LOCATION STRETH WY
Tentative Series
IRD DJP-CBR
03/2018
STRETH SERIES
The Streth series consists of moderately deep, well drained soils that formed in slope alluvium over residuum derived from calcareous sandstone. These soils are on cuestas. Slopes are 1 to 15 percent. Mean annual precipitation is about 450 mm, and mean annual air temperature is about 1.2 degrees C.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Ustic Calcicryepts
TYPICAL PEDON: Streth gravelly loam, in rangeland (colors are for dry soil unless otherwise noted).
A--0 to 5 cm; brown (10YR 5/3) gravelly loam, dark grayish brown (10YR 4/2) moist; moderate very fine granular structure; soft, very friable, slightly sticky, slightly plastic; many fine and very fine roots throughout; many fine and very fine irregular pores; 30 percent gravel; slightly effervescent; moderately alkaline (pH 8.0); clear wavy boundary. (4 to 8 cm thick)
Bk1--5 to 33 cm; dark yellowish brown (10YR 4/4) gravelly loam, dark brown (10YR 3/3) moist; weak coarse subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; many very fine roots throughout; many fine and very fine irregular pores; 20 percent gravel; 15 percent calcium carbonate coats on bottom surfaces of rock fragments; 5 percent threadlike calcium carbonate masses on surfaces along root channels; strongly effervescent; 13 percent calcium carbonate equivalent; moderately alkaline (pH 8.2); abrupt wavy boundary. (24 to 30 cm thick)
Bk2--33 to 58 cm; very pale brown (10YR 8/3) gravelly loam, very pale brown (10YR 7/4) moist; weak medium subangular blocky structure; moderately hard, firm, slightly sticky, slightly plastic; common very fine roots throughout; common very fine tubular pores; 20 percent gravel; 10 percent calcium carbonate coats on bottom surfaces of rock fragments; 10 percent calcium carbonate masses in matrix; strongly effervescent; 20 percent calcium carbonate equivalent; moderately alkaline (pH 8.4); abrupt wavy boundary. (20 to 30 cm thick)
R--58 cm; sandstone bedrock
TYPE LOCATION: Lincoln County, Wyoming; USGS Kemmerer Reservoir, Wyoming, topographic quadrangle; 41 degrees 54 minutes 20.00 seconds north latitude and 110 degrees 40 minutes 8.90 seconds west longitude, datum WGS84.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature -- 1.6 to 3.1 degrees C.
Depth to calcic horizon -- 25 to 45 cm
Depth to lithic contact -- 50 to 100 cm
Particle-size control section (weighted averages)
Clay content -- 18 to 26 percent
Total Rock fragments -- 10 to 25 percent
A horizon
Hue: 7.5YR or 10YR, dry or moist
Value: 4 or 5 dry; 3 or 4 moist
Chroma: 2 or 3, dry or moist
Clay content: 18 to 26 percent
Rock fragments: 15 to 30 percent gravel
Reaction: pH 7.8 to 8.2
Bk1 horizon
Hue: 7.5YR or 10YR, dry or moist
Value: 3 or 4, dry or moist
Chroma: 3 or 4, dry or moist
Clay content: 18 to 26 percent
Rock fragments: 10 to 25 percent gravel
Calcium carbonate equivalent: 5 to 15 percent
Reaction: pH 7.8 to 8.4
Bk2 horizon
Hue: 10YR or 2.5Y, dry or moist
Value: 7 or 8, dry or moist
Chroma: 1 to 3 dry; 3 or 4 moist
Clay content: 18 to 26 percent
Rock fragments: 10 to 25 percent gravel
Calcium carbonate equivalent: 15 to 25 percent
Reaction: pH 8.2 to 8.6
COMPETING SERIES:
Kenosha (CO) -- soils are moderately deep to paralithic contact
Knep (MT) -- soils are moderately deep to paralithic contact
Lyonsbridge (MT) -- soils are very deep
GEOGRAPHIC SETTING:
Landform -- cuestas
Elevation -- 2,200 to 2,510 meters
Slope -- 1 to 15 percent
Parent material -- slope alluvium over residuum derived from calcareous sandstone
Climate -- long, cold winters; cool, moist springs; short, cool summers
Mean annual precipitation -- 375 to 575 mm with peak periods of precipitation occurring during the spring
Mean annual air temperature -- 0.6 to 2.1 degrees C.
Frost-free period -- 15 to 45 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained, 5.0 to 15.0 um/sec.
USE AND VEGETATION: Streth soils are primarily used for rangeland. The potential native vegetation is Wyoming big sagebrush, bottlebrush squirreltail, thickspike wheatgrass and needle and thread.
DISTRIBUTION AND EXTENT: Streth soils are of small extent in southwestern Wyoming. MLRA 34A and 46.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Lincoln County, Wyoming, 2018. The name is derived from a local landmark.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon -- 0 to 5 cm (A horizon)
Calcic horizon -- 33 to 58 cm (Bk2 horizon)
Lithic contact -- 58 cm (R horizon)
Particle-size control section -- 25 to 58 cm (part of the Bk1 and Bk2 horizons)
Streth soils have a cryic temperature regime and an ustic moisture regime.
Taxonomic version: Twelfth edition, 2014
National Cooperative Soil Survey
U.S.A.