LOCATION JURA UTEstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Typic Haplotorrerts
TYPICAL PEDON: Jura clay, on a level area under alfalfa at an elevation of 1,615 m. (Colors are for dry soil unless otherwise noted). When described on April 22, 2008, the soil had cracks 1 to 5 cm wide extending from the surface to a depth of 82 cm.
Ap--0 to 12 cm; pinkish gray (7.5YR 6/2) clay, dark brown (7.5YR 3/2) moist; strong coarse prismatic parting to strong thin platy structure; extremely hard, very firm, moderately sticky and very plastic; common coarse, medium, fine and very fine roots; common very coarse high continuity pores; slightly effervescent; moderately alkaline (pH 8.2); clear smooth boundary. (6 to 18 cm thick)
Bss--12 to 52 cm; pinkish gray (7.5YR 6/2) clay, brown (7.5YR 4/2) moist; strong coarse prismatic parting to strong medium angular blocky structure; extremely hard, very firm, moderately sticky and very plastic; common coarse, medium, fine and very fine roots; common very coarse high continuity pores; few continuous prominent slickensides (pedogenic) on vertical faces of peds; slightly effervescent; moderately alkaline (pH 8.2); gradual wavy boundary. (30 to 60 cm thick)
Bkss1--52 to 82 cm; pinkish gray (7.5YR 7/2) clay, brown (7.5YR 4/2) moist; strong medium prismatic structure parting to strong medium angular blocky structure; extremely hard, very firm, moderately sticky and very plastic; common coarse, medium, fine and very fine roots; common very coarse high continuity pores; common continuous prominent slickensides (pedogenic) on vertical faces of peds; common carbonate masses; strongly effervescent; moderately alkaline (pH 8.2); gradual wavy boundary. (20 to 50 cm thick)
Bkss2--82 to 108 cm; pinkish gray (7.5YR 7/2) clay, brown (7.5YR 4/2) moist; strong coarse wedge structure; extremely hard, very firm, moderately sticky and very plastic; common coarse, medium, fine and very fine roots; common very coarse high continuity pores; common continuous prominent slickensides (pedogenic) on faces of peds; 3 percent masses of oxidized iron; common carbonate masses; strongly effervescent; moderately alkaline (pH 8.0); gradual smooth boundary. (20 to 50 cm thick)
Bkss3--108 to 140 cm; pinkish gray (7.5YR 7/2) clay, brown (7.5YR 4/2) moist; strong medium wedge structure; extremely hard, very firm, moderately sticky and very plastic; common coarse, medium, fine and very fine roots; common coarse moderate continuity pores; common discontinuous prominent slickensides (pedogenic) on faces of peds; 2 percent manganese masses and 10 percent masses of oxidized iron; common carbonate masses; slightly effervescent; slightly alkaline (pH 7.8); gradual smooth boundary. (0 to 50 cm thick)
C--140 to 151 cm; pinkish gray (7.5YR 7/2) clay, brown (7.5YR 4/3) moist; extremely hard, very firm, moderately sticky and moderately plastic; common fine roots; 2 percent manganese masses and 10 percent masses of oxidized iron; few carbonate masses; slightly effervescent; moderately alkaline (pH 8.0).
TYPE LOCATION: Sevier County, Utah; 1 mile north and 0.25 mile east of Monroe; located at the center of Section 3, Township 25 S., Range 3 W.; USGS Annabella 7.5 minute quadrangle; latitude 38 degrees 39 minutes 12 seconds N and longitude 112 degrees 6 minutes 58 seconds W; NAD 83.
RANGE IN CHARACTERISTICS:
Soil moisture: These soils are usually dry, moist in winter and spring and for brief periods in late summer due to convection storms; aridic bordering xeric soil moisture regime.
Mean annual soil temperature: 9.0 to 12.0 degrees C.
Depth to 2C horizons (when present): 100 to 150 cm.
Other features: Cracks that open and close periodically.
Particle-size control section Clay content: 45 to 60 percent.
Sand content: 5 to 10 percent.
Ap horizon
Hue: 7.5YR or 10YR.
Value: 5 or 6 dry and 3 to 5 moist.
Chroma: 1 to 4 dry and 2 to 4 moist.
Reaction: Moderately alkaline or strongly alkaline.
Bss and Bkss horizons
Hue: 7.5YR or 10YR.
Value: 5 to 7 dry and 3 to 5 moist.
Chroma: 1 to 4 dry and 2 to 4 moist.
Clay content: 45 to 60 percent.
Calcium carbonate equivalent: 1 to 5 percent.
Electrical conductivity: 0 to 4 mmhos/cm.
Gypsum: 0 to 2 percent.
Sodium adsorption ratio (SAR): 3 to 10.
Reaction: Slightly alkaline or moderately alkaline.
C horizons
Hue: 7.5YR or 10YR.
Value: 5 or 6 dry and 4 or 5 moist.
Chroma: 3 or 4.
Texture: Clay.
Calcium carbonate equivalent: 1 to 5 percent.
Electrical conductivity (EC): 0 to 4 mmhos/cm.
Gypsum: 0 to 1 percent.
Sodium adsorption ratio (SAR): 5 to 13.
2C horizon (when present):
Hue: 7.5YR or 10YR.
Value: 5 or 6 dry and 4 or 5 moist.
Chroma: 3 or 4 dry or moist.
Texture: Silt loam, fine sandy loam, sandy loam, loamy sand, sand, coarse sand.
Rock fragments: 0 to 25 percent fine gravel.
Calcium carbonate equivalent: 1 to 5 percent.
Electrical conductivity (EC): 0 to 4 mmhos/cm.
Gypsum: 0 to 1 percent
Sodium adsorption ratio (SAR): 5 to 13
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Jura soils formed in alluvium from igneous and sedimentary rocks. The Jura soils are on alluvial flats and basin floors. Slopes range from 0 to 1 percent. Elevations are 1,610 to 1,660 meters. The mean annual precipitation is 200 to 300 mm. The mean annual temperature is 8.0 to 10.5 degrees C and the frost-free period is 100 to 140 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Genola, Glenwood, Monroe, Okerland and Woodrow soils. Genola and Woodrow soils are fine-silty in the particle-size control section. Glenwood soils are coarse-loamy over sandy or sandy-skeletal in the particle-size control section. Monroe and Okerland soils are fine-loamy in the particle-size control section.
DRAINAGE AND PERMEABILITY: Well drained, runoff is negligible, slow and very slow permeability; moderately low saturated hydraulic conductivity.
USE AND VEGETATION: Most areas of the Jura series are used for irrigated cropland. Principal crops are alfalfa, small grains, and silage corn. Other uses include wildlife habitat and irrigated pasture.
DISTRIBUTION AND EXTENT: Central Utah. MLRA 28A. The series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona.
SERIES ESTABLISHED: Richfield Area, Utah, 1947.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from the soil surface to 18 cm (Ap and part of the Bss horizons).
Vertic features - Slickensides in the zone from 12 to 140 cm (Bss, Bkss horizons).
Particle-size control section - The zone from 25 to 100 cm (Bkss and part of Bss and Bkss horizons).
The type location was changed in June 2009, with subsequent concept change from the very-fine to fine particle-size class.
Taxonomic Version: Classified according to Keys to Soil Taxonomy, Tenth Edition, 2006.
ADDITIONAL DATA: Sample 91P117 from Sevier County, Utah; sample by the National Soil Survey Laboratory, Lincoln, NE, 9/91.