LOCATION ANVIK COEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Alfic Argicryolls
TYPICAL PEDON: Anvik loam, in woodland with grass understory. (Colors are for dry soil unless otherwise noted.)
Oi--0 to 1 inch; undecomposed needles and twigs.
A1--1 to 7 inches; brown (7.5YR 5/2) loam, dark brown (7.5YR 3/2) moist; weak fine granular structure; soft, very friable; neutral; clear smooth boundary.
A2--7 to 11 inches; brown (7.5YR 5/2) loam, dark brown (7.5YR 3/2) moist; weak medium subangular blocky structure that parts to moderate medium granular; slightly hard, very friable, neutral; clear smooth boundary. (Combined thickness of the A horizons is 7 to 16 inches)
E--11 to 16 inches; pinkish gray (7.5YR 6/2) loam, brown (7.5YR 4/4) moist; weak medium platy structure that parts to moderate medium granular; slightly hard, very friable; neutral; clear wavy boundary. (3 to 7 inches thick)
B/E--16 to 21 inches; light yellowish brown (10YR 6/4) clay loam, yellowish brown (10YR 5/4) moist; moderate medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; few faint clay films on faces of peds; about 20 percent of horizon is composed of diffuse tongues of material like that described in the E horizon; slightly acid; clear wavy boundary. (3 to 8 inches thick)
Bt1--21 to 41 inches; light yellowish brown (10YR 6/4) cobbly clay loam, yellowish brown (10YR 5/4) moist; strong medium subangular blocky structure; hard, firm, slightly sticky and slightly plastic; many distinct clay films on faces of peds; 15 percent cobbles and stones; slightly acid; gradual wavy boundary. (8 to 25 inches thick)
Bt2--41 to 49 inches; light yellowish brown (10YR 6/4) cobbly clay loam, yellowish brown (10YR 5/4) moist; moderate coarse subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common distinct clay films on faces of peds; 25 percent cobbles and stones; slightly acid; clear wavy boundary. (Combined thickness of the Bt horizons is 15 to 40 inches)
C--49 to 61 inches; light yellowish brown (10YR 6/4) cobbly clay loam, yellowish brown (10YR 5/4) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; 35 percent cobbles and stones; neutral.
TYPE LOCATION: Summit County, Colorado; about 17 miles south of Kremmling; located about 1,000 feet north and 600 feet west of the SE corner of Sec. 28, T. 3 S., R. 78 W.; Ute Peak USGS quad; lat. 39 degrees 45 minutes 27 seconds N. and long. 106 degrees 07 minutes 21 seconds W., NAD 27
RANGE IN CHARACTERISTICS: (depths are measured from the mineral soil surface)
Soil moisture regime: ustic
Mean annual soil temperature: about 42 degrees F.
Mean summer soil temperature: about 58 degrees F.
Thickness of the mollic epipedon: 7 to 16 inches
Base saturation: 80 to 100 percent
Reaction: slightly acid to slightly alkaline
Particle-size control section:
Clay content: 18 to 35 clay, 10 to 50 percent silt, 20 to 60 percent sand, with 15 to 35 percent being fine sand or coarser.
Rock fragment content: 0 to 35 percent.
A horizon:
Hue: 7.5YR to 2.5Y
Value: 4 or 5 dry, 2 or 3 moist
Chroma: 2 or 3, dry and moist
Rock fragment content: 0 to 35 percent
E horizon:
Hue: 7.5YR to 2.5Y
Value: 6 to 8 dry, 4 to 6 moist
Chroma: 2 to 4, dry and moist
Texture, fine earth fraction: L, SL
Rock fragment content: 0 to 35 percent
Bt horizon:
Hue: 7.5YR to 2.5Y
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 2 to 6, dry and moist
Texture, fine earth fraction: CL, SCL, L
Rock fragment content: 0 to 35 percent
C horizon:
Hue: 7.5YR to 2.5Y
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 to 6, dry and moist
Texture, fine earth fraction: SCL, CL
Rock fragment content: 0 to 35 percent
COMPETING SERIES: These are the
Bear Basin,
Monad,
Quietus, and
Slipman series.
Bear Basin: are strongly acid.
Slipman: have more than 35 percent fine sand and coarser in the Bt2 horizon.
Monad: does not have an E horizon, has a glossic horizon above the argillic horizon
Quietus: have a lithic contact at depths of less than 40 inches.
GEOGRAPHIC SETTING:
Parent material: alluvium derived from mixed sources.
Landform: alluvial fans and valley filling sideslopes.
Slopes: 3 to 50 percent
Mean annual air temperature: about 40 degrees F.
Mean annual precipitation: about 18 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Ansel and
Jerry soils.
Ansel soils have an ochric epipedon.
Jerry soils lack an albic horizon, and have more than 35 percent clay in the argillic horizon.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderate permeability.
USE AND VEGETATION: These soils are used timber production, livestock grazing, and wildlife habitat. Native vegetation consists of quaking aspen, serviceberry, and bluegrass.
DISTRIBUTION AND EXTENT: North central Colorado. LRR E, MLRA 48A. This series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Summit County, Colorado, 1974.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon: The zone from 1 to 11 inches. (A1 and A2 horizons)
Argillic horizon: The zone from 21 to 41 inches. (Bt1 and Bt2 horizons)
Alfic feature: a horizon above the argillic horizon with value too high for a mollic epipedon and chroma too high for an albic horizon (E horizon)
Particle size control section: The zone from 16 to 36 inches. (B/E horizon and part of the Bt1 horizon)
Keys to Soil Taxonomy: Classified according to the Eighth Edition, 1998
Activity class presumed from the general trend of other soils in the area.
ADDITIONAL DATA: