Soil Series Atlas

Forkwood soil series

Fine-loamy, mixed, superactive, mesic Ustic Haplargids

050100150cm1 ft2 ft3 ft4 ftATopsoil0–13 cm · 0–5 inBtSubsoil · clay build-up13–30 cm · 5–12 inBtkSubsoil · clay build-up, lime (carbonate)build-up30–51 cm · 12–20 inBkSubsoil · lime (carbonate) build-up51–76 cm · 20–30 inBCkSubsoil grading to parent material · lime(carbonate) build-up76–152 cm · 30–60 in050100150cmATopsoil0–13 cm · 0–5 inBtSubsoil · clay build-up13–30 cm · 5–12 inBtkSubsoil · claybuild-up, lime(carbonate) build-up30–51 cm · 12–20 inBkSubsoil · lime(carbonate) build-up51–76 cm · 20–30 inBCkSubsoil grading toparent material · lime(carbonate) build-up76–152 cm · 30–60 in
Typical pedon, to scale: 152 cm (60 in), 5 horizons.

Aridisols — soils of dry climates

Forkwood is mapped on 568,441 acres in 2 states, 461st nationally by area. It shares its full family classification with the larger Penistaja, but is described 26 cm less deep, reaches its subsoil 8 cm lower, and has its largest acreage in Wyoming instead of New Mexico. In Wyoming only four series cover more ground. It was established in 1980, later than all but two of the series here. It is the state soil of Wyoming.

Depth
Very deep
Drainage
Well drained
Water movement
Moderate

Compare with another seriesSimilar series in the finder

Where Forkwood is mapped

568,441 acres in 18 soil survey areas, from current SSURGO data.

Its family-mate Penistaja is larger overall, yet Forkwood covers more ground in Wyoming and Montana.

AlabamaArizonaColoradoFloridaGeorgiaIndianaKansasMaineMassachusettsMinnesotaNew JerseyNorth CarolinaNorth DakotaOklahomaPennsylvaniaSouth DakotaTexasWyoming: 568,411 acresConnecticutMissouriWest VirginiaIllinoisNew MexicoArkansasCaliforniaDelawareDistrict of ColumbiaIowaKentuckyMarylandMichiganMississippiMontana: 30 acresNew HampshireNew YorkOhioOregonTennesseeUtahVirginiaWashingtonWisconsinNebraskaSouth CarolinaIdahoNevadaVermontLouisianaRhode Island

Share of all Forkwood acres

  1. Wyoming100%
  2. Montana<0.1%
  • Rank in the state · share of its mapped soil
  • Wyoming 5th of 1,859 · 1.54%

In the field

Drainage

Well drained

Drains fastStays wet

Soil depth

Very deep

ShallowDeep

Permeability

Moderate

SlowFast
Parent material
Alluvium
Landform
Terraces, alluvial fans, hills, ridges/interfluves, pediments
Type location
Wyoming

How it is classified

Identical to Penistaja at every level.

Against other Aridisols

Forkwood makes up 0.37% of all mapped Aridisols — the 33rd largest of 2,777 series in the order.

Solum thickness (topsoil + subsoil)

152 cm over a median of 104 cm

Its relatives

31 established series share the family “Fine-loamy, mixed, superactive, mesic Ustic Haplargids”

By mapped acres Forkwood is 4th among them. Full family list

Close relatives, at one scale

  1. Forkwood152 cm · Ustic Haplargids
  2. Penistaja178 cm · Ustic Haplargids

Horizon by horizon

HorizonLayerDepthThickness
ATopsoil0–13 cm0–5 in13 cm
BtSubsoil: clay build-up13–30 cm5–12 in17 cm
BtkSubsoil: clay build-up, lime (carbonate) build-up30–51 cm12–20 in21 cm
BkSubsoil: lime (carbonate) build-up51–76 cm20–30 in25 cm
BCkSubsoil grading to parent material: lime (carbonate) build-up76–152 cm30–60 in76 cm

Sources: USDA–NRCS Official Series Description (revised 2002-10), Soil Classification database and SSURGO. Ranks computed by Soil Series Atlas. Method · Guides