LOCATION DUGUESCLIN IDEstablished Series
TAXONOMIC CLASS: Fine, smectitic, frigid Chromic Durixererts
TYPICAL PEDON: Duguesclin very cobbly clay loam - rangeland at an elevation of 5,440 feet. (Colors are for dry soil unless otherwise noted.
A--0 to 2 inches; yellowish brown (10YR 5/4) very cobbly clay loam, dark brown (10YR 3/3) moist; moderate very fine and fine granular structure; hard, very friable, sticky and plastic; many fine and few medium and coarse roots; common fine and very fine and few medium irregular pores; 15 percent gravel, 40 percent cobbles; few cracks 1 to 2 cm wide; neutral (pH 7.0); clear broken boundary. (0 to 4 inches thick)
Bss1--2 to 11 inches; yellowish brown (10YR 5/4) clay, dark yellowish brown (10YR 3/4) moist; strong fine and very fine subangular blocky structure; very hard, firm, very sticky and very plastic; common very fine and fine and few medium and coarse roots; common fine and very fine irregular pores; few intersecting slickensides; few cracks 1 to 2 cm wide; neutral (pH 7.0); clear wavy boundary. (5 to 13 inches thick)
Bss2--11 to 22 inches; brown (7.5YR 5/4) clay, dark brown (7.5YR 3/4) moist; weak medium subangular blocky structure; very hard, firm, very sticky and very plastic; few very fine, fine and medium roots; common very fine and fine irregular and few very fine and fine tubular pores; few intersecting slickensides and pressure faces; few cracks 1 to 2 cm wide; neutral (pH 7.0); abrupt wavy boundary. (5 to 15 inches thick)
Bq--22 to 33 inches; light brown (7.5YR 6/4) clay loam, brown (7.5YR 4/4) moist; massive; hard, friable, very sticky and very plastic; few very fine roots and a root mat at the base of the horizon; common fine and very fine irregular pores; ped faces weakly cemented by silica; few, faint manganese or iron-manganese stains on faces of peds; neutral (pH 6.8); abrupt smooth boundary. (0 to 15 inches thick)
Bqm--33 to 41 inches; pink (7.5YR 7/4) duripan, brown (7.5YR 4/4) moist; massive; continuous, indurated laminar silica cap (l mm thick) is underlain by weakly cemented material; abrupt broken boundary. (1 to 18 inches thick)
2R--41 inches; fractured, basalt
TYPE LOCATION: Gooding County, Idaho; about 15 miles north of Gooding; about one half mile east of the head of Burnt Willow Canyon; about 80 feet north and 1,600 feet west of the southeast corner of Sec. 17, T3S, R15E. Lat. 43 degrees north, 42 minutes, 1 second; Long. 114 degrees west, 9 minutes, 57 seconds.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 45 to 47 degrees F.
Depth to duripan - 20 to 40 inches
Depth to bedrock - 40 to 60 inches
Clay (control section average) - 40 to 60 percent
Reaction - slightly acid to neutral
Cracks - open July through October; closed during the winter; 1 to 3 cm wide at a depth of 50 to 65 cm and extending upwards to the surface
A horizon
Value - 4 or 5 dry
Chroma - 3 or 4 dry or moist
Rock fragments - 5 to 20 percent gravel
- 5 to 50 percent cobbles
- 0 to 10 percent stones
Bss horizons
Hue - 5YR through 10YR
Value - 4 through 7 dry; 3 through 5 moist
Chroma - 3 through 6 dry or moist
Texture - SIC, C Clay content - 40 to 60 percent
Rock fragments - 0 to 10 percent gravel
- 0 to 5 percent cobbles
Few to common intersecting slickensides
Bq horizon
Hue - 7.5YR or 5YR
Value - 4 through 7 dry or moist
Chroma - 3 through 5 dry or moist
Texture - CL, C
Clay content - 35 to 60 percent
Bqm horizon
Hue - 10YR or 7.5YR
Value - 4 through 8 dry or moist
Chroma - 2 through 5 dry or moist
Distance between indurated silica caps - .5 mm to 3 inches
Thickness of indurated silica caps - .5 mm to 2 mm thick
Cementation between caps - weak to strong
COMPETING SERIES: There are no other series in this family.
GEOGRAPHIC SETTING: Duguesclin soils are on plains, plateaus and mesas. Duguesclin soils are underlain by basalt and developed in loess. Slopes are 1 to 6 percent. Elevations range from 5,100 to 5,900 feet. The average annual precipitation is 13 to 16 inches. The average annual air temperature is 43 to 45 degrees F. and the frost free period is 70 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Schooler soils on ridges and sideslopes and the Willho soils in broad drainageways and on mounds. Schooler soils are moderately deep to bedrock and lack a duripan. Willho soils have an indurated duripan and lack vertic properties.
DRAINAGE AND PERMEABILITY: Well drained; runoff is rapid; permeability is very slow.
USE AND VEGETATION: Duguesclin soils are used for rangeland. Potential native vegetation is low sagebrush and bluebunch wheatgrass.
DISTRIBUTION AND EXTENT: Duguesclin soils are of small extent in south central Idaho.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Gooding County, Idaho, 1993.
REMARKS: This revision changes the classification from Haplic Durixeralfs to Chromic Durixererts.
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: the zone from 0 to 2 inches (A horizon)
Cambic horizon: the zone from 2 to 22 inches (Bss1 and Bss2 horizons)
Duripan: the zone from 33 to 41 inches (Bqm horizon)
Few to common intersecting slickensides (Bss1 and Bss2 horizons)
Cracks- open July through October; closed during the winter; 1 to 3 cm wide at a depth of 50 to 65 cm and extending upwards to the surface
Particle-size control section: zone from 10 inches to 33 inches (part of the Bss1, the Bss2, and the Bq horizons)