LOCATION POPOSHIA WY+UTEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Ustic Haplocambids
TYPICAL PEDON: Poposhia loam on southwest-facing convex slope of 3 percent-native range. (Colors are for dry soil unless otherwise stated.)
A--0 to 3 inches; brown (10YR 5/3) loam, brown (10YR 4/3) moist; weak fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic many very fine, fine and few medium roots; slightly effervescent, carbonates disseminated; moderately alkaline (pH 8.0); abrupt smooth boundary. (2 to 8 inches thick)
Bk--3 to 15 inches; pale brown (10YR 6/3) clay loam, light olive brown (2.5Y 5/4) moist; weak medium prismatic structure; hard, firm, moderately sticky and moderately plastic; common very fine, fine, and few medium roots; slightly effervescent, carbonates disseminated and as few fine threads and seams; moderately alkaline (pH 8.2); clear wavy boundary. (6 to 20 inches thick)
C--15 to 60 inches; pale brown (10YR 6/3) loam, light olive brown (2.5Y 5/4) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few very fine, fine and medium roots to 22 inches; slightly effervescent, carbonates disseminated; moderately alkaline (pH 8.0).
TYPE LOCATION: Fremont County, Wyoming, about 5.8 miles south and 2.9 east of Hudson; 800 feet east, 2,975 feet south of the NW corner of sec. 23, T. 33 N., R. 98 W.
RANGE IN CHARACTERISTICS:
Soil moisture: The soil moisture control section is usually dry, but is moist in some parts for 30 to 50 cumulative days between June 10 and October 10; and is moist 50 to 65 percent of the time when the soil temperature is above 5 deg. C.; aridic regime bordering ustic.
Mean annual soil temperature: 42 to 47 degrees F.
Mean summer temperature: 59 to about 63 degrees F.
Depth to cambic horizon: 2 to 8 inches
The soil is typically calcareous throughout but may be leached a few inches in some pedons.
Particle-size control section: is loam, clay loam, or sandy clay loam with 18 to 35 percent clay, 20 to 50 percent silt, and 20 to 55 percent sand
A horizon:
Hue: 7.5YR through 2.5Y
Value: 4 through 7 dry, 3 through 5 moist
Chroma: 2 through 4 dry or moist
EC: 1 to 4 mmhos.
Rock fragments: 0 to 15 percent
Reaction: is slightly through strongly alkaline
Bk horizon:
Hue: 7.5YR through 2.5Y
Value: 5 through 8 dry, 4 through 6 moist
Chroma: 2 through 4 dry
Texture: loam, clay loam, and less commonly sandy clay loam
Rock fragments: 0 to 20 percent
Calcium carbonate equivalent: 4 to 14 percent
EC: 1 to 8 mmhos
Reaction: slightly through strongly alkaline
C horizon
Hue: 7.5YR through 2.5Y
Value: 5 through 7 dry, 4 through 6 moist
Chroma: 2 through 4 dry or moist
Texture: loam, clay loam, or sandy clay loam
Rock fragments: 0 to 20 percent
EC: 1 to 8 mmhos
Reaction: moderately or strongly alkaline
COMPETING SERIES: These are the
Chaperton,
Piceance, and
Yamo series.
Chaperton: have a paralithic contact between 20 and 40 inches deep
Piceance: have a lithic contact between 20 and 40 inches deep
Yamo: have soil moisture control sections that are drier during the months of
May and June
GEOGRAPHIC SETTING:
Parent material: alluvium and slope alluvium derived from shale interbedded with sandstone
Landform: gently sloping and moderately sloping coalescing fans, footslopes, hillslopes, and terraces
Slopes: 0 to 30 percent
Elevation: 5,200 to 7,800 feet
Mean annual temperature: 39 to 45 degrees F.
Mean annual precipitation: 8 to 15 inches
Frost-free period: 85 to 120 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Absher, Blackhall, Blazon, Diamondville, Ryan Park, Tisworth, and the competing Delphill and Sinkson soils. Absher and Tisworth soils have a natric horizon. Blackhall, Blazon, and Diamondville soils have bedrock above 40 inches. Ryan Park soils are coarse-loamy. Diamondville and Ryan Park soils have argillic horizons.
DRAINAGE AND PERMEABILITY: Well drained; runoff is slow or medium; permeability is moderate.
USE AND VEGETATION: Mainly native range but some is used for irrigated small grain, hay, and pasture. Native vegetation is western wheatgrass, big sagebrush, Canby bluegrass, sheep fescue, needleandthread, and some annual forbs (mustards). Poposhia soils are mainly correlated to ecological sites in the 10 to 14 inch zone in Wyoming. At the type location the potential native vegetation is mainly big sagebrush, thickspike wheatgrass, green needlegrass, bluebunch wheatgrass, and bottlebrush squirreltail.
DISTRIBUTION AND EXTENT: Southern and western Wyoming. The series is moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Fremont County, Wyoming, East Part; 1985.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - 0 to 3 inches (A)
Cambic horizon - 3 to 15 inches (Bk)
Secondary calcium carbonate - 3 to 15 inches (Bk)
Classification was changed from Ustic Torriorthents to Ustic Haplocambids 5/1999.
Taxonomic version: Tenth Edition, 2006.