LOCATION TOGHOTTHELE AK

Established Series
Rev. DKM/DLM
02/2022

TOGHOTTHELE SERIES

Depth class: very deep
Drainage class: well drained
Parent material: loess over eolian sand
Landform: climbing dunes on back slopes of hills adjacent to flood plains
Slopes: 36 to 86 percent
Mean annual precipitation: about 11 inches, 280 mm
Mean annual temperature: about 25 degrees F., -4 degrees C.

TAXONOMIC CLASS: Coarse-silty, mixed, superactive Typic Haplocryepts

TYPICAL PEDON: TOGHOTTHELE silt loam - on a slope of 70 percent under white spruce and aspen forest at 625 feet elevation. (All colors are for moist soil unless noted)

Oi--0 to 2 inches, (0 to 6 cm); very dark brown (10YR 2/2); slightly decomposed plant material; many very fine to coarse roots; slightly acid (pH 6.5); abrupt wavy boundary. (1 to 3 inches thick)

A--2 to 7 inches, (6 to 18 cm); dark brown (10YR 3/3); silt loam; weak fine granular; very friable, slightly sticky, slightly plastic; many very fine to coarse roots; neutral (pH 6.7); clear wavy boundary. (2 to 7 inches thick)

Bw1--7 to 11 inches, (18 to 28 cm); dark yellowish brown (10YR 4/4); silt loam; moderate medium subangular blocky structure part to weak medium platy; very friable, slightly sticky, slightly plastic; many very fine and fine and common medium and coarse roots; slightly acid (pH 6.3); clear wavy boundary.

Bw2--11 to 28 inches, (28 to 72 cm); light olive brown (2.5Y 5/6); silt loam; moderate medium subangular blocky structure parting to weak medium platy; very friable, slightly sticky, slightly plastic; common very fine to medium roots; slightly acid (pH 6.5); gradual smooth boundary. (combined thickness of the Bw is 8 to 22 inches thick)

BC--28 to 51 inches, (72 to 130 cm); olive brown (2.5Y 4/4); silt loam; weak medium subangular blocky structure; very friable, slightly sticky, slightly plastic; few very fine and fine roots; neutral (pH 6.6); gradual smooth boundary. (78 to 168 inches thick)

2C--51 to 72 inches, (130 to 183 cm); dark grayish brown(2.5Y4/2); fine sand; massive; loose, nonsticky, nonplastic; strongly effervescent; moderately alkaline (pH 8.0)

TYPE LOCATION: Greater Nenana Area, Alaska; about 11 miles southwest of Fairbanks; in the NW 1/4 of the SW 1/4, section 10, T. 2 S., R. 3 W.; Fairbanks (D-3) SE 1:25,000 quad; Fairbanks Meridian; UTM north 7181173 and UTM east 445968, zone 6.

RANGE IN CHARACTERISTICS:

Particle-size control (section weighted average):
Percent clay in the control section: 3 to 14 percent

Soil moisture regime: udic
Mean annual soil temperature: 26 degrees F., 50 cm
Thickness of organic materials: 1 to 3 inches, 2 to 8 cm
Texture of the loess mantle: silt loam or silt
Texture of the eolian sand substratum: loamy sand, loamy fine sand, fine sand, sand
Percent clay in the loess mantle: 3 to 14 percent
Percent clay in the eolian sand substratum: 0.2 to 0.4 percent
Thickness of ochric epipedon 2 to 7 inches, 5 to 18 cm
Thickness of cambic horizon 8 to 22 inches, 22 to 56 cm
Depth to eolian sand: 31 to 63 inches, 80 to 160 cm

O horizon:
Matrix color: hue of 7.5YR to 10YR; value of 2 to 3; chroma of 1 to 3
Texture: slightly or moderately decomposed plant material
Reaction class: slightly acid or neutral

A horizon:
Matrix color: hue of 7.5YR or 10YR; value of 2 or 3; chroma of 1 or 3
Texture: silt loam or silt
Reaction class: slightly acid or neutral

Bw horizon:
Matrix color: hue of 7.5YR or 10YR; value of 3 or 4; chroma of 3 to 6
Texture: silt loam or silt
Reaction class: slightly acid or neutral

C or BC horizon:
Matrix color: hue of 7.5YR or 10YR; value of 4 or 5; chroma of 3 to 6
Texture: silt loam or silt
Reaction class: slightly alkaline or moderately alkaline

2C horizon:
Matrix color: hue of 10YR to 2.5Y; value of 4 or 5; chroma of 1 to 3
Texture: fine sand, sand
Effervescence: slightly or strongly
Reaction class: slightly alkaline or moderately alkaline

COMPETING SERIES: These are the Bodenburg, Fairbanks, Fairless, Koyukuk, Nunaniq series. Bodenburg and Koyukuk series lack finely disseminated calcium carbonate in the subsoil. Fairbanks, Fairless, and Nunaniq soils lack sandy subsoils.

GEOGRAPHIC SETTING:
Parent material: loess over eolian sand
Landform: climbing dunes on back slopes of hills adjacent to flood plains
Slopes: 36 to 86 percent
Mean annual temperature: about 25 degrees F., -4 degrees C.
Mean annual precipitation: about 11 inches, 280 mm

GEOGRAPHICALLY ASSOCIATED SOILS: These include the Eielson and Fairbanks series. Eielson soils are on floodplains and are moderately well drained.. Fairbanks soils are on hills and mountains and lack sandy suboils.

DRAINAGE AND PERMEABILITY: well drained, high runoff, saturated hydraulic conductivity moderate in the loess mantle and rapid in the eolian sand substratum.

USE AND VEGETATION: Used for recreation and wildlife habitat. The native vegetation includes white spruce and aspen forest.

DISTRIBUTION AND EXTENT: MLRA 231, Interior Alaska Highlands, The series is of limited extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA

SERIES ESTABLISHED: Greater Nenana Area, Alaska, 2007

REMARKS: Diagnostic features and horizons recognized in this profile include:
Ochric epipedon: from 2 to 7 inches, 6 to 18 cm.
Cambic horizon: from 7 to 28 inches, 12 to 59 cm.
Effervescence with dilute hydrochloric acid: from 51 to 72 inches, 130 to 183 cm.
Temperature regime: cryic 25 F., -4 C.
Moisture regime: udic

ADDITIONAL DATA:

ADDITIONAL DATA: National Soil Survey Laboratory data S06AK-240-00? from Southeast Fairbanks Borough, Alaska, samples by SSL Lincoln, NE, 07/2006

National Cooperative Soil Survey
U.S.A.