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IGE.Argiustolls

Key to Subgroups

IGEA. Argiustolls that have both:
1. A lithic contact within 50 cm of the mineral soil surface; and
2. When neither irrigated nor fallowed to store moisture, have one of the following:
a. A frigid temperature regime and a moisture control section that in normal years is dry in all parts for fourtenths or more of the cumulative days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 5 oC; or
b. A mesic or thermic soil temperature regime and a moisture control section that in normal years is dry in some or all parts for six-tenths or more of the cumulative days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 5 oC; or
c. A hyperthermic, isomesic, or warmer iso soil temperature regime and a moisture control section that in normal years:
(1) Is moist in some or all parts for fewer than 90 consecutive days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 8 oC; and
(2) Is dry in some or all parts for six-tenths or more of the cumulative days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 5 oC. Aridic Lithic Argiustolls
Soil Families and Soil Series in Subgroup

IGEB. Other Argiustolls that have both:
1. A lithic contact within 50 cm of the mineral soil surface; and
2. Above the argillic horizon, either an albic horizon or a horizon that has color values too high for a mollic epipedon and chroma too high for an albic horizon. Alfic Lithic Argiustolls
Soil Families and Soil Series in Subgroup

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

IGED. Other Argiustolls that have both:
1. In one or more horizons within 100 cm of the mineral soil surface, redox depletions with a chroma of 2 or less and also aquic conditions for some time in normal years (or artificial drainage); and:
2. One or both of the following:
a. 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 wedge-shaped aggregates in a layer 15 cm or more thick that has its upper boundary within 125 cm of the mineral soil surface; or
b. 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. Aquertic Argiustolls
Soil Families and Soil Series in Subgroup

IGEE. Other Argiustolls that have both:
1. One or both of the following:
a. 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 wedge-shaped aggregates in a layer 15 cm or more thick that has its upper boundary within 125 cm of the mineral soil surface; or
b. 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; and
2. When neither irrigated nor fallowed to store moisture, have one of the following:
a. A frigid temperature regime and a moisture control section that in normal years is dry in all parts for fourtenths or more of the cumulative days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 5 oC; or
b. A mesic or thermic soil temperature regime and a moisture control section that in normal years is dry in some or all parts for six-tenths or more of the cumulative days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 5 oC; or
c. A hyperthermic, isomesic, or warmer iso soil temperature regime and a moisture control section that in normal years:
(1) Is moist in some or all parts for fewer than 90 consecutive days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 8 oC; and
(2) Is dry in some or all parts for six-tenths or more of the cumulative days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 5 oC. Torrertic Argiustolls
Soil Families and Soil Series in Subgroup

IGEF. Other Argiustolls that have all of the following:
1. A mollic epipedon that has a texture finer than loamy fine sand and that is either:
a. 40 cm or more thick in a frigid temperature regime; or
b. 50 cm or more thick; and.
2. One or both of the following:
a. 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 wedge-shaped aggregates in a layer 15 cm or more thick that has its upper boundary within 125 cm of the mineral soil surface; or
b. 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; and
3. When neither irrigated nor fallowed to store moisture, either
a. A mesic or thermic temperature regime and a moisture control section that in normal years is dry in some part for four-tenths or less of the cumulative days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 5 oC; or
b. A hyperthermic, isomesic, or warmer iso soil temperature regime and a moisture control section that in normal years is dry in some or all parts for fewer than 120 cumulative days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 8 oC. Pachic Udertic Argiustolls
Soil Families and Soil Series in Subgroup

IGEG. Other Argiustolls that have both:
1. One or both of the following:
a. 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 wedge-shaped aggregates in a layer 15 cm or more thick that has its upper boundary within 125 cm of the mineral soil surface; or
b. 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; and
2. When neither irrigated nor fallowed to store moisture, either:
a. A mesic or thermic soil temperature regime and a moisture control section that in normal years is dry in some part for four-tenths or less of the cumulative days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 5 oC; or
b. A hyperthermic, isomesic, or warmer iso soil temperature regime and a moisture control section that in normal years is dry in some or all parts for fewer than 120 cumulative days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 8 oC. Udertic Argiustolls
Soil Families and Soil Series in Subgroup

IGEH. Other Argiustolls that have both:
1. One or both of the following:
a. 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 wedge-shaped aggregates in a layer 15 cm or more thick that has its upper boundary within 125 cm of the mineral soil surface; or
b. 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; and
2. A mollic epipedon that has a texture finer than loamy fine sand and that is either:
a. 40 cm or more thick in a frigid temperature regime; or
b. 50 cm or more thick. Pachic Vertic Argiustolls
Soil Families and Soil Series in Subgroup

IGEI. Other Argiustolls 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 Argiustolls
Soil Families and Soil Series in Subgroup

IGEJ. Other Argiustolls 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 Argiustolls
Soil Families and Soil Series in Subgroup

IGEK. Other Argiustolls that have both:
1. When neither irrigated nor fallowed to store moisture, one of the following:
a. A frigid temperature regime and a moisture control section that in normal years is dry in all parts for fourtenths or more of the cumulative days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 5 oC; or
b. A mesic or thermic soil temperature regime and a moisture control section that in normal years is dry in some or all parts for six-tenths or more of the cumulative days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 5 oC; or
c. A hyperthermic, isomesic, or warmer iso soil temperature regime and a moisture control section that in normal years:
(1) Is moist in some or all parts for fewer than 90 consecutive days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 8 oC; and
(2) Is dry in some or all parts for six-tenths or more of the cumulative days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 5 oC; and
2. 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:
a. 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
b. A fine-earth fraction containing 30 percent or more particles 0.02 to 2.0 mm in diameter; and
(1) In the 0.02 to 2.0 mm fraction, 5 percent or more volcanic glass; and
(2) [(Al plus 1/2 Fe, percent extracted by ammonium oxalate) times 60] plus the volcanic glass (percent) is equal to 30 or more. Vitritorrandic Argiustolls
Soil Families and Soil Series in Subgroup

IGEL. Other Argiustolls 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 Argiustolls
Soil Families and Soil Series in Subgroup

IGEM. Other Argiustolls that have, in one or more horizons within 100 cm of the mineral soil surface, redox depletions with chroma of 2 or less and also aquic conditions for some time in normal years (or artificial drainage). Aquic Argiustolls
Soil Families and Soil Series in Subgroup

IGEN. Other Argiustolls 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 Argiustolls
Soil Families and Soil Series in Subgroup

IGEO. Other Argiustolls that have a mollic epipedon that has a texture finer than loamy fine sand and that is either:
1. 40 cm or more thick in a frigid temperature regime; or
2. 50 cm or more thick. Pachic Argiustolls
Soil Families and Soil Series in Subgroup

IGEP. Other Argiustolls that have either:
1. Above the argillic horizon, an albic horizon or a horizon that has color values too high for a mollic epipedon and chroma too high for an albic horizon; or
2. A glossic horizon, or interfingering of albic materials into the upper part of the argillic horizon, or skeletans of clean silt and sand covering 50 percent or more of the faces of peds in the upper 5 cm of the argillic horizon. Alfic Argiustolls
Soil Families and Soil Series in Subgroup

IGEQ. Other Argiustolls that have both:
1. A calcic horizon with its upper boundary within 100 cm of the mineral soil surface; and
2. When neither irrigated nor fallowed to store moisture, one of the following:
a. A frigid temperature regime and a moisture control section that in normal years is dry in all parts for fourtenths or more of the cumulative days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 5 oC; or
b. A mesic or thermic soil temperature regime and a moisture control section that in normal years is dry in some part for six-tenths or more of the cumulative days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 5 oC; or
c. A hyperthermic, isomesic, or warmer iso soil temperature regime and a moisture control section that in normal years:
(1) Is moist in some or all parts for fewer than 90 consecutive days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 8 oC; and
(2) Is dry in some part for six-tenths or more of the cumulative days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 5 oC. Calcidic Argiustolls
Soil Families and Soil Series in Subgroup

IGER. Other Argiustolls that, when neither irrigated nor fallowed to store moisture, have one of the following:
1. A frigid temperature regime and a moisture control section that in normal years is dry in all parts for four-tenths or more of the cumulative days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 5 oC; or
2. A mesic or thermic soil temperature regime and a moisture control section that in normal years is dry in some or all parts for six-tenths or more of the cumulative days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 5 oC; or
3. A hyperthermic, isomesic, or warmer iso soil temperature regime and a moisture control section that in normal years:
a. Is moist in some or all parts for fewer than 90 consecutive days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 8 oC; and
b. Is dry in some or all parts for six-tenths or more of the cumulative days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 5 oC. Aridic Argiustolls
Soil Families and Soil Series in Subgroup

IGES. Other Argiustolls that, when neither irrigated nor fallowed to store moisture, have either:
1. A mesic or thermic soil temperature regime and a moisture control section that in normal years is dry in some part for four-tenths or less of the cumulative days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 5 oC; or
2. A hyperthermic, isomesic, or warmer iso soil temperature regime and a moisture control section that in normal years is dry in some or all parts for fewer than 120 cumulative days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 8 oC. Udic Argiustolls
Soil Families and Soil Series in Subgroup

IGET. Other Argiustolls that have a brittle horizon that is within 100 cm of the mineral soil surface, is 15 cm or more thick, and has either some opal coatings or 20 percent or more (by volume) durinodes. Duric Argiustolls
Soil Families and Soil Series in Subgroup

IGEU. Other Argiustolls. Typic Argiustolls
Soil Families and Soil Series in Subgroup

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