LOCATION POVERTYFLAT UTTentative Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Calciargidic Argixerolls
TYPICAL PEDON: Povertyflat extremely stony coarse sandy loam - rangeland, on a northwest-facing, 10 percent slope at an elevation of 1695 m. (Colors are for dry soil unless otherwise noted.) The surface is covered by 35 percent gravel, 10 percent cobbles, and 5 percent stones.
A--0 to 8 cm; dark grayish brown (10YR 4/2) extremely stony coarse sandy loam, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; common fine roots; few medium and many very fine pores; 35 percent gravel, 20 percent cobbles, and 15 percent stones; noneffervescent; moderately alkaline (pH 8.1); abrupt smooth boundary. (10 to 17 cm thick.)
Bt1--8 to 13 cm; brown (7.5YR 4/2) very cobbly loam, dark brown (7.5YR 3/2), moist; weak fine subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common fine and few medium roots; few fine and common very fine pores; common distinct clay films; 21 percent gravel, 20 percent cobbles and 2 percent stones; noneffervescent; moderately alkaline (pH 8.1); abrupt smooth boundary.
Bt2--13 to 28 cm; brown (7.5YR 5/3) extremely gravelly clay loam, dark brown (7.5YR 3/3), moist; weak fine subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common fine and few medium roots; few fine and common very fine pores; common distinct clay films; 54 percent gravel, 20 percent cobbles and 2 percent stones; noneffervescent; moderately alkaline (pH 8.0); clear smooth boundary. (Combined thickness of Bt horizons is 10 to 25 cm).
Bk1--28 to 48 cm; brown (7.5YR 5/2) extremely gravelly coarse sandy loam, brown (7.5YR 4/2), moist; weak fine subangular blocky structure; hard, firm, moderately sticky and moderately plastic; few fine and medium roots; few fine pores; few faint clay films; 5 percent soft carbonate masses lining pores and ped faces, carbonate pendants on bottoms of rock fragments; 60 percent gravel, 20 percent cobbles and 2 percent stones; slightly effervescent; moderately alkaline (pH 8.2); clear smooth boundary.
Bk2--48 to 76 cm; pinkish gray (7.5YR 6/2) extremely gravelly coarse sandy loam, brown (7.5YR 4/2), moist; massive; slightly hard, friable, moderately sticky and slightly plastic; few fine and medium roots; few very fine and fine pores; 10 percent soft carbonate masses in matrix, carbonate pendants on bottoms of rock fragments; 51 percent gravel, 25 percent cobbles and 2 percent stones; slightly effervescent; strongly alkaline (pH 8.5); gradual wavy boundary.
Bk3--76 to 132 cm; pinkish gray (7.5YR 6/2) extremely gravelly coarse sandy loam, brown (7.5YR 4/2), moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few fine and medium roots; few very fine and fine pores; 5 percent soft carbonate masses on faces of peds, carbonate pendants on bottoms of rock fragments; 45 percent gravel, 20 percent cobbles and 2 percent stones; strongly effervescent; strongly alkaline (pH 8.6).
TYPE LOCATION: Sevier County, Utah; about 2.5 miles south of Monroe; located about 150 feet south and 350 feet west of the center of sec. 27, T. 25 S. , R. 3 W.; Monroe Peak USGS quad; 402741 E 4272503 N UTM zone 12, NAD 83.; latitude 38 degrees 35 minutes 44.5 seconds N and longitude 112 degrees 7 minutes 0.6 seconds W; NAD 83.
RANGE IN CHARACTERISTICS:
Soil moisture: Usually dry; moist in winter and spring and for brief periods in late summer due to convection storms: aridic bordering on xeric soil moisture regime
Mean annual soil temperature: 9.0 to 12 degrees C.
Thickness of the mollic epipedon: 18 to 30 cm.
Depth to base of argillic horizon: 30 to 70 cm.
Depth to calcic horizon: 30 to 60 cm.
Depth to secondary carbonates: 28 to 45 cm.
Stage I to Stage II carbonate morphogenetic stages.
Particle-size control section - Clay content: 25 to 35 percent.
Rock fragments: 35 to 75 percent; lithology of fragments is andesite or rhyolite.
A horizon
Hue: 10YR or 7.5YR.
Value: 4 or 5 dry.
Chroma: 2 or 3.
Effervescence: Noneffervescent or very slightly effervescent.
Reaction: Slightly alkaline or moderately alkaline.
Bt horizons
Hue: 10YR or 7.5YR.
Value: 3 or 4 moist, 4 or 5 dry.
Chroma: 2 to 4.
Texture: Loam or clay loam.
Clay content: 25 to 35 percent.
Rock fragments: 35 to 75 percent, mainly gravel and cobbles; texture modifiers include very cobbly, very gravelly, extremely gravelly and extremely cobbly. Effervescence: Noneffervescent through slightly effervescent.
Reaction: Slightly alkaline or moderately alkaline.
Btk horizon (when present)
Hue: 10YR or 7.5YR.
Value: 4 to 6 dry.
Chroma: 2 to 4.
Texture: Loam or clay loam.
Clay content: 20 to 28 percent.
Rock fragments: 35 to 75 percent, mainly gravel and cobbles; texture modifiers include very cobbly, very gravelly, extremely gravelly and extremely cobbly. Calcium carbonate equivalent: 5 to 15 percent.
Effervescence: Slightly effervescent or strongly effervescent.
Bk horizons
Hue: 10YR or 7.5YR
Value: 5 to 7, dry; 4 or 5 moist.
Chroma: 2 or 3.
Texture: Sandy loam, coarse sandy loam or loam.
Clay content: 12 to 20 percent
Rock fragments: 35 to 80 percent, mainly gravel and cobbles; texture modifiers include very cobbly, very gravelly, extremely gravelly and extremely cobbly.
Calcium carbonate equivalent: 5 to 15 percent
Effervescence: Slightly effervescent to violently effervescent; 5 to 20 percent carbonate masses and nodules.
Reaction: Moderately alkaline or strongly alkaline.
COMPETING SERIES: These are the Belmill, Kancan, Mountainville, Pagari, Selti, and Walsey series. Belmill series has secondary silica accumulations.
Kancan soils have estimated mean annual soil temperature less than 9.5 degrees C and have two or more diagnostic discontinuities. Mountainville soils have predominantly stones in the control section and lithology of the fragments is sandstone, quartzite, and limestone. Pagari soils have basalt bedrock at depths of 100 to 150 cm. Selti soils have 18 to 25 percent clay in the control section and lithology of the fragments is quartzite or quartz mononite. Walsey soils are moderately deep to weathered basalt.
GEOGRAPHIC SETTING:
Parent material: Alluvium, slope alluvium and colluvium derived from rhyolite and andesite.
Landform: Fan remnants.
Slopes: 3 to 35 percent.
Elevation: 1,650 to 2,170 meters.
Mean annual temperature: 8 to 10.5 degrees C.
Mean annual precipitation: 200 to 300 mm.
Frost-free period: 100 to 140 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Monroe, Hoye, Annabella and Hiko Peak series. Monroe soils have less than 35 percent rock fragments in the control section. Hoye soils have fine-loamy control sections and ochric epipedons. Hiko Peak and Annabella soils do not have ochric epipedons and do not have argillic horizons.
DRAINAGE AND PERMEABILITY: Well drained; slow to rapid runoff; moderate to moderately slow permeability; moderately high saturated hydraulic conductivity class.
USE AND VEGETATION: These soils are used for rangeland and some cropland. Potential vegetation consists of Wyoming big sagebrush, bottlebrush squirrel tail, bluebunch wheatgrass, prickly pear, Sandberg bluegrass. Ecological site: Semidesert Gravelly Loam (Wyoming Big Sage) 028AY215UT.
DISTRIBUTION AND EXTENT: Central Utah, MLRA 28A; This soil is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES PROPOSED: Sevier County, Utah, 2009.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon: The zone from 0 to 28 cm. (A, Bt1, Bt2 horizons).
Calcic horizon: The zone from 48 to 132 cm. (Bk2, Bk3 horizons).
Particle-size control section: The zone from 8 to 28 cm. (Bt1, Bt2 horizons).
The assignment of the cation-exchange activity class is supported by lab data.
Taxonomic Version: 10th edition
ADDITIONAL DATA: National Soil Survey Laboratory pedon number 40A3767, pedon ID 75UT041005 (sampled as Red Butte) is available for the current type location.