LOCATION KIBIN COEstablished Series
TAXONOMIC CLASS: Fine-loamy over sandy or sandy-skeletal, mixed, superactive, frigid Pachic Argiustolls
TYPICAL PEDON: Kibin fine sandy loam, 0 to 3 percent slope in cropland at an elevation of 7637 feet. (Colors are for dry soil unless otherwise noted.) When described on June 26, 2000 soil was dry throughout. The surface is covered by about 25 percent indurated gravel derived from granite, gneiss, and mica schist.
Ap1--0 to 1 inches; brown (10YR 5/3) crushed, fine sandy loam, very dark grayish brown (10YR 3/2) crushed, moist; 54 percent sand; 26 percent silt; 20 percent clay; weak fine granular structure; friable, slightly hard, moderately sticky, moderately plastic; common fine roots throughout and common very fine roots throughout; common fine irregular and common fine dendritic tubular and common very fine irregular and common very fine dendritic tubular pores; 3 percent fine gravel and 4 percent medium gravel; slightly alkaline (pH 7.6); clear smooth boundary. (1 to 10 inches thick)
Ap2--1 to 3 inches; yellowish brown (10YR 5/4) crushed, sandy clay loam, very dark grayish brown (10YR 3/2) crushed, moist; 49 percent sand; 28 percent silt; 23 percent clay; moderate thin platy structure; friable, slightly hard, moderately sticky, moderately plastic; common fine roots throughout and common very fine roots throughout; common fine irregular and common fine dendritic tubular and common very fine irregular and common very fine dendritic tubular pores; 2 percent fine gravel and 3 percent medium gravel and 4 percent coarse gravel; neutral (pH 6.8); clear smooth boundary. (0 to 4 inches thick)
Ap3--3 to 9 inches; yellowish brown (10YR 5/4) crushed, sandy clay loam, dark brown (10YR 3/3) crushed, moist; 52 percent sand; 26 percent silt; 22 percent clay; moderate fine subangular blocky structure parting to moderate very fine subangular blocky structure; friable, slightly hard, moderately sticky, moderately plastic; common fine roots throughout and common very fine roots throughout; common fine irregular and common fine dendritic tubular and common very fine irregular and common very fine dendritic tubular pores; 1 percent fine gravel and 5 percent medium gravel and 5 percent coarse gravel; neutral (pH 6.8); clear smooth boundary. (0 to 7 inches thick)
Bt--9 to 14 inches; brown (10YR 5/3) crushed, sandy clay loam, very dark grayish brown (10YR 3/2) crushed, moist; 54 percent sand; 25 percent silt; 21 percent clay; moderate coarse prismatic structure parting to moderate medium prismatic structure parting to moderate medium subangular blocky structure parting to moderate fine subangular blocky structure; firm, moderately hard, moderately sticky, moderately plastic; common fine roots throughout and common very fine roots throughout; common fine irregular and common fine dendritic tubular pores; common distinct clay films on all faces of peds; 1 percent fine gravel and 3 percent medium gravel and 7 percent coarse gravel; neutral (pH 7.2); clear wavy boundary. (3 to 7 inches thick)
Btb--14 to 19 inches; grayish brown (10YR 5/2) crushed, loam, very dark grayish brown (10YR 3/2) crushed, moist; 41 percent sand; 32 percent silt; 27 percent clay; moderate medium prismatic structure parting to moderate medium angular blocky structure parting to moderate fine angular blocky structure; firm, moderately hard, moderately sticky, moderately plastic; common fine roots throughout and common very fine roots throughout; common fine irregular and common fine dendritic tubular and common very fine irregular and common very fine dendritic tubular pores; common distinct clay films on all faces of peds; 2 percent fine gravel; slightly alkaline (pH 7.6); clear wavy boundary. (0 to 7 inches thick)
Btkb1--19 to 27 inches; light brownish gray (10YR 6/2) crushed, loam, brown (10YR 4/3) crushed, moist; 43 percent sand; 34 percent silt; 23 percent clay; moderate coarse prismatic structure parting to moderate medium prismatic structure parting to moderate coarse subangular blocky structure parting to moderate medium subangular blocky structure; firm, moderately hard, moderately sticky, moderately plastic; common fine roots throughout and common very fine roots throughout; common fine irregular and common fine dendritic tubular and common very fine irregular and common very fine dendritic tubular pores; common distinct clay films on bottom surfaces of rock fragments and common distinct clay films on all faces of peds; carbonate masses on bottom of rock fragments; 1 percent fine gravel and 1 percent medium gravel; slight effervescence; slightly alkaline (pH 7.6); clear wavy boundary. (0 to 10 inches thick)
Btkb2--27 to 37 inches; grayish brown (10YR 5/2) crushed, clay loam, very dark grayish brown (10YR 3/2) crushed, moist; 23 percent sand; 39 percent silt; 38 percent clay; strong coarse prismatic structure parting to strong medium prismatic structure parting to strong medium angular blocky structure parting to strong fine angular blocky structure; very firm, hard, very sticky, very plastic; common fine roots throughout and common very fine roots throughout; common fine irregular and common fine dendritic tubular and common very fine irregular and common very fine dendritic tubular pores; common distinct clay films on bottom surfaces of rock fragments and common distinct clay films on all faces of peds; carbonate masses on bottom of rock fragments; 2 percent fine gravel and 3 percent medium gravel and 3 percent coarse gravel; slight effervescence; slightly alkaline (pH 7.6); clear wavy boundary. (0 to 12 inches thick)
2Btk--37 to 52 inches; brown (7.5YR 4/4) crushed, extremely gravelly loamy coarse sand, brown (7.5YR 4/3) crushed, moist; 85 percent sand; 4 percent silt; 11 percent clay; weak fine subangular blocky structure; very friable, soft, slightly sticky, slightly plastic; common fine roots throughout and common very fine roots throughout; common fine irregular and common fine dendritic tubular and common very fine irregular and common very fine dendritic tubular pores; common prominent clay films on bottom surfaces of rock fragments; carbonate masses on bottom of rock fragments; 14 percent fine gravel and 53 percent coarse gravel; slight effervescence; slightly alkaline (pH 7.4); gradual wavy boundary. (10 to 20 inches thick)
2Bk--52 to 71 inches; extremely gravelly coarse sand; 94 percent sand; colors vary with differing mineralogy, 2 percent silt; 4 percent clay; single grain; loose, loose, nonsticky, nonplastic; common fine roots throughout and common very fine roots throughout; common fine irregular and common very fine irregular pores; carbonate masses on bottom of rock fragments; 2 percent fine gravel and 15 percent medium gravel and 44 percent coarse gravel; slightly alkaline (pH 7.4).
TYPE LOCATION: Costilla County, CO; Garcia USGS quad; lat. 37 degrees 01 minutes 59 seconds N. and long. 105 degrees 35 minutes 59 seconds W., NAD 83; UTM 446,642mE, 4,098,509mN, Zone 13S.
RANGE IN CHARACTERISTICS:
Soil moisture: The soil moisture control section is 4-12 inches, Aridic moisture regime bordering on Ustic.
Mean annual soil temperature: 41 to 46 degrees F
Mean summer soil temperature: 63 to 66 degrees F
Thickness of mollic epipedon: 16 to 40 inches
Depth to abrupt textural change: 20 to 40 inches
Depth to argillic horizon: 5 to 15 inches
Depth to secondary calcium carbonate: 15 to 25 inches
Particle-size control section (weighted average):
Upper part:
Clay content: 20 to 35 percent
Sand content: 40 to 55 percent
Rock fragments: 0 to 15 percent subrounded fine to coarse gravel
Lower part:
Clay content: 0 to 15 percent
Sand content: 80 to 100 percent
Rock fragments: 35 to 90 percent
Ap horizon(s):
Hue: 7.5YR or 10YR
Value: 4 or 5 dry, 2 or 3 moist
Chroma: 2 or 3 moist
Texture: fine sandy loam, sandy loam, or sandy clay loam
Clay content: 15 to 27 percent
Sand content: 45 to 70 percent
Silt content: 5 to 25 percent
Fragments: 0 to 15 percent indurated gravel derived from granite, gneiss, and mica schist
Reaction: 6.1 to 7.8
Organic matter: 1 to 4 percent
Bt horizon(s):
Hue: 7.5YR or 10YR
Value: 4 or 5 dry, 2 or 3 moist
Chroma: 2 or 3 moist
Texture: sandy clay loam
Clay content: 20 to 27 percent
Sand content: 50 to 65 percent
Silt content: 10 to 28 percent
Fragments: 5 to 15 percent indurated gravel derived from granite, gneiss, and mica schist
Reaction: 6.6 to 7.3
Organic matter: 1 to 3 percent
Btb horizon(s) if present:
Hue: 7.5YR or 10YR
Value: 4 or 5 dry, 2 or 3 moist
Chroma: 2 or 3 moist
Texture: loam or clay loam
Clay content: 20 to 30 percent
Sand content: 25 to 45 percent
Silt content: 30 to 45 percent
Fragments: 0 to 5 percent indurated gravel derived from granite, gneiss, and mica schist
Calcium carbonate equivalent: 0 to 3 percent
Reaction: 7.4 to 7.8
Organic matter: 1 to 4 percent
Btkb or Btk horizon(s):
Hue: 7.5YR or 10YR
Value: 4 to 6 dry, 3 or 4 moist
Chroma: 2 or 3 moist
Texture: loam or clay loam
Clay content: 20 to 40 percent
Sand content: 20 to 45 percent
Silt content: 25 to 45 percent
Fragments: 0 to 10 percent indurated gravel derived from granite, gneiss, and mica schist
Calcium carbonate equivalent: 0 to 3 percent (some matrix soils are noncalcareous)
Reaction: 7.4 to 8.4
2Btk horizon(s):
Hue: 7.5YR or 10YR
Value: 3 to 5 dry, 3 to 5 moist
Chroma: 3 to 5 dry, 2 to 4 moist
Texture: extremely gravelly loamy coarse sand
Clay content: 0 to 15 percent
Sand content: 80 to 90 percent
Silt content: 0 to 15
Fragments: 35 to 90 percent indurated gravel derived from granite, gneiss, and mica schist
Calcium carbonate equivalent: 0 to 3 percent (some matrix soils are noncalcareous)
Reaction: 7.4 to 7.8
2Bk horizon(s):
Color: Multi-colored matrix
Texture: extremely gravelly coarse sand
Clay content: 0 to 10 percent
Sand content: 90 to 100 percent
Silt content: 0 to 10 percent
Fragments: 35 to 90 percent indurated gravel derived from granite, gneiss, and mica schist
Reaction: 6.6 to 7.8
COMPETING SERIES:
Brisbane (ND): has less than 10 percent coarse fragments in 2C horizon
GEOGRAPHIC SETTING:
Parent material: Fine-loamy alluvium over outwash derived from granite, gneiss, and mica schist
Landform: Stream terrace on an intermontane basin
Slopes: 0 to 5 percent
Elevation: 7500 to 8500 feet
Mean annual temperature: 39 to 43 degrees F
Mean annual precipitation: 8 to 12 inches
Precipitation pattern: Precipitation peaks in July and August as intense summer thunderstorms.
Frost-free period: 85 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS:
Grayco soils: lack a mollic epipedon.
DRAINAGE AND PERMEABILITY: Well drained, low runoff, moderately slow permeability
USE AND VEGETATION: The major use is irrigated cropland. The native plant community is Wyoming big sagebrush, rubber rabbitbrush and blue grama.
DISTRIBUTION AND EXTENT: South-central Colorado, High Intermountain Valley, LRR E, MLRA 51; moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Costilla County, CO, Costilla County Area soil survey, CO, 2009. The name Kibin is coined.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: The zone from 10 to 40 inches.
Mollic epipedon: The zone from 0 to 19 inches.
Argillic horizon: The zone from 9 to 37 inches.
Abrupt textural change: 37 inches
Other features: Some pedons feature thin strata of coarse sand at a depth of 15 to 25 inches.
Taxonomic Version: Tenth Edition, 2006
ADDITIONAL DATA:
Sampled as pedon S00CO-023-002