LOCATION CASTNOT                 AK

Established Series
Rev. MHC/JPM/DLM
02/2022

CASTNOT SERIES

Depth class: Very deep
Drainage class: well drained
Parent material: silty eolian deposits over gravelly colluvium and/or till
Landform: mountains
Slopes: 20 to 65 percent
Mean annual precipitation: about 33 inches
Mean annual temperature: about 25 degrees F. (-4 degrees C.)

TAXONOMIC CLASS:

TYPICAL PEDON: Castnot loam -- on a slope of 30 percent under shrub birch-bog blueberry. All colors are for moist soil unless noted)

Oi--0 to 2inches (0 to 5 cm); very dark brown (7.5YR 2.5/2) slightly decomposed plant material; many very fine and fine, many medium and many coarse roots; extremely acid (pH 3.9); clear wavy boundary.

A/E--2 to 5 inches (5 to 13 cm); very dark brown (7.5YR 2.5/2) (A, 70%) and dark grayish brown (10YR 4/2) (E, 30%) silt loam; weak thin platy structure; very friable, nonsticky and nonplastic; many very fine and fine, many medium and common coarse roots; 5 percent gravel; extremely acid (pH 4.4); abrupt wavy boundary.

2Bs--5 to 10 inches (13 to 25 cm); dark reddish brown (5YR 3/4) and brown (7.5YR 4/4) gravelly sandy loam; weak medium subangular blocky structure; very friable, nonsticky and nonplastic; common very fine and fine roots; 20 percent gravel, 5 percent cobbles; extremely acid (pH 4.4); gradual wavy boundary.

2BC--10 to 18 inches (25 to 46 cm); yellowish brown (10YR 5/4) very cobbly sandy loam; weak coarse subangular blocky structure; friable, nonsticky and nonplastic; common very fine and fine roots; 20 percent gravel, 15 percent cobbles; very strongly acid (pH 5.0); gradual wavy boundary.

2C1--18 to 26 inches (46 to 66 cm); brown (10YR 5/3) very gravelly loam; massive; friable, nonsticky and nonplastic; 25 percent gravel, 10 percent gravel; very strongly acid (pH 5.0); abrupt irregular boundary.

2C2--26 to 60 inches (66 to 152 cm); brown (10YR 5/3) very cobbly sandy loam; massive; friable, nonsticky and nonplastic; 20 percent gravel, 15 percent cobbles; very strongly acid (pH 5.0).

TYPE LOCATION: The Delta River Survey Area, Alaska; along the Delta River about 0.8 miles below Juneau Falls; UTM coordinates: Zone 6, Easting 554347, Northing 7006437

RANGE IN CHARACTERISTICS:
Soil moisture regime: Udic
Mean annual soil temperature: 27 to 30 degrees F (-1 to -2.5 degrees C)
Mean summer soil temperature: about 2.5 degrees C.
Depth to strongly contrasting textural stratification: 2 to 7 inches (5 to 18 cm)


Oi horizon:
Color - hue of 2.5YR to 10YR; value of 2 to 3; chroma of 1 to 4
Organic matter content - 65 to 90 percent
Reaction - ultra acid to very strongly acid

A/E horizon
Color - hue of 2.5YR to 10YR; value of 2 to 3; chroma of 1 to 3
Texture - silt loam, loam
Clay content - 0 to 10 percent
Silt content - 55 to 75 percent
Sand content - 15 to 35 percent
Organic matter content - 3 to 6 percent
Rock fragments - 0 to 5 percent subangular very strongly cemented gravel
Reaction - very strongly acid to strongly acid

2Bs horizon:
Color - hue of 5YR or 7.5YR; value of 3 or 4; chroma of 4 to 6
Texture - gravelly loam, gravelly sandy loam, or loam
Clay content - 0 to 20 percent
Silt content - 10 to 40 percent
Sand content - 50 to 80 percent
Organic matter content - 0 to 2 percent
Rock fragments - 5 to 25 percent subangular strongly cemented gravel; 0 to 10 percent subangular strongly cemented cobbles
Reaction - very strongly acid to moderately acid

2C horizon:
Color - hue of 10YR to 5Y; value of 3 or 4; chroma of 1 to 4
Texture - very cobbly loam, very gravelly loam, or very gravelly sandy loam
Clay content - 0 to 20 percent
Silt content - 10 to 40 percent
Sand content - 45 to 80 percent
Organic matter content - 0 to 0 percent
Rock fragments - 10 to 30 percent subangular strongly cemented gravel; 2 to 35 percent subangular strongly cemented cobbles
Reaction - very strongly acid to slightly acid

COMPETING SERIES: This is the Kuzitrin and Tigaraha series in the same family. Tigaraha soils are paramicaceous and both soils have a continental climate in the winter and a maritime climate in the summer, resulting in a mean summer soil temperature less than 2 degrees C.

GEOGRAPHIC SETTING:
Parent material: silty eolian deposits over gravelly colluvium and/or till
Landform: mountains
Slope: 20 to 65 percent
Mean annual temperature: 25 degrees F (-4 degrees C)
Mean annual precipitation: 28 to 37 inches (712 to 940 mm)

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Basaltlake, Minya, and Petrokov soils on similar landforms. Basaltlake soils contain more sand and are somewhat excessively drained. Minya soils have spodic horizons. Petrokov soils have mean summer soil temperatures above 40 degrees F. (5 degrees C.)

DRAINAGE AND PERMEABILITY: Well drained, high runoff. Saturated hydraulic conductivity is moderately high to high.

USE AND VEGETATION: Used for wildlife habitat and recreation. The native vegetation is shrub birch-bog blueberry.

DISTRIBUTION AND EXTENT: MLRA 228, Interior Alaska Mountains, Alaska. The series is of small extent.

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

SERIES ESTABLISHED: The Delta River Area, Alaska, 2005

REMARKS: Diagnostic features and horizons recognized in this profile include:
Diagnostic horizons: cambic (thin spodic) from 5 to 10 inches
Temperature regime: cryic with MSST less than 40 degrees F.
Moisture regime: Udic

ADDITIONAL DATA:

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National Cooperative Soil Survey
U.S.A.