LOCATION YOGOVUCI COEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, active, mesic Typic Argigypsids
TYPICAL PEDON: Yogovuci fine sandy loam, on a southwest facing, 3 percent slope in rangeland at an elevation of 5,060 feet. (Colors are for dry soil unless otherwise noted.)
A--0 to 2 inches; light brown (7.5YR 6/4) very fine sandy loam, brown (7.5YR 5/4) moist; moderate very fine granular structure; soft, very friable, slightly sticky and nonplastic; many very fine roots throughout; 11 percent calcium carbonate equivalent; 8 percent gravel; strongly effervescent; strongly alkaline (pH 8.5); clear smooth boundary. (2 to 6 inches)
BA--2 to 6 inches; light brown (7.5YR 6/4) loam, brown (7.5YR 5/4) moist; moderate thick platy structure parting to weak very fine granular structure; slightly hard, friable, moderately sticky and moderately plastic; many very fine roots throughout; many very fine dendritic tubular pores; 10 percent calcium carbonate equivalent; 8 percent gravel; strongly effervescent; moderately alkaline (pH 8.1); clear smooth boundary.
Btk--6 to 13 inches; light yellowish brown (10YR 6/4) clay loam, yellowish brown (10YR 5/4) moist; moderate medium prismatic structure parting to moderate medium subangular blocky; slightly hard, friable, moderately sticky and moderately plastic; common very fine and few fine roots throughout; many very fine dendritic tubular pores; few distinct clay films on faces of peds and in pores; common medium irregular masses of carbonate; 11 percent calcium carbonate equivalent; 1 percent gypsum; 8 percent gravel; strongly effervescent; moderately alkaline (pH 7.9); abrupt smooth boundary. (5 to 20 inches)
2Bty1--13 to 23 inches; very pale brown (10YR 7/3) gypsiferous clay loam, yellowish brown (10YR 5/6) moist; moderate medium subangular blocky structure; hard, very firm, moderately sticky and moderately plastic; few very fine roots throughout; common very fine dendritic tubular pores; few distinct clay films on faces of peds and in pores; many medium lenticular gypsum crystals and common medium irregular nests of gypsum; 4 percent calcium carbonate equivalent; 17 percent gypsum; slightly effervescent; moderately alkaline (pH 7.9); gradual smooth boundary. (15 to 30 inches thick 2Bty horizons)
2Bty2--23 to 35 inches; light yellowish brown (10YR 6/4) clay loam, yellowish brown (10YR 5/4) moist; moderate medium angular blocky structure; extremely hard, slightly rigid, very sticky and very plastic; few very fine roots throughout; common very fine dendritic tubular pores; ; few distinct clay films on faces of peds and in pores; many distinct pressure faces on faces of peds; common fine irregular nests of gypsum and few medium gypsum rosettes; 8 percent calcium carbonate equivalent; 11 percent gypsum; 2 percent gravel; very slightly effervescent; moderately alkaline (pH 8.1); abrupt wavy boundary.
2By1--35 to 48 inches; brownish yellow (10YR 6/6) loamy sand; yellowish brown (10YR 5/6) moist; massive; slightly hard, friable, nonsticky and nonplastic; few very fine roots throughout; common fine irregular gypsum crystals; 8 percent calcium carbonate equivalent; 1 percent gypsum; 8 percent gravel; slightly effervescent; moderately alkaline (pH 8.3); abrupt wavy boundary. (30 to 80 inches thick 2By horizons)
2By2--48 to 59 inches; light yellowish brown (10YR 6/4) clay loam, yellowish brown (10YR 5/4) moist; weak medium prismatic structure parting to moderate medium angular blocky; extremely hard, slightly rigid, very sticky and very plastic; few very fine roots throughout; many very fine dendritic tubular pores; many distinct pressure faces on faces of peds; common fine irregular nests of gypsum and common medium gypsum rosettes; 8 percent calcium carbonate equivalent; 6 percent gypsum; 5 percent gravel; strongly effervescent; moderately alkaline (pH 8.3); abrupt smooth boundary.
2By3--59 to 75 inches; light yellowish brown (10YR 6/4) gravelly sandy loam, yellowish brown (10YR 5/4) moist; single grain; loose, loose, slightly sticky and nonplastic; few very fine roots throughout; 11 percent calcium carbonate equivalent; 4 percent gypsum; 23 percent gravel; strongly effervescent; moderately alkaline; (pH 8.3); abrupt smooth boundary.
2By4--75 to 107 inches; very pale brown (10YR 7/4) extremely gravelly loamy sand, yellowish brown (10YR 5/4) moist; single grain; loose, loose, nonsticky and nonplastic; few fine irregular carbonate crystals on bottom of rock fragments; few fine irregular gypsum crystals on the bottom of gravel; 12 percent calcium carbonate; 75 percent gravel; violently effervescent; moderately alkaline (pH 8.1); abrupt smooth boundary.
3Cr--107 to 111 inches; soft Mancos Shale
TYPE LOCATION: Montezuma County, Colorado; about 14 miles southwest of Towaoc, Colorado; Mariano Wash West, Colorado USGS quad; lat. 37 degrees 08 minutes 35 seconds N. and long. 108 degrees 57 minutes 46 seconds W., NAD 27.
RANGE IN CHARACTERISTICS:
Soil moisture regime: Typic aridic
Mean annual soil temperature: 54 to 58 degrees F
Depth to argillic horizon: 5 to 15 inches
Depth to secondary calcium carbonate: 5 to 15 inches
Depth to gypsic horizon: 5 to 25 inches
Particle-size control section (weighted average):
Clay content: 18 to 35 percent
Rock fragments: 5 to 15 percent gravel
A horizon:
Hue: 7.5YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 or 4
Texture: very fine sandy loam
Clay content: 10 to 20 percent
Rock fragments: 0 to 10 percent igneous and sedimentary gravel
EC (mmhos/cm): 0 to 4
Calcium carbonate equivalent: 5 to 15 percent
Gypsum: 0 to 3 percent
SAR: 1 to 5
Reaction: moderately alkaline to strongly alkaline
Btk horizon:
Hue: 7.5YR or 10YR
Value: 6 or 7 dry, 5 or 6 moist
Chroma: 3 or 4
Texture: loam, clay loam or very fine sandy loam
Clay content: 18 to 40 percent
Rock fragments: 0 to 10 percent gravel
EC (mmhos/cm): 2 to 4
Calcium carbonate equivalent: 5 to 15 percent
Gypsum: 0 to 3 percent
SAR: 1 to 13
Reaction: moderately alkaline
2Bty horizon:
Hue: 10YR
Value: 6 or 7 dry, 5 to 7 moist
Chroma: 3 to 6
Texture: loam, clay loam, gypsiferous clay loam
Clay content: 18 to 35 percent
Rock fragments: 0 to 15 percent igneous and sedimentary gravel
EC (mmhos/cm): 2 to 4
Calcium carbonate equivalent: 1 to 10 percent
Gypsum: 10 to 20 percent
SAR: 1 to 13
Reaction: moderately alkaline
2By horizons:
Hue: 10YR
Value: 6 or 7 dry, 5 or 6 moist
Chroma: 3 to 6
Texture: coarsely stratified loamy sand, sandy loam, loam, sandy clay loam, clay, clay loam
Clay content: 10 to 50 percent
Rock fragments: 0 to 35 percent igneous and sedimentary gravel (this is a weighted average - some horizons contain more)
EC (mmhos/cm): 4 to 16
Calcium carbonate equivalent: 5 to 15 percent
Gypsum: 1 to 15 percent
SAR: 1 to 13
Reaction: moderately alkaline to strongly alkaline
COMPETING SERIES: This is the Chimrock (CO), Fruita (CO), and Fruitvale (CO) series. Chimrock soils are derived from shale and sandstone and have 2.5Y hue in the lower part of the profile. Fruita soils have more than 15 percent by weight gypsum in the gypsic horizon. Fruitvale soils have clayey substrata.
GEOGRAPHIC SETTING:
Parent material: eolian deposits derived from sandstone overlying alluvium derived from igneous materials
Landform: fan remnants and paleoterraces
Slopes: 1 to 6 percent
Elevation: 4,800 to 5,700 feet
Mean annual temperature: 52 to 56 degrees F
Mean annual precipitation: 7 to 10 inches
Precipitation pattern: uniform with slight dip in May and June and slight increase in July and August
Frost-free period: 135 to 160 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Gypsey, Persayo, and Taqoci series. The Gypsey soils are moderately deep to shale, and the Persayo soils are shallow to shale. Both are on pediments. The Taqoci soils have a natric horizon and are on alluvial fan remnants.
DRAINAGE AND PERMEABILITY: Well drained, medium or high runoff, slow permeability.
USE AND VEGETATION: They are used as grazing land and, to a limited extent, irrigated agriculture. Native vegetation is galleta, shadscale, alkali sacaton, and Indian ricegrass.
DISTRIBUTION AND EXTENT: Southwest Colorado; MLRA 35. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona.
SERIES ESTABLISHED: Montezuma County, Colorado, Ute Mountain Area, Colorado and New Mexico, 2005. The name is derived from a Ute word for coyote.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Series control section: The zone from 0 to 79 inches.
Particle-size control section: The zone from 6 to 35 inches. (Btk, 2Bty1 and Bty2 horizons)
Argillic horizon: The zone from 6 to 35 inches (Btk and 2Bty horizons)
Gypsic horizon: The zone from 13 to 35 inches (2Bty1, 2Bty2 horizons)
Ochric epipedon: The zone from 0 to 6 inches. (A and BA horizons)
Lithologic discontinuity: At the upper boundary of the 2Bty horizon.
Classified according to Soil Taxonomy Second Edition, 1999; Keys to Soil Taxonomy Tenth Edition, 2006.
ADDITIONAL DATA: The typical pedon for Yogovuci was sampled by NSSL for full characterization; sample S99CO-083-03.