LOCATION KAGUYAK                 AK

Established Series
Rev. CAP
06/2025

KAGUYAK SERIES

Depth class: Shallow
Drainage class: Well drained
Parent material: herbaceous organic material over gravelly medial silty volcanic ash over residuum weathered from graywacke
Landscape: Islands
Landscape: Islands
Landform: Mountains, hills, and ridges
Slopes: 0 to 80 percent
Mean annual precipitation: about 2250 mm (88.5 in)
Mean annual air temperature: about 2 degrees C. (34 degrees F.)

TAXONOMIC CLASS: Medial, ferrihydritic Lithic Humicryods

TYPICAL PEDON: Kaguyak very gravelly medial silt loam - on grass herbaceous at elevation of 185 meters (615 feet). (All colors are for moist soil unless noted.)

Oe--0 to 3 centimeters (0 to 1 inches); dark brown (7.5YR 3/2), brown (7.5YR 4/2), dry; moderately decomposed plant material; soft, very friable, nonsticky, nonplastic; many very fine, fine, and common medium roots throughout; extremely acid (pH 3.8); abrupt smooth boundary.

A--3 to 11 centimeters (1 to 4 inches); very dark grayish brown (10YR 3/2), dark grayish brown (10YR 4/2), dry; very gravelly medial silt loam; weak fine granular structure; soft, very friable, nonsticky, nonplastic; many very fine, fine, and common medium roots throughout; 40 percent gravel and 5 percent cobble; strongly acid (pH 5.4); clear wavy boundary.

Bw--11 to 43 centimeters (4 to 17 inches); dark yellowish brown (10YR 4/4), yellowish brown (10YR 5/4), dry; very gravelly medial silt loam; weak fine subangular blocky structure; soft, very friable, nonsticky, nonplastic; common fine roots throughout; 40 percent gravel and 5 percent cobble; strongly acid (pH 5.4); abrupt irregular boundary.

2R--43 to 68 centimeters (17 to 27 inches); strongly to indurated graywacke bedrock.

TYPE LOCATION: Kodiak Archipelago Soil Survey Area, Alaska; Latitude 56 degrees 51 minutes 33.00 seconds and Longitude 153 degrees 48 minutes 12.00 seconds west, UTM north 6301996.80 and UTM east 451015.66, zone 5, Datum WGS84.

RANGE IN CHARACTERISTICS:

Soil moisture regime: Udic
Mean annual soil temperature: 1.6 to 3.3 degrees C. (34.8 to 37.9 degrees F.)
Thickness of organic material: 0 to 10 cm (0 to 4 in)
Depth to andic properties: 0 to 10 cm (0 to 4 in)
Depth to cambic horizon: 5 to 23 cm (2 to 9 in)
Depth to lithic contact: 20 to 50 cm (8 to 20 in)

Oa, Oe, Oi horizon:
Hue: 7.5YR to 10 YR
Value: 2 to 5
Chroma: 1 to 4
Texture: slightly, moderately, or highly decomposed plant material
Organic matter: 60 to 90 percent
Reaction class: extremely acid to moderately acid (pH 3.5 to 6.0)

A horizon:
Hue: 5YR, 7.5YR, or 10YR
Value: 2 to 5
Chroma: 1 to 3
Texture: (medial) silt loam, silt, loam, or very fine sandy loam and their very or extremely gravelly analogues
Silt: 40 to 90 percent
Clay: 2 to 10 percent
Rock Fragments: 35 to 80 percent
Reaction Class: extremely acid to moderately acid (pH 3.5 to 6.0)

Bw horizon:
Hue: 5YR, 7.5YR, or 10YR
Value: 2 or 3
Chroma: 1 to 4
Texture: (medial) silt loam, silt, loam, or very fine sandy loam and their very or extremely gravelly analogues
Silt: 40 to 90 percent
Clay: 2 to 12 percent
Rock Fragments: 35 to 80 percent
Reaction Class: extremely acid to moderately acid (pH 3.5 to 6.0)

3R horizon: Strongly to indurated graywacke bedrock.

Some pedons have lithic contacts at depths greater than 50 cm (20 in) and/or skeletal till substratum above the lithic contact.

COMPETING SERIES: These are no competing series.

GEOGRAPHIC SETTING:
Elevation: 150 to 1300 meters (500 to 4300 feet)
Parent material: herbaceous organic material over gravelly medial silty volcanic ash over residuum weathered from graywacke
Landform: mountains, hills, and ridges
Slope: 0 to 80 percent
Mean annual temperature: -2 to 4 degrees C. (28 to 39 degrees F.)
Mean annual precipitation: 900 to 3000 mm (35 to 98 inches)
Frost free period: 20 to 50 days

GEOGRAPHICALLY ASSOCIATED SOILS: These include Akalura, Ayakulik, Bidarka, Kazakof, Spiridon, and Shuyak.
Akalura soils lack lithic contacts, have loamy skeletal till substratum, and occur on flanks, backslopes, and foot slopes.
Ayakulik soils have lithic contact greater than 50 cm (20 in), lack skeletal control sections, and occur are similar landform positions.
Bidarka soils have lithic contacts greater than 50 cm (20 in) and occur on similar landform positions.
Kazakof soils have are lithic contact at depths greater than 50 cm (20 in), and occur on similar landform positions.
Spiridon soils have lithic contacts greater than 50 cm (20 in), have loamy skeletal till substratum above the lithic contact, and occur on similar landform positions.
Shuyak soils lack skeletal particle-sized control sections and occur are similar landform positions.

DRAINAGE AND PERMEABILITY:
Drainage class: well drained
Saturated Hydraulic Conductivity: very high in the Oe horizon and moderately high to high in the A and Bw horizons, very low or low in the 2R.
Permeability: rapid to very rapid in the Oe horizon, moderately rapid to rapid in the A and B horizons., and impermeable to very slow in the 2R.
Runoff: high to very high.

USE AND VEGETATION:
Used for rangeland on slopes less than 45%. The native vegetation includes Sitka spruce, salmonberry, devils club, moss, alder, dwarf dogwood, Canada goldenrod, fireweed, tufted hairgrass, bluejoint grass, red fescue, and geraniums.

DISTRIBUTION AND EXTENT: MLRA 220 Alexander Archipelago-
Gulf of Alaska Coast and MLRA 225 Southern Alaska Peninsula Mountains.
Extent: extensive.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Wasilla, Alaska

SERIES ESTABLISHED: Kodiak Archipelago Soil Survey, Alaska, 1960.

REMARKS: Diagnostic features and horizons recognized in this profile include:

Organic material: 0 to 3 cm (0 to 1 in) (moderately decomposed hemic plant material) (Oe horizon)

Andic soil properties: 3 to 43 cm (1 to 17 in) (A, Bw horizons)

Cambic horizon: 11 to 43 cm (4 to 17 in) (Bw horizon)

Lithic contact: 43 to 68 cm (17 to 27) (2R horizon)

ADDITIONAL DATA:

User pedon Id: 10TD 04603

---

National Cooperative Soil Survey
U.S.A.