Soil Series Atlas

Andisols

Soils formed in volcanic ash and similar material

050100150cm1 ft2 ft3 ft4 ftAbove the subsoilTopsoil and any leached layer0–20 cm · 0–8 inSubsoilFirst B horizon to the base of the solum20–105 cm · 8–41 inBelow the solumParent material or rock, to the mediandepth described105–152 cm · 41–60 in050100150cmAbove the subsoilTopsoil and any leachedlayer0–20 cm · 0–8 inSubsoilFirst B horizon to thebase of the solum20–105 cm · 8–41 inBelow the solumParent material orrock, to the mediandepth described105–152 cm · 41–60 in
The typical Andisols profile: a schematic drawn to scale from the medians of 889 official series descriptions. It is not a real pedon.

Soil order · 976 established series in the classification database

Andisols cover 20.47 million acres of mapped U.S. soils — 1.3% of all series acres, the 10th largest of the twelve orders — across 1,093 mapped series.

Median solum thickness in their typical pedons is 105 cm, with the first B horizon at 20 cm. Official descriptions of Andisols go down a median 152 cm.

Andisols among the twelve orders

Share of all acres mapped to a named series, with this order highlighted.

Mollisols 27.3% · Alfisols 17.3% · Entisols 12.3% · Ultisols 11.8% · Inceptisols 11.4% · Aridisols 9.7% · Spodosols 3.7% · Vertisols 2.7% · Histosols 1.9% · Andisols 1.3% · Gelisols 0.5% · Oxisols <0.1%

Guide: The twelve soil orders, measured

Largest Andisols series

Mapped acres in current SSURGO data, across all series in the order.

  1. Lapine689,156 acres689 k
  2. Akalura484,569 acres485 k
  3. Nevine305,392 acres305 k
  4. Limberjim301,961 acres302 k
  5. Narrow Cape255,933 acres256 k
  6. Shukash242,026 acres242 k
  7. Syrupcreek219,780 acres220 k
  8. McCarthy192,902 acres193 k
  9. Tokul187,859 acres188 k
  10. Koniag186,549 acres187 k

Andisols on this site

3 Andisols series profiled here, largest first, drawn at one depth scale.

  1. TokulAquic Vitrixerands · 1 state · state soil
  2. ThreebearOxyaquic Udivitrands · 1 state · state soil
  3. HiloAcrudoxic Hydrudands · 1 state · state soil