LOCATION LANSWICK COEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Cumulic Haplocryolls
TYPICAL PEDON: Lanswick loam, on a north-facing, 2 percent slope in an area of rangeland. (Colors are for dry soil unless otherwise noted. When described on November 21, 1990, the soil was slightly moist throughout.)
A1--0 to 5 inches; brown (10YR 5/3) loam, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; soft, very friable, moderately sticky and moderately plastic; many very fine roots; few very fine continuous tubular pores; 10 percent gravel; neutral (pH 6.8); abrupt smooth boundary. (4 to 12 inches thick)
A2--5 to 13 inches; brown (10YR 5/3) loam, very dark grayish brown (10YR 3/2) moist; weak fine subangular blocky structure; soft, very friable, moderately sticky and moderately plastic; common very fine roots; few very fine continuous tubular pores; 10 percent gravel; neutral (pH 6.8); abrupt smooth boundary. (5 to 20 inches thick)
A3--13 to 23 inches; grayish brown (10YR 5/2) sandy loam, very dark gray (10YR 3/1) moist; massive; soft, very friable, slightly sticky and slightly plastic; few very fine roots; few very fine continuous tubular pores; 10 percent gravel; neutral (pH 7.2); abrupt smooth boundary. (0 to 12 inches thick)
Bw--23 to 33 inches; pale brown (10YR 6/3) sandy loam, dark brown (10YR 3/3) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; few very fine continuous tubular pores; 10 percent gravel; slightly alkaline (pH 7.4); abrupt smooth boundary. (0 to 12 inches thick)
Bk1--33 to 43 inches; light yellowish brown (10YR 6/4) loam, brown (10YR 5/3) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; common very fine continuous tubular pores; 10 percent gravel; common large soft masses and fine filaments of secondary calcium carbonate; slightly effervescent; slightly alkaline (pH 7.4); abrupt smooth boundary. (10 to 45 inches thick)
Bk2--43 to 60 inches; pale brown (10YR 6/3) stratified loam and loamy coarse sand, brown (10YR 5/3) moist; massive, hard, friable, slightly sticky and slightly plastic; few very fine roots; many very fine and few fine continuous tubular pores; 10 percent gravel; common fine filaments of secondary calcium carbonate and lining pores; slightly effervescent; slightly alkaline (pH 7.6). (0 to 30 inches thick)
TYPE LOCATION: Park County, Colorado; about 8 miles southeast of Hartsel, about 1,900 feet north and 250 feet west of the southeast corner of Sec. 7, T. 13 S., R. 74 W; U.S.G.S. Guffey NW topographic quad.; Lat. 38 degrees, 55 minutes, 52 seconds N.; Long. 105 degrees, 42 minutes, 14 seconds W.
RANGE IN CHARACTERISTICS:
Soil moisture: The soil moisture control section is usually dry in late spring and early summer, moist in some part in late July and August, and intermittently dry in fall; ustic regime bordering on aridic.
Mean annual soil temperature: 36 to 42 degrees F.
Mean summer soil temperature is 55 to 58 degrees F.
Thickness of mollic epipedon: 16 to 50 inches
Depth to secondary calcium carbonate: 25 to 45 inches
Particle-size control section (weighted averages):
Clay content:18 to 30 percent
Sand content: 25 to 55 percent
Rock fragment content: 0 to 15 percent
A horizon:
Hue: 10YR, 7.5YR
Value: 2 to 5 dry; 2 or 3 moist
Chroma: 1 to 3 dry; 1 or 2 moist
Texture: loam, fine sandy loam, sandy loam, clay loam, sandy clay loam
Clay content: 14 to 35 percent
Gravel content: 0 to 15 percent, indurated
Reaction: neutral to moderately alkaline
Bw horizon:
Hue: 10YR, 7.5YR
Value: 4 to 7 dry; 2 to 5 moist
Chroma: 1 to 3 dry; 1 to 3 moist
Texture: loam, clay loam, sandy loam, sandy clay loam
Clay content: 18 to 35 percent
Gravel content: 5 to 15 percent, indurated
Reaction: neutral or slightly alkaline (pH 6.6-7.8)
Bk horizon:
Hue: 10YR, 7.5YR, 2.5YR
Value: 4 to 6 dry; 2 to 5 moist
Chroma: 1 to 4 dry; 1 to 3 moist
Texture: loam, clay loam, sandy clay loam, sandy loam, stratified loamy coarse sand to loam
Clay content: 10 to 35 percent
Carbonate clay content: 0 to 2 percent
Gravel content: 0 to 15 percent, indurated
Calcium carbonate equivalent: 1 to 10 percent
Reaction: slightly alkaline or moderately alkaline (pH 7.4-8.4)
COMPETING SERIES: These are the
Adderton,
Middlecreek,
Mussigbrod, and
Silas series.
Adderton and Silas soils have an ustic soil moisture regime that does not border aridic.
Middlecreek soils have a udic soil moisture regime.
Mussigbrod soils have a lithologic discontinuity.
GEOGRAPHIC SETTING:
Parent material: mixed alluvium
Landform: flood plains, flood-plain steps, drainageways
Slopes: 1 to 5 percent
Elevation: 8,600 to 9,600 feet
Mean annual temperature: 35 to 39 degrees F.
Mean annual precipitation: 10 to 16 inches
Precipitation pattern: Monthly precipitation is lowest in winter and greatest in July and August.
Frost-free days: 50 to 80 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Betemer, Gebson, and Hodden soils. Betemer soils are shallow to hard bedrock, are loamy-skeletal, and are on hills. Gebson soils have a mollic epipedon less than 16 inches thick, have an argillic horizon, and are on adjacent pediments. Hodden soils are loamy-skeletal and have a mollic epipedon less than 16 inches thick and calcic and argillic horizons.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: These soils are used for livestock grazing and wildlife habitat. Native vegetation is western wheatgrass, blue grama, prairie junegrass, slender wheatgrass, bottlebrush squirreltail, mat muhly, nodding brome, slimstem muhly, inland saltgrass, and needleandthread.
DISTRIBUTION AND EXTENT: Intermontane basins of central Colorado. LRR E, MLRA 48B. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Park County (Teller-Park Area), Colorado, 2010. The name is coined.
REMARKS: Diagnostic horizons and features recognized in this pedon area:
Series control section: The zone 0 to 60 inches.
Particle-size control section: The zone from 10 to 40 inches. (A2, A3, Bw, Bk1 horizons)
Mollic epipedon (Cumulic feature): From 0 to 33 inches. (A1, A2, A3, and Bw horizons); an irregular decrease in organic carbon is inferred from the landform position and the textural stratification.
Secondary carbonates: The zone from 25 to 45 inches. (Bk1, Bk2 horizons)
Cryic temperature regime.