LOCATION MISSAK AK

Tentative Series
Rev CAP
04/2024

MISSAK SERIES

Depth class: very deep
Drainage class: very poorly drained
Parent material: herbaceous organic material over glassy sandy and loamy volcanic ash over herbaceous organic material over sandy and gravelly till
Landscape: Islands
Landform: hills and plains in swales and depressions
Slopes: 0 to 7 percent
Mean annual precipitation: 2250 mm (88.5 in)
Mean annual temperature: about 4 degrees C. (39 degrees F.)
Frost-free season: 20 to 50 days

TAXONOMIC CLASS: Euic Fluvaquentic Cryosaprists

TYPICAL PEDON: Missak mucky peat - grass herbaceous depression at elevation 100 meters (330 feet). (All colors are for moist soil, unless otherwise noted.)

Oe--0 to 4 centimeters (0 to 2 inches); very dark grayish brown (10YR 3/2), dark grayish brown (10YR 4/2), dry; mucky peat; very friable, soft, nonsticky, nonplastic; common very fine, fine, and medium roots throughout; very strongly acid (pH 4.6); abrupt wavy boundary. (1 to 25 cm, 1 to 10 in thick)

C1--4 to 25 centimeters (2 to 10 inches); very pale brown (10YR 7/3), very pale brown (10YR 8/3), dry; ashy loamy very fine sand; massive; very friable, soft, nonsticky, nonplastic; many very fine, fine, common medium roots throughout; moderately acid (pH 5.6); clear wavy boundary.

C2--25 to 31 centimeters (10 to 12 inches); light gray (10YR 7/1) ashy fine sand; massive; single grain; loose, nonsticky, nonplastic; common very fine, fine, and medium roots throughout; strongly acid (pH 5.3); abrupt wavy boundary. (Combined thickness is 8 to 36 cm, 3 to 14 in thick)

2Oa--31 to 150 centimeters (12 to 59 inches); 80 percent dark brown (7.5YR 3/2) and 20 percent very dark gray (10YR 3/1) muck; very friable, soft, nonsticky, nonplastic; strongly acid (pH 5.1); abrupt irregular boundary. (82 to 119 cm, 32 to 47 in thick)

3C--150 to 200 centimeters (59 to 79 inches); very gravelly sandy loam; massive; very friable, slightly hard, nonsticky, nonplastic; 50 percent gravel and 5 percent cobbles; strongly acid (pH 5.3).

TYPE LOCATION: Kodiak Archipelago Soil Survey Area, Alaska; Latitude 57 degrees 42 minutes 12.00 seconds and Longitude 152 degrees 36 minutes 38.00 seconds west, UTM north 6395748.86 and UTM east 523209.75, 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: 1 to 25 cm (1 to 10 in)
Thickness of 1912 ash: 8 to 36 cm (3 to 14 in)
Depth to sapric materials: 9 to 61 cm (3 to 24 in)
Depth to gravelly till: 91 to 175 cm (36 to 69 in)
Depth to aquic conditions: 0 to 25 cm ( 0 to 10 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)

C horizon:
Hue: 7.5YR to 10 YR
Value: 2 to 5
Chroma: 1 to 4
Texture: (ashy and glassy) sand, loamy sand, loamy fine sand, very fine sandy loam, sandy loam, or silt loam
Sand: 30 to 90 percent
Clay: 2 to 8 percent
Silt: 10 to 55 percent
Reaction class: extremely acid to moderately acid (pH 3.5 to 6.0)

Oa 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)

Oe, Oi horizons, where present:
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)

3C horizon:
Hue: 7.5YR, 10YR, or 2.5Y
Value: 4 to 6
Chroma: 1 to 4
Texture: sandy loam, fine sandy loam, coarse sandy loam, loamy sand, loamy coarse sand, or their very or extremely gravelly analogues
Sand: 50 to 85 percent
Clay: 2 to 10 percent
Rock fragments: 35 to 80 percent
Reaction Class: extremely acid to slightly acid (pH 3.5 to 6.5)

Some pedons have medial silt loam horizons above the loamy-skeletal till substratum and/or sandy-skeletal outwash substratum.

COMPETING SERIES: These are the Anipash (WA), Chichantna (AK), Ghost (WA), Sinopah (MT), and Tyonek (AK) series.
Anipash soils lack recent glassy volcanic ash, have multiple strata of mineral and organic horizons, have annual precipitation less than 765 mm (30 in), and occur in depressions along moraine toeslopes.
Chichantna soils lack recent glassy volcanic ash, have multiple strata of mineral and organic horizons, have annual precipitation less than 765 mm (30 in), and occur in depressions on till plains.
Ghost soils lack recent glassy volcanic ash, have multiple strata of mineral and organic horizons, and occur in depressions and swales of terraces and cirques.
Sinopah soils lack recent glassy volcanic ash, have annual precipitation less than 750 mm (30 in), and occur in fens on glacial-valley floors.
Tyonek soils lack recent glassy volcanic ash, have multiple strata of mineral and organic horizons, have annual precipitation less than 765 mm (30 in), and occur in depressions along moraine toeslopes.

GEOGRAPHIC SETTING:
Elevation: 5 to 365 meters (15 to 1205 feet)
Parent material: herbaceous organic material over glassy sandy and loamy volcanic ash over herbaceous organic material over sandy and gravelly till
Landform: hills and plains in depressions, drainageways, and swales
Slope: 0 to 7 percent
Mean annual temperature: 0 to 6 degrees C. (32 to 43 degrees F.)
Mean annual precipitation: 1500 to 3000 mm (59 to 118 in)
Frost free period: 20 to 50 days

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Izhut, Kizhuyak, Kodiak, Olds, Pasagshak, Sa, Salonie, Tonki, and Yukuk series.
Izhut soils lack thick organic horizons, have spodic horizons, have aquic conditions greater than 25 cm (10 in), and occur on higher landform positions.
Kizhuyak soils lack thick organic horizons, have thick ashy and glassy volcanic horizons, and occur on similar landform positions.
Kodiak soils lack thick organic horizons, have spodic horizons, lack aquic conditions within 150 cm (60 in), and occur on upland landform positions.
Olds soils have histic epipedons over medial volcanic materials and skeletal till and occur in similar landform positions.
Pasagshak soils lack thick organic horizons, have sandy-skeletal control sections, lack aquic conditions less than 41 cm (16 in), and occur on slightly higher flood plains and drainageways.
Sa soils have hemic organic materials and occur on similar landform positions.
Salonie soils lack thick organic horizons, have sandy-skeletal control sections, and occur on slightly higher flood plains and drainageways.
Tonki soils lack thick organic horizons, have andic properties, and occur on slightly higher flood plains and drainageways.
Yukuk soils lack thick organic horizons, have andic properties, have sandy-skeletal control sections, and occur on slightly higher flood plains and drainageways.

DRAINAGE AND PERMEABILITY:
Drainage class: Very poorly drained
Saturated Hydraulic Conductivity: very high in the Oe horizon, moderately high to high in the C horizon, very high in the 2Oa horizon, and moderately high to very high in the 3C.
Permeability: rapid to very rapid in the Oe horizon, moderate to very rapid in the C horizon, rapid to very rapid in the 2Oa horizon, and moderate to very rapid 3C horizons.
Runoff: negligible to very low.
Ponding, duration, and depth: none to frequently with brief to very long and 0 to 61 cm (0 to 24 in).
Flooding and duration: none to frequently with brief to long.
Hydric Indicators: A2 Histic epipedon, A6 Organic bodies, and A8 Muck presence

USE AND VEGETATION:
The natural vegetation is dominantly sedges and water tolerant grasses. The principal use is grazing, but most areas are used only by wildlife.

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

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

SERIES ESTABLISHED: Kodiak Archipelago Soil Survey, Alaska, 2024.

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

Organic material: 0 to 4 cm (0 to 2 in) (moderately decomposed hemic plant material) (Oe horizon)

1912 volcanic glass (ashy) material: 4 to 31 cm (2 to 12 in) (C horizon)

Organic material: 31 to 150 cm (12 to 60 in) (highly decomposed hemic plant material) (Oa horizon)

Lithological discontinuity (Glacial till): 150 to 200 cm (60 to 79 in)

ADDITIONAL DATA:

User pedon Id: 07MM 18507

National Cooperative Soil Survey
U.S.A.