LOCATION BRODIE WY
Tentative Series
Rev. TAG-DMM-RJS
03/2011
BRODIE SERIES
The Brodie series consists of very deep, well drained soils that formed in slope alluvium or colluvium derived from metamorphic and sedimentary rock over residuum weathered from sandstone and shale. These soils are on escarpments, eroded fan remnants or hills. Slopes are 2 to 30 percent. Mean annual precipitation is about 430 mm, and mean annual air temperature is about 1 degree C.
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive Calcic Argicryolls
TYPICAL PEDON: Brodie very gravelly loam, in rangeland (colors are for dry soil unless otherwise noted).
A--0 to 9 cm; dark grayish brown (10YR 4/2), very gravelly loam, very dark grayish brown (10YR 3/2), moist; weak fine and medium subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; common very fine, fine and medium roots; many fine interstitial pores; 35 percent gravel, 5 percent cobbles; neutral (pH 7.2); clear smooth boundary. (8 to 18 centimeters thick)
Bt--9 to 27 cm; dark brown (7.5YR 3/3), very gravelly clay loam, very dark brown (7.5YR 2.5/3), moist; moderate medium and coarse subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; common very fine, fine and medium roots; many fine tubular pores; 20 percent patchy distinct clay films on all faces of peds; 35 percent gravel, 5 percent cobbles; slightly alkaline (pH 7.4); clear wavy boundary. (15 to 25 centimeters thick)
Btk--27 to 50 cm; yellowish brown (10YR 5/4), very gravelly clay loam, dark yellowish brown (10YR 4/4), moist; moderate medium and coarse subangular blocky structure; moderately hard, firm, moderately sticky, moderately plastic; common very fine and fine and few medium roots; many fine tubular pores; 60 percent patchy distinct clay films on all faces of peds; 35 percent gravel, 5 percent cobbles; 70 percent distinct carbonate coats on rock fragments and 30 percent irregular carbonate masses in matrix; moderately effervescent (7 percent calcium carbonate equivalent); moderately alkaline (pH 8.2); gradual wavy boundary. (20 to 30 centimeters thick)
Bk--50 to 80 cm; light yellowish brown (10YR 6/4), very gravelly sandy clay loam, yellowish brown (10YR 5/4), moist; weak fine and medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; common very fine and fine and few medium roots; many fine tubular pores; 35 percent gravel, 5 percent cobbles; 30 percent irregular carbonate nodules on bottom of rock fragments; violently effervescent (16 percent calcium carbonate equivalent); moderately alkaline (pH 8.4); gradual smooth boundary. (25 to 35 centimeters thick)
2BCk1--80 to 100 cm; light yellowish brown (2.5Y 6/3), loam, light olive brown (2.5Y 5/3), moist; massive; moderately hard, firm, moderately sticky, moderately plastic; few very fine roots; many fine tubular pores; 20 percent irregular carbonate masses in matrix; violently effervescent (11 percent calcium carbonate equivalent); strongly alkaline (pH 8.6); gradual smooth boundary. (20 to 30 centimeters thick)
2BCk2--100 to 155 cm; brown (10YR 5/3), extremely parachannery silty clay loam, brown (10YR 4/3), moist; massive; moderately hard, firm, moderately sticky, moderately plastic; few very fine roots; many fine tubular pores; 80 percent parachanners; 15 percent irregular carbonate masses in matrix; violently effervescent (10 percent calcium carbonate equivalent); strongly alkaline (pH 8.6); gradual smooth boundary. (45 to 65 centimeters thick)
2Cr--155 to 200 cm; moderately cemented shale bedrock.
TYPE LOCATION: Sublette County, Wyoming; located approximately 917 ft. west and 611 ft. north of the SE corner. of section 6, T 33n, R 112w; USGS Halfway, Wyoming topographic quadrangle; 42 degrees 51 minutes 11.00 seconds north latitude and 110 degrees 15 minutes 24.00 seconds west longitude.
RANGE IN CHARACTERISTICS:
Soil temperature - 1.7 to 3.3 degrees C.
Mollic epipedon thickness - 18 to 40 cm
Depth to argillic horizon - 8 to 18 cm
Depth to calcic horizon - 45 to 60 cm
Depth to lithologic discontinuity - 70 to 100 cm
Depth to paralithic contact - 150 to 200 cm
A horizon
Hue: 7.5YR or 10YR; dry or moist
Value: 3 or 4 dry; 2 or 3 moist
Chroma: 2 or 3; dry or moist
Clay content: 15 to 22 percent
Rock Fragments: 35 to 60 percent--30 to 45 percent gravel, 5 to 20 percent cobbles
Reaction: pH 6.6 to 7.4
Bt horizon
Hue: 7.5YR or 10YR; dry or moist
Value: 3 or 4 dry; 2 or 3 moist
Chroma: 2 or 3; dry or moist
Texture: clay loam, sandy clay loam
Clay content: 20 to 35 percent
Rock Fragments: 35 to 55 percent--25 to 40 percent gravel, 5 to 20 percent cobbles
Reaction: pH 7.4 to 7.8
Btk horizon
Hue: 7.5YR or 10YR; dry or moist
Value: 4 or 5; dry or moist
Texture: clay loam, sandy clay loam, loam
Clay content: 18 to 35 percent
Carbonate clay content: 0 to 4 percent
Calcium carbonate equivalent: 2 to 15 percent
Rock Fragments: 35 to 55 percent--30 to 45 percent gravel, 5 to 20 percent cobbles
Reaction: pH 7.9 to 8.4
Bk horizon
Hue: 7.5YR or 10YR; dry or moist
Value: 5 or 6; dry or moist
Chroma: 3 or 4; dry or moist
Texture: sandy clay loam, clay loam
Clay content: 20 to 35 percent
Carbonate clay content: 1 to 5 percent
Calcium carbonate equivalent: 15 to 25 percent
Rock Fragments: 35 to 55 percent--35 to 50 percent gravel, 0 to 10 percent cobbles
Reaction: pH 7.9 to 8.4
2BCk1 horizon
Hue: 10YR, 2.5Y or 5Y; dry or moist
Value: 5 or 6; dry or moist
Chroma: 3 or 4; dry or moist
Texture: clay loam, loam, silty clay loam
Clay content: 20 to 40 percent
Carbonate clay content: 0 to 5 percent
Calcium carbonate equivalent: 2 to 15 percent
Sodium Absorption Ratio: 0 to 12
Rock Fragments: 0 to 15 percent shale, parachanners
Reaction: pH 7.9 to 8.8
2BCk2 horizon
Hue: 10YR or 2.5Y; dry or moist
Value: 4 or 5; dry or moist
Chroma: 3 or 4; dry or moist
Texture: silty clay loam, clay loam
Clay content: 20 to 30 percent
Carbonate clay content: 0 to 3 percent
Rock Fragments: 55 to 85 percent shale, parachanners
Calcium carbonate equivalent: 2 to 15 percent
Sodium Absorption Ratio: 12 to 25
Reaction: pH 8.5 to 9.0
COMPETING SERIES:
Cavemountain (NV) - is moderately deep to a lithic contact
Hodden (CO) - have greater than 60 percent rock fragments below a depth of 100 cm
Hoodling (CO) - does not have a lithologic discontinuity
Latigo (ID) - have a xeric moisture regime
Maciver (MT) - does not have a lithologic discontinuity
Nurkey (ID) - have a xeric moisture regime
Teeler (WY) - does not have a lithologic discontinuity
Wilhelm (WY) - does not have a lithologic discontinuity
GEOGRAPHIC SETTING:
Landform - escarpments, eroded fan remnants or hills
Elevation - 2,255 to 2,530 meters
Slope - 2 to 30 percent
Parent material - slope alluvium or colluviums derived from metamorphic and sedimentary rock over residuum weathered from sandstone and shale
Climate - long, cold winters; cool, moist springs; short, cool summers
Mean annual precipitation - 380 to 485 mm with peak periods of precipitation occurring during the spring
Mean annual air temperature - 0.6 to 1.7 degrees C.
Frost-free period - 25 to 45 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: Brodie soils are primarily used for rangeland. The potential native vegetation is mainly mountain big sagebrush, Letterman's needlegrass, Columbia needlegrass, snowberry, and Idaho fescue.
DISTRIBUTION AND EXTENT: Brodie soils are of small extent in southwestern Wyoming. MLRAs 34A and 43B.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana.
SERIES PROPOSED: Sublette County, Wyoming, 2011. The series name is derived from a local landmark.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - from 0 to 27 cm (A, Bt horizons)
Argillic horizon - from 9 to 50 cm (Bt, Btk horizons)
Calcic horizon - from 50 to 80 cm (Bk horizon)
Paralithic contact - shale bedrock at 155 cm (Cr horizon)
Particle-size control section - from 9 to 50 cm (Bt, Btk horizons).
Brodie soils have a cryic temperature regime and an ustic moisture regime.
Taxonomic version: Eleventh Edition, 2010.
National Cooperative Soil Survey
U.S.A.