LOCATION DONNELLY                AK

Established Series
Rev. DKM/DLM
02/2022

DONNELLY SERIES

Depth class: very deep
Drainage class: somewhat excessively drained
Parent material: micaceous loess over sand and gravel
Landform: outwash plains, stream terraces, escarpments, and moraines
Slope: 0 to 70 percent
Mean annual precipitation is about 12 inches
Mean annual temperature is about 26 degrees F.

TAXONOMIC CLASS: Sandy-skeletal, mixed Typic Haplocryepts

TYPICAL PEDON: Donnelly silt loam - forested (All colors are for moist soil)

Oi--0 to 2 inches (0 to 6 cm); very dark brown (7.5YR 2.5/2) slightly decomposed plant material; many roots; strongly acid (5.2 pH); abrupt smooth boundary. (1 to 4 inches thick)

A--2 to 5 inches (6 to 12 cm); dark brown (7.5YR 3/3) silt loam; moderate medium granular structure; very friable, slightly sticky, slightly plastic; many roots; strongly acid (5.3 pH); clear smooth boundary. (0 to 4 inches thick)

Bw--5 to 10 inches (12 to 25 cm); 70 percent dark yellowish brown (10YR 4/6) and 30 percent brown (7.5YR 4/4) silt loam; moderate medium subangular blocky structure; friable, slightly sticky, slightly plastic; common fine and medium roots; moderately acid (5.6 pH); clear smooth boundary. (3 to 10 inches thick)

2BC--10 to 13 inches (25 to 33 cm); dark yellowish brown (10YR 4/6) very gravelly loamy sand; single grained; loose, nonsticky, nonplastic; few fine and medium roots; 40 percent gravel; moderately acid (5.6 pH); gradual smooth boundary. (0 to 8 inches thick)

2C--13 to 60 inches (33 to 152 cm); variegated very gravelly coarse sand; pebbles are rounded; single grained; loose, nonsticky, nonplastic; few fine roots; 50 percent gravel; slightly acid.

TYPE LOCATION: Goldstream-Nenana Area, Alaska; UTM zone 6, 391033E, 7125374N

RANGE IN CHARACTERISTICS:
Thickness of the loess mantle: 1 to 12 inches over very gravelly substratum
Solum: loess mantle, may extend into the gravelly materials, or mixing of the eolian and gravelly materials
Particle size control section: 15 to 70 percent rock fragments, weighted average greater than 35 percent rock fragments
Mean annual soil temperature: 32 to 35 degrees F.

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

A horizon: (where present)
Matrix color: hue of 7.5YR or 10YR, value of 2 to 3 and chroma of 2 or 3. Texture: silt loam modified by 0 to 40 percent total coarse fragments, 0 to 40 percent gravel and 0 to 15 percent cobbles
Reaction class: very strongly acid to moderately acid.

Bw horizon:
Matrix color: hue of 7.5YR or 10YR, value of 3 to 5 and chroma of 3 to 6. Texture: is silt loam modified by 0 to 40 percent total coarse fragments, 0 to 40 percent gravel, 0 to 15 percent cobble, and 0 to 5 percent stones
Reaction class: strongly acid to slightly acid

2BC horizon: (where present)
Matrix color: value of 4 or 5 and chroma of 3 to 6
Texture: silt loam, sandy loam, sand or loamy sand modified by 15 to 70 percent total coarse fragments, 15 to 70 percent gravel, 0 to 15 percent cobble, and 0 to 5 percent stones
Reaction class: strongly acid to neutral.

2C horizon:
Matrix color: variegated
Texture: coarse sand, sand or loamy sand modified by 35 to 90 percent total coarse fragments, 35 to 90 percent gravel and 0 to 30 percent cobble
Reaction class: moderately acid or slightly acid

COMPETING SERIES: These are the Como, Pippin, and Sinona series. Como soils have a sandy surface layer formed from granite and gneiss. Pippin and Sinona soils do not contain substantial mica.

GEOGRAPHIC SETTING:
Parent material: micaceous loess over sand and gravel
Landform: outwash plains, stream terraces, escarpments, fans and moraines
Slope: 0 to 70 percent
Climate: boreal continental, with short, warm summers and long, cold winters Mean annual precipitation: 10 to 14 inches, approximately one third of which falls as snow
Mean annual temperature: 21 to 28 degrees.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Nenana, Richardson and Volkmar. Nenana soils are on outwash plains and low moraines. They formed in a mantle of micaceous loess overlying sand and/or gravel. Richardson soils are in slight depressions on outwash plains and terraces the soils formed in loess more than 40 inches thick over a sand and/or gravel. Volkmar soils occupy slight depressions on outwash plains and terraces and are formed in a mantle of silty

DRAINAGE AND PERMEABILITY: Somewhat excessively drained. Slow runoff. Saturated hydraulic conductivity is moderately high in the solum and high is the substratum.

USE AND VEGETATION: Mostly in native white spruce, paper birch, and quaking aspen forest. A few areas have been used for small grains, hay, and pasture.

DISTRIBUTION AND EXTENT: MLRA 229, Interior Alaska Lowlands. The series is of moderate extent.

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

SERIES ESTABLISHED: Goldstream-Nenana Area, Alaska, 1973.

REMARKS: Diagnostic horizons and features recognized in this profile include:
Cambic horizon: 5 to 13 inches
Temperature regime: cryic
Particle size: sandy-skeletal from 10 to 40 inches.

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National Cooperative Soil Survey
U.S.A.