LOCATION NARROWS WY+ID+MT
Established Series
Rev. KTS-GFB-RJS
03/2012
NARROWS SERIES
The Narrows series consists of very deep, very poorly drained soils that formed in alluvium or lacustrine deposits. These soils occur on flood plains, stream terraces, drainageways, depressional areas and lakebeds. Slopes are 0 to 8 percent. Mean annual precipitation is about 430 mm, and the mean annual air temperature is about 3 degrees C.
TAXONOMIC CLASS: Fine, smectitic Vertic Cryaquolls
TYPICAL PEDON: Narrows silty clay, grassland (colors are for moist soil unless otherwise noted).
Oi--0 to 5 cm; organic layer consisting mainly of slightly decomposed grass roots. (0 to 8 cm thick)
A--5 to 18 cm; black (10YR2/1) silty clay, dark gray (10YR 4/1) dry; weak fine subangular blocky structure that parts to strong coarse granules; hard, firm, very sticky and very plastic; strongly effervescent; moderately alkaline (pH 8.0); clear smooth boundary. (13 to 25 cm thick)
Assg--18 to 25 cm; black (10YR 2/1) silty clay, dark gray (10YR 4/1) dry; common prominent dark yellowish brown (10YR 4/6) redox concentrations; moderate medium prismatic structure that parts to strong fine angular blocky; very hard, very firm, very sticky and very plastic; many slickensides; strongly effervescent; moderately alkaline (pH 8.3); clear smooth boundary. (0 to 13 cm thick)
Bssg--25 to 41 cm; dark brown (7.5YR 3/2) silty clay, brown (7.5YR 5/2) dry; common medium prominent dark yellowish brown (10YR 4/6) redox concentrations; moderate medium prismatic structure that parts to strong fine angular blocks; very hard, very firm, very sticky and very plastic; many slickensides; many crack filling of material from the overlying horizons; slightly effervescent; moderately alkaline (pH 8.3); clear smooth boundary. (0 to 25 cm thick)
Bkg--41 to 56 cm; dark gray (2.5Y 4/1) silty clay, gray (2.5Y 5/1) dry; common medium prominent dark yellowish brown (10YR 4/6) redox concentrations; weak fine angular blocky structure; very hard, firm, very sticky and very plastic; seams and crack fillings of dark material from the A horizons; finely disseminated calcium carbonate and hard concretionary from 1 to 3 inches in diameter; moderately alkaline (pH 8.3); gradual wavy boundary. (13 to 30 cm thick)
BCkg1--56 to 76 cm; gray (5Y 5/1) clay loam, gray (5Y 6/1) dry; common medium prominent dark brown (7.5YR 4/4) and black (10YR 2/1) redox concentrations; massive; very hard, friable; moderately sticky and moderately plastic; finely disseminated calcium carbonate occurring in marl-like forms and hard concretions from 1 to 3 inches in diameter; violently effervescent; moderately alkaline (pH 8.3) gradual wavy boundary. (15 to 50 cm thick)
BCkg2--76 to 152 cm; mixed colors, dark gray (5Y 4/1) and brown (7.5YR 4/2) gravelly clay loam, gray (5Y 5/1) and brown (7.5YR 5/2) dry; massive; hard, firm, moderately sticky and moderately plastic; accumulation of finely disseminated calcium carbonate; 20 percent gravel; moderately alkaline (pH 8.3).
TYPE LOCATION: Lincoln County, Wyoming; on the Auburn road west of the city of Grover approximately 270 feet west and 243 feet south of the bridge across the first slough west of the main channel of the Salt River in sec. 3, T.32N., R.119W.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 1 to 6 degrees C.
Thickness of mollic epipedon - 18 to 48 cm
Depth to calcic horizon - 13 to 50 cm
Depth to seasonal high water table - 0 to 30 cm
Depth to redoxomorphic features - 0 to 30 cm
Note: Vertic features may include cracking and slickensides, and/or have a linear extensibility of 6.0 or more from the surface to a depth of 100 cm.
A, Assg horizons
Hue: 10YR or 2.5Y
Value: 3 or 4 dry; 2 or 3 moist
Chroma: 1 or 2; dry or moist
Texture: silty clay loam or silty clay
Clay content: 18 to 45 percent
Calcium carbonate equivalent: 1 to 10 percent
Reaction: pH 7.9 to 8.4
Bssg horizon
Hue: 7.5YR, 10YR or 2.5Y
Value: 4 to 6 dry; 3 or 4 moist
Chroma: 1 or 2; dry or moist
Texture: silty clay, silty clay loam or clay loam
Clay content: 35 to 50 percent
Rock fragments: 0 to 10 percent gravel
Calcium carbonate equivalent: 5 to 15 percent
Reaction: pH 7.9 to 8.4
Bkg horizon
Hue: 7.5YR, 10YR or 2.5Y
Value: 4 to 6 dry; 3 to 5 moist
Chroma: 1 or 2; dry or moist
Texture: silty clay, silty clay loam or clay loam
Clay content: 35 to 50 percent
Rock fragments: 0 to 25 percent gravel
Calcium carbonate equivalent: 15 to 25 percent
Reaction: pH 7.9 to 8.4
BCkg1 horizon
Hue: 10YR, 2.5Y or 5Y
Value: 5 to 7 dry; 4 to 6 moist
Chroma: 1 or 2; dry or moist
Texture: silty clay, silty clay loam or clay loam
Clay content: 35 to 50 percent
Rock fragments: 0 to 25 percent--0 to 25 percent gravel, 0 to 10 percent cobbles
Calcium carbonate equivalent: 15 to 40 percent
Reaction: pH 7.9 to 8.4
BCkg2 horizon
Hue: 10YR, 2.5Y or 5Y
Value: 5 to 7 dry; 4 to 6 moist
Chroma: 1 or 2; dry or moist
Texture: silty clay, silty clay loam, clay loam or sandy clay loam
Clay content: 30 to 50 percent
Rock fragments: 0 to 35 percent--0 to 35 percent gravel, 0 to 10 percent cobbles
Calcium carbonate equivalent: 10 to 20 percent
Reaction: pH 7.9 to 8.4
COMPETING SERIES:
Egeria (CO) - do not have a calcic horizon
Railway (OR) - do not have a calcic horizon
Silvies (OR) - do not have a calcic horizon
Wetbag (CA) - do not have a calcic horizon
GEOGRAPHIC SETTING:
Landform - flood plains, stream terraces, drainageways, depressional areas and lakebeds
Elevation - 1700 to 2275 meters
Slope - 0 to 8 percent
Parent material - alluvium or lacustrine deposits
Climate - long, cold winters; moist springs; short warm summers
Mean annual precipitation - 380 to 540 mm
Mean annual air temperature - 1 to 6 degrees C.
Frost-free period - 30 to 70 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND PERMEABILITY: Very poorly drained; slow permeability.
USE AND VEGETATION: These soils are used principally as native pastureland, although they are used for native hay crops in some localities. Principal native plants are bluegrass, Dutchclover, sedges, and rushes.
DISTRIBUTION AND EXTENT: Narrows soils are of small extent in eastern Idaho, western Wyoming, and southwestern Montana. MLRAs - 43B, 44B.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana.
SERIES ESTABLISHED: Star Valley Area, Idaho and Wyoming, 1971.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - from 5 to 41 cm (A, Assg, Bssg horizons)
Calcic horizon - from 41 to 76 cm (Bkg, BCkg1 horizons)
Aquic feature - redox concentrations at 18 cm
Vertic subgroup - based on the presence of slickensides and cracking from 18 to 41 cm (Assg, Bssg horizons)
Particle-size control section - from 30 to 105 cm (part of Bssg, Bkg, BCkg1, part of BCkg2 horizons)
Narrows soils have a cryic temperature regime and an aquic moisture regime.
Note: Reclassified from Calcic Cryaquolls to Vertic Cryaquolls - 01/2009.
National Cooperative Soil Survey
U.S.A.