Soil Series Atlas

Tokul soil series

Medial, amorphic, mesic Aquic Vitrixerands

050100150cm1 ft2 ft3 ft4 ft5 ftOiOrganic layer · slightly decomposed0–3 cm · 0–1 inOaOrganic layer · highly decomposed3–5 cm · 1–2 inATopsoil5–15 cm · 2–6 inBs1Subsoil · iron and aluminum build-up15–23 cm · 6–9 inBs2Subsoil · iron and aluminum build-up23–43 cm · 9–17 inBs3Subsoil · iron and aluminum build-up43–61 cm · 17–24 inBCSubsoil grading to parent material61–84 cm · 24–33 in2BsmSubsoil · iron and aluminum build-up,cemented, different parent material84–157 cm · 33–62 in050100150cmOiOrganic layer ·slightly decomposed0–3 cm · 0–1 inOaOrganic layer · highlydecomposed3–5 cm · 1–2 inATopsoil5–15 cm · 2–6 inBs1Subsoil · iron andaluminum build-up15–23 cm · 6–9 inBs2Subsoil · iron andaluminum build-up23–43 cm · 9–17 inBs3Subsoil · iron andaluminum build-up43–61 cm · 17–24 inBCSubsoil grading toparent material61–84 cm · 24–33 in2BsmSubsoil · iron andaluminum build-up,cemented, differentparent material84–157 cm · 33–62 in
Typical pedon, to scale: 157 cm (62 in), 8 horizons.

Andisols — soils formed in volcanic ash and similar material

Nationally Tokul is a small series: 187,859 acres, 1,939th of 24,791 by area. It is the only series in the atlas that falls in the medial particle-size class. Every mapped acre is in Washington. No other established series shares its family class. It is the state soil of Washington.

Depth
Moderately deep
Drainage
Moderately well drained
Water movement
Moderately low

Compare with another seriesSimilar series in the finder

Where Tokul is mapped

187,859 acres in 4 soil survey areas, from current SSURGO data.

AlabamaArizonaColoradoFloridaGeorgiaIndianaKansasMaineMassachusettsMinnesotaNew JerseyNorth CarolinaNorth DakotaOklahomaPennsylvaniaSouth DakotaTexasWyomingConnecticutMissouriWest VirginiaIllinoisNew MexicoArkansasCaliforniaDelawareDistrict of ColumbiaIowaKentuckyMarylandMichiganMississippiMontanaNew HampshireNew YorkOhioOregonTennesseeUtahVirginiaWashington: 187,859 acresWisconsinNebraskaSouth CarolinaIdahoNevadaVermontLouisianaRhode Island

Share of all Tokul acres

  1. Washington100%
  • Rank in the state · share of its mapped soil
  • Washington 17th of 1,770 · 0.58%

In the field

Drainage

Moderately well drained

Drains fastStays wet

Soil depth

Moderately deep

ShallowDeep

Water movement (Ksat)

Moderately low

SlowFast

Blount and Crete also have moderately low Ksat.

Parent material
Loess, volcanic ash/tephra, glacial till
Landform
Till plains, hills
Type location
Washington

How it is classified

  1. OrderAndisols
  2. SuborderXerands
  3. Great groupVitrixerands
  4. SubgroupAquic Vitrixerands
  5. FamilyMedial, amorphic, mesic Aquic Vitrixerandsmedial particle-size classamorphic mineralogy classmesic soil temperature regime

Against other Andisols

Tokul makes up 0.92% of all mapped Andisols — the 9th largest of 1,093 series in the order.

Solum thickness (topsoil + subsoil)

157 cm over a median of 105 cm

Depth to the subsoil

15 cm under a median of 20 cm

Depth described

157 cm over a median of 152 cm

Its relatives

Other Andisols in this atlas

  1. Tokul157 cm · Aquic Vitrixerands
  2. Threebear175 cm · Oxyaquic Udivitrands
  3. Hilo150 cm · Acrudoxic Hydrudands

Horizon by horizon

HorizonLayerDepthThickness
OiOrganic layer: slightly decomposed0–3 cm0–1 in3 cm
OaOrganic layer: highly decomposed3–5 cm1–2 in2 cm
ATopsoil5–15 cm2–6 in10 cm
Bs1Subsoil: iron and aluminum build-up15–23 cm6–9 in8 cm
Bs2Subsoil: iron and aluminum build-up23–43 cm9–17 in20 cm
Bs3Subsoil: iron and aluminum build-up43–61 cm17–24 in18 cm
BCSubsoil grading to parent material61–84 cm24–33 in23 cm
2BsmSubsoil: iron and aluminum build-up, cemented, different parent material84–157 cm33–62 in73 cm

Sources: USDA–NRCS Official Series Description (revised 2017-05), Soil Classification database and SSURGO. Ranks computed by Soil Series Atlas. Method · Guides