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IEF.Haplocryolls

Key to Subgroups

IEFA. Haplocryolls that have a lithic contact within 50 cm of the mineral soil surface. Lithic Haplocryolls
Soil Families and Soil Series in Subgroup

IEFB. Other Haplocryolls that have one or both of the following:
1. Cracks within 125 cm of the mineral soil surface that are 5 mm or more wide through a thickness of 30 cm or more for some time in normal years and slickensides or wedgeshaped aggregates in a layer 15 cm or more thick that has its upper boundary within 125 cm of the mineral soil surface; or
2. A linear extensibility of 6.0 cm or more between the mineral soil surface and either a depth of 100 cm or a densic, lithic, or paralithic contact, whichever is shallower. Vertic Haplocryolls
Soil Families and Soil Series in Subgroup

IEFC. Other Haplocryolls that have, throughout one or more horizons with a total thickness of 18 cm or more within 75 cm of the mineral soil surface, a fine-earth fraction with both a bulk density of 1.0 g/cm3 or less, measured at 33 kPa water retention, and Al plus 1/2 Fe percentages (by ammonium oxalate) totaling more than 1.0. Andic Haplocryolls
Soil Families and Soil Series in Subgroup

IEFD. Other Haplocryolls that have, throughout one or more horizons with a total thickness of 18 cm or more within 75 cm of the mineral soil surface, one or both of the following:
1. More than 35 percent (by volume) fragments coarser than 2.0 mm, of which more than 66 percent is cinders, pumice, and pumicelike fragments; or
2. A fine-earth fraction containing 30 percent or more particles 0.02 to 2.0 mm in diameter; and
a. In the 0.02 to 2.0 mm fraction, 5 percent or more volcanic glass; and
b. [(Al plus 1/2 Fe, percent extracted by ammonium oxalate) times 60] plus the volcanic glass (percent) is equal to 30 or more. Vitrandic Haplocryolls
Soil Families and Soil Series in Subgroup

IEFE. Other Haplocryolls that have:
1. A mollic epipedon that is 40 cm or more thick and has a texture finer than loamy fine sand; and
2. An irregular decrease in organic-carbon content from a depth of 25 cm below the mineral soil surface to a depth of 125 cm or to a densic, lithic, or paralithic contact if shallower; and
3. A slope of less than 25 percent; and
4. In one or more horizons within 100 cm of the mineral soil surface, distinct or prominent redox concentrations and also aquic conditions for some time in normal years (or artificial drainage). Aquic Cumulic Haplocryolls
Soil Families and Soil Series in Subgroup

IEFF. Other Haplocryolls that have:
1. A mollic epipedon that is 40 cm or more thick and has a texture finer than loamy fine sand; and
2. An irregular decrease in organic-carbon content from a depth of 25 cm below the mineral soil surface to a depth of 125 cm or to a densic, lithic, or paralithic contact if shallower; and
3. A slope of less than 25 percent. Cumulic Haplocryolls
Soil Families and Soil Series in Subgroup

IEFG. Other Haplocryolls that have both:
1. A slope of less than 25 percent; and either
a. An organic-carbon content of 0.3 percent or more at a depth of 125 cm below the mineral soil surface; or
b. An irregular decrease in organic-carbon content from a depth of 25 cm to a depth of 125 cm or to a densic, lithic, or paralithic contact if shallower; and
2. In one or more horizons within 100 cm of the mineral soil surface, distinct or prominent redox concentrations and also aquic conditions for some time in normal years (or artificial drainage). Fluvaquentic Haplocryolls
Soil Families and Soil Series in Subgroup

IEFH. Other Haplocryolls that have, in one or more horizons within 100 cm of the mineral soil surface, distinct or prominent redox concentrations and also aquic conditions for some time in normal years (or artificial drainage). Aquic Haplocryolls
Soil Families and Soil Series in Subgroup

IEFI. Other Haplocryolls that in normal years are saturated with water in one or more layers within 100 cm of the mineral soil surface for either or both:
1. 20 or more consecutive days; or
2. 30 or more cumulative days. Oxyaquic Haplocryolls
Soil Families and Soil Series in Subgroup

IEFJ. Other Haplocryolls that have both:
1. A mollic epipedon that is 40 cm or more thick and has a texture finer than loamy fine sand; and
2. A calcic horizon within 100 cm of the mineral soil surface. Calcic Pachic Haplocryolls
Soil Families and Soil Series in Subgroup

IEFK. Other Haplocryolls that have a mollic epipedon that is 40 cm or more thick and has a texture finer than loamy fine sand. Pachic Haplocryolls
Soil Families and Soil Series in Subgroup

IEFL. Other Haplocryolls that have a slope of less than 25 percent; and either
1. An organic-carbon content of 0.3 percent or more at a depth of 125 cm below the mineral soil surface; or
2. An irregular decrease in organic-carbon content from a depth of 25 cm to a depth of 125 cm or to a densic, lithic, or paralithic contact if shallower. Fluventic Haplocryolls
Soil Families and Soil Series in Subgroup

IEFM. Other Haplocryolls that have a calcic horizon within 100 cm of the mineral soil surface. Calcic Haplocryolls
Soil Families and Soil Series in Subgroup

IEFN. Other Haplocryolls that have an ustic moisture regime. Ustic Haplocryolls
Soil Families and Soil Series in Subgroup

IEFO. Other Haplocryolls that have a xeric moisture regime. Xeric Haplocryolls
Soil Families and Soil Series in Subgroup

IEFP. Other Haplocryolls. Typic Haplocryoll
Soil Families and Soil Series in Subgroup

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