LOCATION POGO COEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, calcareous, mesic Typic Fluvaquents
TYPICAL PEDON: Pogo loam, on a 1 percent slope in a wet meadow. (Colors are for dry soil unless otherwise noted.)
Ay--0 to 2 inches; dark grayish brown (10YR 4/2) loam, very dark grayish brown (10YR 3/2) moist; weak thick platy structure; hard, friable, nonsticky and nonplastic; few fine soft masses of gypsum; strongly effervescent; moderately alkaline (pH 8.0); clear smooth boundary.
Ckyg--2 to 10 inches; light brownish gray (10YR 6/2) silty clay loam, dark grayish brown (10YR 4/2) moist; common fine distinct yellowish red (5YR 4/6), moist, iron masses; massive; very hard, very firm, moderately sticky and moderately plastic; common fine soft masses and filaments of gypsum; few fine seams and filaments of calcium carbonate; violently effervescent; moderately alkaline (pH 8.0); clear smooth boundary.
Cyg1--10 to 20 inches; light brownish gray (10YR 6/2) silty clay loam, dark grayish brown (10YR 4/2) moist; common medium distinct yellowish red (5YR 4/6), moist, iron masses; massive; very hard, very firm, moderately sticky and moderately plastic; common fine soft masses and filaments of gypsum; violently effervescent; moderately alkaline (pH 8.0); clear smooth boundary.
Cyg2--20 to 28 inches; grayish brown (10YR 5/2) silty clay loam, very dark grayish brown (10YR 3/2) moist; many large distinct yellowish red (5YR 4/6), moist, iron masses; massive; hard, friable, slightly sticky and slightly plastic; few fine soft masses of gypsum; violently effervescent; moderately alkaline (pH 8.0); gradual smooth boundary.
Cg1--28 to 36 inches; pale brown (10YR 6/3) very fine sandy loam, dark grayish brown (10YR 4/2) moist; few fine faint yellowish red (5YR 4/6), moist, iron masses; massive; hard, friable, slightly sticky and nonplastic; violently effervescent; moderately alkaline (pH 8.2); clear smooth boundary.
Cg2--36 to 60 inches; brown (10YR 5/3) fine sandy loam, very dark grayish brown (10YR 3/2) moist; few fine faint yellowish red (5YR 4/6), moist, iron masses; massive; very hard, friable, slightly sticky and nonplastic; violently effervescent; moderately alkaline (pH 8.2).
TYPE LOCATION: Montezuma County, Colorado; about 4 miles north of Cortez; located about 300 feet east and 200 feet north of the southwest corner of sec. 25, T. 16 N., R. 37 W.; Dolores west USGS quad; Lat. 37 degrees 25 minutes 42 seconds N. and long. 108 degrees 34 minutes 14 seconds W., NAD27
RANGE IN CHARACTERISTICS:
Soil moisture regime: aquic
Soil temperature regime: mesic
Mean annual soil temperature: 47 to 50 degrees F
Depth to redox concentrations: 2 to 20 inches
Depth to redox depletions: 2 to 20 inches
Water table: depth is 0 to 20 inches, kind is apparent, months are March to September
Particle-size control section:
Clay content: 27 to 35 percent
A horizon:
Hue: 10YR
Value: 4 to 7 (3 to 5 moist)
Chroma: 0 to 2
Rock fragments: 0 to 15 percent gravel
Calcium carbonate equivalent: 0 to 5 percent
Reaction: moderately or strongly alkaline
C horizon:
Hue: 10YR
Value: 5 to 7 (3 to 5 moist)
Chroma: 1 to 3
Texture: stratified with sand to silty clay to clay
Rock fragments: 0 to 15 percent gravel
Calcium carbonate equivalent: 1 to 15 percent
Reaction: moderately or strongly alkaline
COMPETING SERIES: This is the Dobent series. Dobent soils average 18 to 27 percent clay in the particle-size control section.
GEOGRAPHIC SETTING:
Parent material: alluvium derived from mixed sources
Landform: flood plains, and drainageways
Slopes: 0 to 2 percent
Elevation: 5,400 to 7,500 feet
Mean annual temperature: 46 to 52 degrees F
Mean annual precipitation: 10 to 16 inches
Frost-free period: 100 to 135 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Ackmen, Irak and Yarts soils. All these soils are in drainageways but lack the presence of a watertable.
DRAINAGE AND PERMEABILITY: poorly drained, medium runoff, moderately slow permeability
USE AND VEGETATION: Used principally for meadow hay or pasture. Native plants are inland saltgrass, rushes, sedges, and broadleaf cattail.
DISTRIBUTION AND EXTENT: Southwest Colorado. LRR D, MLRA 36. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Cortez Area, Colorado, Parts of Dolores and Montezuma Counties 1997.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Aquic feature: Matrix chroma of 2 within 20 inches of the surface.
Fluvaquent feature: An irregular decrease in organic matter with depth is assumed from stratification and the landscape position of this soil.
Redoximorphic features: Redox concentrations in the zone from 2 to 60 inches.
Water table: The presence of an apparent water table from 0 to 20 inches during spring and summer.
Particle size control section: The zone from 10 to 40 inches. (C1, C2, C3)
Soil Taxonomy Second Edition, 1999