pumice, cinders, pumicelike fragments, durinodes, nodules, and concretions. These soils occur in desert areas of the United States and Argentina.
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