Order:
Suborder:
[ ]
| Code |
Name |
Description |
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Xerolls that have a duripan within 100 cm of the mineral soil surface. |
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Other Xerolls that have a natric horizon. |
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Other Xerolls that have either:
- A petrocalcic horizon that has its upper boundary within 150 cm of the mineral soil surface; or
- An argillic horizon that has one or both of the following:
- With increasing depth, no clay decrease of 20 percent or more (relative) from the maximum clay content (noncarbonate clay) within 150 cm of the mineral soil surface (and there is no densic, lithic, or paralithic contact within that depth); and either
- Hue of 7.5YR or redder and chroma of 5 or more in the matrix; or
- Common redox concentrations with hue
of 7.5YR or redder or chroma of 6 or more, or both;
or
- A clayey or clayey-skeletal particle-size class in its upper part and, at its upper boundary, a clay increase either of 20 percent or more (absolute) within a vertical distance of 7.5 cm or of 15 percent or more (absolute) within a vertical distance of 2.5 cm, in the fine-earth fraction (and there is no densic, lithic, or paralithic contact within 50 cm of the mineral soil surface).
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Other Xerolls that:
- Have a calcic or gypsic horizon that has its upper boundary within 150 cm of the mineral soil surface; and
- In all parts above the calcic or gypsic horizon, after the surface soil has been mixed to a depth of 18 cm, either are calcareous or have a texture of loamy fine sand or coarser.
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Other Xerolls that have an argillic horizon. |
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Other Xerolls. |
Source:
Keys to Soil Taxonomy, Eighth Edition. 1998.
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