LOCATION STREULING UTEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, carbonatic, frigid Lithic Calcixerolls
TYPICAL PEDON: Streuling very gravelly loam, rangeland. (Colors are for air-dry soil unless otherwise noted.)
The soil surface is covered with 10 percent cobbles and 50 percent gravel.
A--0 to 4 inches; dark brown (10YR 4/3) very gravelly loam, very dark brown (10YR 3/3) moist; weak fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; few medium, common fine and many very fine roots; common medium, many fine and very fine pores; 5 percent cobbles and 20 percent gravel; strongly effervescent, carbonates are disseminated; slightly alkaline (pH 7.8); clear wavy boundary. (3 to 5 inches thick)
Bk1--4 to 10 inches; brown (10YR 5/3) extremely gravelly loam, dark brown (10YR 3/3) moist; weak fine subangular blocky structure; slightly hard, friable, sticky and plastic; few medium, common fine and very fine roots; few medium, common fine and many very fine pores; 65 percent gravel; violently effervescent, carbonates occur in soft masses, as pendants on limestone gravel and disseminated; moderately alkaline (pH 8.2); gradual wavy boundary. (5 to 6 inches thick)
Bk2--10 to 18 inches; light yellowish brown (10YR 6/4) extremely gravelly clay loam, dark yellowish brown (10YR 4/4) moist; moderate medium subangular blocky structure; hard, firm, sticky and plastic; common fine and very fine roots; many fine and very fine pores; 20 percent cobbles and 50 percent gravel; violently effervescent, carbonates occur in soft masses, as pendants on limestone gravel and disseminated; moderately alkaline (pH 8.2); clear wavy boundary. (6 to 9 inches thick)
R--18 inches; limestone bedrock.
TYPE LOCATION: Iron County, Utah; about 0.25 miles east of Arrowhead Pass, about 1,500 feet north and 1,200 feet east of the southwest corner of section 12, T. 31 S., R. 18 W; Steamboat Mtn. Quadrangle; lat. 38 degrees 7 minutes 1 seconds N. and long. 113 degrees 49 minutes 5 seconds W.
RANGE IN CHARACTERISTICS: The mean annual soil temperature at the top of the bedrock ranges from 45 to 47 degrees F. The mean summer soil temperature ranges from 59 to 64 degrees F. The soil moisture regime is xeric bordering on aridic. The soils are dry for 70 to 90 consecutive days per year when the soil temperature is above 8 degrees C.
The soil is 10 to 20 inches deep over limestone bedrock. The thickness of the mollic epipedon 7 to 10 inches thick and the depth to calcic horizon is 3 to 5 inches. Rock fragments are mainly limestone and average 45 to 70 percent in the particle size control section which is dominanted by gravel and cobbles. Clay content in the particle size control section averages 27 to 35 percent. The calcium carbonate equivalent is 40 to 60 percent in the particle size control section, including coarse fragments less than 20 millimeters.
The A horizon has value of 3 to 5 dry and 2 or 3 moist, and chroma of 2 or 3. Texture is a very gravelly loam or extremely gravelly loam. It is neutral to slightly alkaline and is slightly effervescent to strongly effervescent. Calcium carbonate equivalent is 10 to 40 percent.
The Bk horizon has value of 5 to 7 dry and 3 to 5 moist, and chroma of 3 or 4. Texture is extremely gravelly loam, very gravelly loam, extremely gravelly clay loam or very gravelly clay loam. Calcium carbonate equivalent is 40 to 60 percent. It is slightly alkaline to strongly alkaline and is strongly to violently effervescent. Rock fragment content is 45 to 70 percent gravel and 0 to 20 percent cobbles.
COMPETING SERIES: These are the Amene (NV), Lundy (UT), and Monarch (T) (NV) series. Amene soils have an aridic soil moisture regime with the moisture control section dry in all parts for more than 90 consecutive days when the soil temperature is above 8 degrees C. Lundy soils have a typic xeric soil moisture regime with the soil moisture control section dry in all parts for 45 to 70 consecutive days when the soil temperature is above 8 degrees C. Monarch soils have clay content less than 18 percent in the partricle size control section and have a mollic epipedon that is 10 to 20 inches thick.
GEOGRAPHIC SETTING: Streuling soils are on foothills and mountainsides at elevations of 7,100 to 8,200 feet. Slopes range from 15 to 50 percent. They formed in colluvium and residuum from limestone. The average annual precipitation ranges from 12 to 16 inches. Mean annual air temperature ranges from 43 to 45 degrees F. and the freeze free period is 70 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Fontreen and Itca soils. Fontreen soils are very deep. Itca soils are clayey skeletal.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderate permeability.
USE AND VEGETATION: These soils are used for range. Important plants are Utah juniper, pinyon with an understory of bluebunch wheatgrass and black sagebrush.
DISTRIBUTION AND EXTENT: Southwestern Utah. MLRA 28A. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Iron-Washington Area Soil Survey; Iron County, Utah, 1997.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the surface of the soil to 10 inches (A and Bk1 horizons).
Calcic horizon - the zone of calcium carbonate accumulation from a depth of 4 inches to 18 inches (Bk1 and Bk2 horizons).
Lithic feature - bedrock at 18 inches (R horizon).
The classification is based on the "Keys to Soil Taxonomy, Eighth Edition, 1998".