LOCATION BRID MT
Established Series
Rev: RJS/JMS/RJS
07/2013
BRID SERIES
The Brid series consists of shallow, well drained soils that formed in alluvium and/or colluvium. These soils are on fan remnants, eroded fan remnants, and escarpments. Slopes are 0 to 35 percent. Mean annual precipitation is about 380 mm, and mean annual air temperature is about 6 degrees C.
TAXONOMIC CLASS: Loamy, mixed, superactive, frigid, shallow Entic Durustolls
TYPICAL PEDON: Brid gravelly loam, in pasture (colors are for dry soil unless otherwise noted).
A--0 to 30 cm; grayish brown (10YR 5/2) gravelly loam, very dark grayish brown (10YR 3/2) moist; moderate medium granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine irregular pores; 10 percent gravel and 5 percent cobbles; slightly effervescent; slightly alkaline (pH 7.8); clear smooth boundary. (18 to 38 cm thick)
Bk--30 to 38 cm; light gray (10YR 7/2) cobbly loam, dark grayish brown (10YR 4/2) moist; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine roots; common very fine tubular pores; 10 percent gravel and 15 percent cobbles; finely disseminated calcium carbonate, common fine calcium carbonate masses, and many distinct calcium carbonate coats on rock fragments; violently effervescent; moderately alkaline (pH 8.2); abrupt smooth boundary. (8 to 25 cm thick)
2Bkqm--38 to 69 cm; pinkish white (7.5YR 8/2) dry and pink (7.5YR 7/3) moist; indurated silica-calcium carbonate cemented duripan; extremely hard; violently effervescent; moderately alkaline (pH 8.2); abrupt smooth boundary. (15 to 61 cm thick)
3C--69 to 152 cm; very pale brown (10YR 7/4) very gravelly sandy loam, yellowish brown (10YR 5/4) moist; massive; soft, very friable, nonsticky and nonplastic; 45 percent gravel and 5 percent cobbles; finely disseminated carbonates; violently effervescent; moderately alkaline (pH 8.2).
TYPE LOCATION: Ravalli County, Montana; 800 feet south and 1,165 feet east of the NW corner of section 1, T8N, R20W; USGS Bing, Montana topographic quadrangle; North American Datum 83, zone 11, UTM 726614e, 5152103n.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature: 5 to 8 degrees C
Mollic epipedon thickness: 18 to 38 cm
Depth to secondary calcium carbonate accumulation: 18 to 38 cm
Depth to duripan-petrocalcic horizon (2Bkqm): 25 to 50 cm
A horizon:
Hue: 10YR or 2.5Y; dry or moist
Value: 4 or 5 dry, 2 or 3 moist
Chroma: 2 or 3; dry or moist
Texture: loam or sandy loam
Clay content: 14 to 26 percent
Rock fragments: 0 to 30 percent; 0 to 15 percent gravel; 0 to 15 percent cobbles; 0 to 2 percent stones
Calcium carbonate equivalent: 1 to 10 percent
Reaction: pH 7.8 to 8.1
Bk horizon:
Hue: 10YR or 2.5Y; dry or moist
Value: 6 to 8 dry; 4 or 5 moist
Chroma: 2 to 4; dry or moist
Texture: loam or sandy loam
Clay content: 12 to 26 percent
Rock fragments: 5 to 30 percent; 5 to 20 percent gravel; 0 to 15 percent cobbles
Calcium carbonate equivalent: 15 to 40 percent
Reaction: pH 8.0 to 8.4
2Bkqm horizon:
Resistance: moderately cemented to indurated
Calcium carbonate equivalent: 15 to 40 percent
Reaction: pH 8.0 to 8.4
3C horizon:
Hue: 10YR or 2.5Y; dry or moist
Value: 6 to 8 dry; 4 or 5 moist
Chroma: 2 to 4; dry or moist
Texture: loam, sandy loam, loamy sand
Clay content: 6 to 15 percent
Rock fragments: 35 to 75 percent; 35 to 55 percent gravel; 0 to 20 percent cobbles
Calcium carbonate equivalent: 3 to 10 percent
Reaction: pH 7.9 to 8.4
COMPETING SERIES:
Farfeld (ND) - have a cambic horizon; have horizons of silicate clay accumulation
GEOGRAPHIC SETTING:
Landform: fan remnants, eroded fan remnants and escarpments
Elevation: 1,005 to 1,625 meters
Slope: 0 to 35 percent
Parent material: alluvium and colluvium
Climate: cold winters, moist springs, and warm summers
Mean annual precipitation: 330 to 432 mm
Mean annual air temperature: 4 to 7 degrees C
Frost-free period: 90 to 120 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: Brid soils are used mainly for irrigated hayland and pasture. Native vegetation is mainly bluebunch wheatgrass, sandberg bluegrass, forbs, and big sagebrush.
DISTRIBUTION AND EXTENT: Brid soils are of small extent in western Montana valleys. MLRA 44A.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Bitterroot Valley Area, Montana, 2013; proposed in Ravalli County, Montana, 2004.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - from 0 to 30 cm (A horizon)
Horizon of secondary calcium carbonate accumulation - from 30 to 69 cm (Bk, 2Bkqm horizons)
Duripan in conjunction with a petrocalcic horizon - from 38 to 69 cm (2Bkqm horizon)
Particle-size control section - from 25 to 38 cm (part of the A and Bk horizons)
Brid soils have a frigid temperature regime and an ustic moisture regime.
National Cooperative Soil Survey
U.S.A.