LOCATION PROGRESS                AK

Established Series
Rev. JDW/JPM/DLM
11/2022

PROGRESS SERIES

Depth class: very deep
Drainage class: well drained
Parent material: loess over alluvium or deposits reworked by wind
Landform: stream terraces, plains, terraces, or hills
Slopes range from 0 to 20 percent
Mean annual temperature: about 26 degrees F., -3.3 C.
Mean annual precipitation: about 12 inches, 305 mm

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

TYPICAL PEDON: Progress silt loam under forest vegetation. (All colors are for moist soil)

Oi--0 to 2 inches, (0 to 5 cm); black (10YR 2/1) forest litter; admixture of silt; many roots; strongly acid (pH 5.3); abrupt smooth boundary. (1 to 4 inches thick)

A--2 to 4 inches, (5 to 10 cm); brown (7.5YR 4/2) silt loam; weak very fine granular structure; very friable, nonsticky and nonplastic; common fine and medium roots; common mica flakes; slightly acid (pH 6.3); clear smooth boundary. (2 to 4 inches thick)

Bw--4 to 8 inches, (10 to 20 cm); dark yellowish brown (10YR 4/4) very fine sandy loam; weak thin platy structure; very friable, nonsticky and nonplastic; common medium distinct brown (7.5YR 4/4) mottles; common fine roots; common mica flakes; slightly acid (pH 6.5); clear smooth boundary. (3 to 16 inches thick)

BC--8 to 18 inches, (10 to 46 cm); gray (10YR 5/1) very fine sandy loam; weak thin platy structure; very friable, nonsticky and nonplastic; common medium distinct yellowish brown (10YR 5/4) mottles; few fine roots; common mica flakes; neutral (pH 6.8); gradual smooth boundary. (3 to 16 inches thick)

C--18 to 60 inches, (46 to 152 cm); grayish brown (2.5Y 5/2) stratified very fine sandy loam, loamy fine sand, and fine sandy loam; massive; very friable, nonsticky and nonplastic; common medium distinct yellowish brown (10YR 5/4) mottles; common mica flakes; neutral (pH 6.8).

TYPE LOCATION: North Star Area, Alaska; in the SE 1/4 of the NW 1/4 of Section 25., T.1N., R.4E., Fairbanks Meridian.

RANGE IN CHARACTERISTICS:
Thickness of the solum: 11 to 36 inches, 28 to 91 cm
Loess mantle mica Content: substantial but less than 25 percent by weight
Mean annual soil temperature: 32 to 34 degrees F., 0 to 1.1 C.
Reaction class: strongly acid to neutral in mineral soil

A horizon:
Matrix color: hue of 7.5YR or 10YR; value of 2 to 5; chroma of 2 to 4
Texture: silt loam, very fine sandy loam, and strata of fine sandy loam and loamy fine sand.

Bw horizons:
Matrix color: hue of 10YR or 2.5Y; value of 3 to 6; chroma of 1 to 6
Texture: silt loam, very fine sandy loam, and strata of fine sandy loam and loamy fine sand

BC or C horizons (where present)
Matrix color: hue of 10YR or 2.5Y; value of 3 to 5; and chroma of 1 to 4

COMPETING SERIES: These are the Eska, Ganhona, Kalambach, Mine, Sambrito, Southpaw, Steese, Tebay, and Tsana series. Eska, Ganhona, Southpaw, and Tsana soils lack visible mica in the solum. Kalambach soils have greater than 35 percent coarse fragments in the lower part of the control section. Mine soils lack stratified textures. Steese soils have bedrock within 20 to 40 inches. Sambrito soils have MAST greater than 37 degrees F. Tebay soils have sola less than 9 inches thick.

GEOGRAPHIC SETTING:
Parent material: loess over alluvium or fluvial deposits reworked by wind
Landform: stream terraces, plains, terraces, or hills
Slopes range from 0 to 20 percent
Climate: subarctic with long cold winters and short warm summers
Mean annual temperature: 24 to 28 degrees F., -4.4 to 2.2 C.
Mean annual precipitation: 10 to 14 inches, 254 to 356 mm

GEOGRAPHICALLY ASSOCIATED SOILS:

DRAINAGE AND PERMEABILITY: Well drained, runoff low to medium runoff, saturated hydraulic conductivity is moderately high to high

USE AND VEGETATION: Some areas are cleared and used for grasses. Progress soils have native vegetation of white spruce, paper birch, and quaking aspen.

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

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

SERIES ESTABLISHED: North Star Area, Alaska. 1990.

REMARKS: Diagnostic horizons and features recognized in this pedon include:
Ochric epipedon: 2 to 4 inches, 5 to 10 cm
Cambic horizon: 4 to 8 inches, 10 to 20 cm
Particle size control section (weighted average): coarse-loamy, 10 to 40 inches, 25 to 102 cm from mineral soil surface
Temperature regime: cryic
Moisture regime: udic

The name was changed because the previous name may have been offensive to some groups.

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National Cooperative Soil Survey
U.S.A.