University of Idaho College of Agricultural and Life Sciences Plant, Soil & Entomological Sciences Soil & Land Resources
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Andisols

(Photo from the SSSA Marbut Memorial Slide Set)
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example 2

hydrous, amorphic, isothermic Acrudoxic Hydrudand

In the upper 250 cm of this soil, alternating A and B horizons have formed as a result of ash falls and intermittent soil development cycles. White specks in the C horizon are gibbsite (Al[OH]3) coatings. The 15-bar H2O content ranges from 102-211% in this soil. These soils have very low cation exchange capacity, <2.0 cmol(+)/kg.
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  Examples:
1. Hydrudand landscape
Hawaii
2. Acrudoxic Hydrudand
3. Melanudand landscape
Costa Rica
4. Melanudand
Costa Rica
5. Vitrixerand landscape
northern Idaho
6. Volcanic ash
Mt. Mazama Oregon
7. Typic Vitrixerand
northern Idaho
8. eroded Cryand landscape
Iceland
9. Cryand
Iceland
If you have any comments, suggestions, or questions about the 12 Soil Orders web site,
please contact Dr. Paul McDaniel  at the Soil Science Division,
University of Idaho, Moscow, ID 83844-2339.