LOCATION HARLAN WY+CO
Established Series
Rev. PSD-KLS
05/2023
HARLAN SERIES
The Harlan series consists of deep or very deep, well drained soils on relict alluvial fans, terraces, strike valleys and valley side slopes. Harlan soils formed in alluvium, slope alluvium or colluvium derived from redbed shales and interbedded siltstone and sandstone. Slopes are 0 to 20 percent. Mean annual precipitation is about 380 mm and the mean annual air temperature is about 7 degrees C.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Aridic Argiustolls
TYPICAL PEDON: Harlan loam-rangeland. (Colors are for dry soil unless otherwise stated.)
A--0 to 13 cm; brown (7.5YR 5/3) loam, dark brown (7.5YR 3/3) moist; strong very fine granular structure; soft, very friable; neutral (pH 7.2); clear smooth boundary. (8 to 15 cm thick)
AB--13 to 20 cm; reddish brown (5YR 5/3) heavy loam, dark reddish brown (5YR 3/3) moist; moderate medium prismatic structure parting to moderate medium subangular blocky; hard, very friable; few thin clay films on faces of some peds; neutral (pH 7.2); clear smooth boundary. (8 to 10 cm thick)
Bt--20 to 51 cm; reddish brown (5YR 5/4) light clay loam, reddish brown (5YR 4/4) moist; strong medium prismatic structure parting to strong medium angular and subangular blocky; very hard, very friable; thin continuous clay films on faces of peds and in root channels and pores; slightly alkaline (pH 7.4); clear wavy boundary. (13 to 51 cm thick)
Btk--51 to 66 cm; light reddish brown (5YR 6/4) heavy loam, reddish brown (5YR 5/4) moist; moderate medium prismatic structure parting to moderate medium subangular blocky; hard, very friable; common thin clay films on some faces of peds and in some root channels; strongly effervescent, some visible secondary calcium carbonate occurring as concretions and in thin seams and streaks; moderately alkaline (pH 8.0); gradual wavy boundary. (0 to 25 cm thick)
Bk--66 to 152 cm; light reddish brown (5YR 6/4) loam, reddish brown (5YR 5/4) moist; massive; hard, very friable; strongly effervescent, visible secondary calcium carbonate occurring as concretions and in seams and streaks; moderately alkaline (pH 8.2);
TYPE LOCATION: Johnson County, Wyoming; NW1/4, SW1/4, sec. 35, T. 44 N., R. 83 W.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 8 to 12 degrees C
Mollic epipedon thickness - 15 to 50 cm
Depth to secondary calcium carbonate - 20 to 50 cm
Organic carbon content in the surface horizon - 0.8 to 3 percent and decreases uniformly with depth
Base saturation - 90 to 100 percent
Particle-size control section (weighted average):
Clay content - 18 to 35 percent
Sand content - 15 to 35 percent fine sand or coarser
Rock fragment content - 0 to 15 percent, but typically less than 5 percent
A horizon
Hue: 7.5YR or 5YR
Value: 4 or 5 dry, 2 or 3 moist
Chroma: 2 or 3
Reaction: pH 6.6 to 7.8
Bt horizon
Hue: 5YR or 2.5YR
Value: 5 or 6 dry, 3 through 5 moist
Chroma: 3 through 5
Texture: clay loam, loam
Reaction: pH 6.6 to 7.8
Btk horizon
Hue: 5YR or 2.5YR
Value: 5 or 6 dry, 3 through 5 moist
Chroma: 3 through 5
Texture: clay loam, loam
Calcium carbonate equivalent: 6 to 15 percent
Reaction: pH 7.9 to 9.0
Bk horizon
Hue: 5YR or 2.5YR
Value: 5 through 7 dry, 4 through 6 moist
Chroma: 2 through 6
Calcium carbonate equivalent: 6 to 20 percent, but when greater than 15 percent, the horizon is thin and discontinuous
Reaction: pH 7.9 to 9.0
COMPETING SERIES:
Ascalon (CO) - have hue of 7.5YR or yellower in the particle-size control section
Belfon (KS) - have hue of 7.5YR or yellower in the particle-size control section
Bresser (CO) - have hue of 7.5YR or yellower in the particle-size control section
Cedak (WY) - have hue of 7.5YR or yellower in the particle-size control section
Charkiln (NV) - have hue of 7.5YR or yellower in the particle-size control section
Corralgulch (CO) - have hue of 7.5YR or yellower in the particle-size control section
Critchell (CO) - do not have an accumulation of secondary calcium carbonate
Dagflat (UT) - do not have an accumulation of secondary calcium carbonate
Datil (NM) - have hue of 7.5YR or yellower in the particle-size control section
Featherlegs (NM) - have hue of 7.5YR or yellower in the particle-size control section
Forgan (OK) - have hue of 7.5YR or yellower in the particle-size control section
Hargreave (WY) - have hue of 7.5YR or yellower in the particle-size control section
Hemingford (NE) - have hue of 7.5YR or yellower in the particle-size control section
Hiarc (NM) - have hue of 7.5YR or yellower in the particle-size control section
Kirtley (WY) - are moderately deep to paralithic contact
Lavate (UT) - do not have an accumulation of secondary calcium carbonate
Loarc (NM) - have hue of 7.5YR or yellower in the particle-size control section
Moskee (WY) - have hue of 7.5YR or yellower in the particle-size control section
Noden (WY) - have hue of 7.5YR or yellower in the particle-size control section
Palmer Canyon (WY) - have hue of 7.5YR or yellower in the particle-size control section
Recluse (WY) - have hue of 7.5YR or yellower in the particle-size control section
Satanta (KS) - have hue of 7.5YR or yellower in the particle-size control section
Shalona (CO) - have hue of 7.5YR or yellower in the particle-size control section
Sitcan (CO) - have hue of 7.5YR or yellower in the particle-size control section
Sugardee (WY) - have more than 35 percent gravel in the lower part of the solum
Wages (CO) - have hue of 7.5YR or yellower in the particle-size control section
Wolf (WY) - have hue of 7.5YR or yellower in the particle-size control section
GEOGRAPHIC SETTING:
Landform - relict alluvial fans, terraces, strike valleys and valley side slopes
Elevation - 1,075 to 2,100 meters
Slopes - 0 to 20 percent
Parent material - alluvium, slope alluvium or colluvium derived from redbed shales and interbedded siltstone and sandstone
Mean annual air temperature - 7 to 9 degrees C
Mean annual precipitation - 305 to 480 mm
Precipitation pattern - peak periods precipitation occur during the spring and early summer
Frost-free period - 100 to 130 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderate permeability.
USE AND VEGETATION: Harlan soils are used principally as rangeland and wildlife habitat but may be tilled to irrigated or dryland crops in some areas. Principal native vegetation is blue grama, western wheatgrass, sagebrush, and cactus.
DISTRIBUTION AND EXTENT: Harlan soils are of moderate extent in north-central Wyoming, southwestern Colorado and along the eastern front of the Rocky Mountains in northcentral Colorado; MLRAs 36, 49 and 58B.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Johnson County (Southern Johnson Area), Wyoming; 1971.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - 0 to 20 (A and AB horizons)
Argillic horizon - 20 to 66 cm (Bt and Btk horizons)
Secondary calcium carbonate accumulation - 51 to 152 cm (Btk and Bk horizons)
Particle-size control section - 20 to 66 cm (Bt and Btk horizons)
Harlan soils have a mesic soil temperature regime and an ustic soil moisture regime bordering on aridic.
Converted to metric, formatting updated to current standards, competing series section updated. 05/2020
National Cooperative Soil Survey
U.S.A.