IFF.Haploxerolls

Key to Subgroups

IFFA. Haploxerolls that have both:
1. A lithic contact within 50 cm of the mineral soil surface; and
2. A base saturation (by sum of cations) of 75 percent or less in one or more horizons between either the mineral soil surface or an Ap horizon, whichever is deeper, and the lithic contact. Lithic Ultic Haploxerolls
Soil Families and Soil Series in Subgroup

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

IFFC. Other Haploxerolls that have both:
1. An aridic moisture regime; 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. Torrertic Haploxerolls
Soil Families and Soil Series in Subgroup

IFFD. Other Haploxerolls 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 Haploxerolls
Soil Families and Soil Series in Subgroup

IFFE. Other Haploxerolls 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 Haploxerolls
Soil Families and Soil Series in Subgroup

IFFF. Other Haploxerolls that have both:
1. An aridic moisture regime; 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 Haploxerolls
Soil Families and Soil Series in Subgroup

IFFG. Other Haploxerolls 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 Haploxerolls
Soil Families and Soil Series in Subgroup

IFFH. Other Haploxerolls that have:
1. A mollic epipedon that is 50 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 75 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 Cumulic Haploxerolls
Soil Families and Soil Series in Subgroup

IFFI. Other Haploxerolls that have:
1. A mollic epipedon that is 50 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. A base saturation (by sum of cations) of 75 percent or less in one or more horizons between either an Ap horizon or a depth of 25 cm from the mineral soil surface, whichever is deeper, and either a depth of 75 cm or a densic, lithic, or paralithic contact, whichever is shallower. Cumulic Ultic Haploxerolls
Soil Families and Soil Series in Subgroup

IFFJ. Other Haploxerolls that have:
1. A mollic epipedon that is 50 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 Haploxerolls
Soil Families and Soil Series in Subgroup

IFFK. Other Haploxerolls that have both:
1. In one or more horizons within 75 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); and
2. A slope of less than 25 percent; and either
a. An organic-carbon content of 0.3 percent or more in all horizons within 125 cm of 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. Fluvaquentic Haploxerolls
Soil Families and Soil Series in Subgroup

IFFL. Other Haploxerolls that have both:
1. In one or more horizons within 75 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); and
2. A horizon, 15 cm or more thick within 100 cm of the mineral soil surface, that either has 20 percent or more (by volume) durinodes or is brittle and has a firm ruptureresistance class when moist. Aquic Duric Haploxerolls
Soil Families and Soil Series in Subgroup

IFFM. Other Haploxerolls that have both:
1. In one or more horizons within 75 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); and
2. A base saturation (by sum of cations) of 75 percent or less in one or more horizons between either an Ap horizon or a depth of 25 cm from the mineral soil surface, whichever is deeper, and either a depth of 75 cm or a densic, lithic, or paralithic contact, whichever is shallower. Aquultic Haploxerolls
Soil Families and Soil Series in Subgroup

IFFN. Other Haploxerolls that have, in one or more horizons within 75 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 Haploxerolls
Soil Families and Soil Series in Subgroup

IFFO. Other Haploxerolls 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 Haploxerolls
Soil Families and Soil Series in Subgroup

IFFP. Other Haploxerolls that have both:
1. A mollic epipedon that is 50 cm or more thick and has a texture finer than loamy fine sand; and
2. A calcic horizon or identifiable secondary carbonates within one of the following particle-size class (by weighted average in the particle-size control section) and depth combinations:
a. Sandy or sandy-skeletal and within 150 cm of the mineral soil surface; or
b. Clayey, clayey-skeletal, fine, or very-fine and within 90 cm of the mineral soil surface; or
c. Any other class and within 110 cm of the mineral soil surface. Calcic Pachic Haploxerolls
Soil Families and Soil Series in Subgroup

IFFQ. Other Haploxerolls that have both:
1. A mollic epipedon that is 50 cm or more thick and has a texture finer than loamy fine sand; and
2. A base saturation (by sum of cations) of 75 percent or less in one or more horizons between either an Ap horizon or a depth of 25 cm from the mineral soil surface, whichever is deeper, and either a depth of 75 cm or a densic, lithic, or paralithic contact, whichever is shallower. Pachic Ultic Haploxerolls
Soil Families and Soil Series in Subgroup

IFFR. Other Haploxerolls that have a mollic epipedon that is 50 cm or more thick and has a texture finer than loamy fine sand. Pachic Haploxerolls
Soil Families and Soil Series in Subgroup

IFFS. Other Haploxerolls that have:
1. An aridic moisture regime; and
2. A slope of less than 25 percent; and either 
a. An organic-carbon content of 0.3 percent or more in all horizons within 125 cm of 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. Torrifluventic Haploxerolls
Soil Families and Soil Series in Subgroup

IFFT. Other Haploxerolls that have both:
1. An aridic moisture regime; and
2. A horizon within 100 cm of the mineral soil surface that is 15 cm or more thick and either has 20 percent or more (by volume) durinodes or is brittle and has a firm ruptureresistance class when moist. Duridic Haploxerolls
Soil Families and Soil Series in Subgroup

IFFU. Other Haploxerolls that have both:
1. An aridic moisture regime; and
2. A calcic horizon or identifiable secondary carbonates within one of the following particle-size class (by weighted average in the particle-size control section) and depth combinations:
a. Sandy or sandy-skeletal and within 150 cm of the mineral soil surface; or
b. Clayey, clayey-skeletal, fine, or very-fine and within 90 cm of the mineral soil surface; or
c. Any other class and within 110 cm of the mineral soil surface. Calcidic Haploxerolls
Soil Families and Soil Series in Subgroup

IFFV. Other Haploxerolls that have both:
1. An aridic moisture regime; and
2. A sandy particle-size class in all horizons within 100 cm of the mineral soil surface. Torripsammentic Haploxerolls
Soil Families and Soil Series in Subgroup

IFFW. Other Haploxerolls that:
1. Have an aridic moisture regime; and
2. Either:
a. Do not have a cambic horizon and do not, in any part of the mollic epipedon below 25 cm from the mineral soil surface, meet all of the requirements for a cambic horizon except color; or
b. Have free carbonates throughout the cambic horizon or in all parts of the mollic epipedon below a depth of 25 cm from the mineral soil surface. Torriorthentic Haploxerolls
Soil Families and Soil Series in Subgroup

IFFX. Other Haploxerolls that have an aridic moisture regime. Aridic Haploxerolls
Soil Families and Soil Series in Subgroup

IFFY. Other Haploxerolls that have a horizon within 100 cm of the mineral soil surface that is 15 cm or more thick and either has 20 percent or more (by volume) durinodes or is brittle and has a firm rupture-resistance class when moist. Duric Haploxerolls
Soil Families and Soil Series in Subgroup

IFFZ. Other Haploxerolls that have a sandy particle-size class in all horizons within 100 cm of the mineral soil surface. Psammentic Haploxerolls
Soil Families and Soil Series in Subgroup

IFFZa. Other Haploxerolls that have a slope of less than 25 percent; and either
1. An organic-carbon content of 0.3 percent or more in all horizons within 125 cm of 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 Haploxerolls
Soil Families and Soil Series in Subgroup

IFFZb. Other Haploxerolls that have a mollic epipedon that has granular structure and that has, below any Ap horizon, 50 percent or more (by volume) wormholes, wormcasts, or filled animal burrows. Vermic Haploxerolls
Soil Families and Soil Series in Subgroup

IFFZc. Other Haploxerolls that have a calcic horizon or identifiable secondary carbonates within one of the following particle-size class (by weighted average in the particle-size control section) and depth combinations:
1. Sandy or sandy-skeletal and within 150 cm of the mineral soil surface; or
2. Clayey, clayey-skeletal, fine, or very-fine and within 90 cm of the mineral soil surface; or
3. Any other class and within 110 cm of the mineral soil surface. Calcic Haploxerolls
Soil Families and Soil Series in Subgroup

IFFZd. Other Haploxerolls that:
1. Do not have a cambic horizon and do not, in the lower part of the mollic epipedon, meet all of the requirements for a cambic horizon except color; and
2. Have a base saturation (by sum of cations) of 75 percent or less in one or more horizons between either an Ap horizon or a depth of 25 cm from the mineral soil surface, whichever is deeper, and either a depth of 75 cm or a densic, lithic, or paralithic contact, whichever is shallower. Entic Ultic Haploxerolls
Soil Families and Soil Series in Subgroup

IFFZe. Other Haploxerolls that have a base saturation (by sum of cations) of 75 percent or less in one or more horizons between either an Ap horizon or a depth of 25 cm from the mineral soil surface, whichever is deeper, and either a depth of 75 cm or a densic, lithic, or paralithic contact, whichever is shallower. Ultic Haploxerolls
Soil Families and Soil Series in Subgroup

IFFZf. Other Haploxerolls that either:
1. Do not have a cambic horizon and do not, in any part of the mollic epipedon below 25 cm from the mineral soil surface, meet all of the requirements for a cambic horizon except color; or
2. Have free carbonates throughout the cambic horizon or in all parts of the mollic epipedon below a depth of 25 cm from the mineral soil surface. Entic Haploxerolls
Soil Families and Soil Series in Subgroup

IFFZg. Other Haploxerolls. Typic Haploxerolls
Soil Families and Soil Series in Subgroup

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