LOCATION ROZLEE UTEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, active, mesic Aridic Calcixerolls
TYPICAL PEDON: Rozlee cobbly silt loam--rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 8 inches; grayish brown (10YR 5/2) cobbly silt loam, very dark grayish brown (10YR 3/2) moist; moderate fine granular structure; soft, friable, slightly sticky and slightly plastic; common fine and few medium roots; 35 percent cobble and gravel; slightly calcareous; strongly alkaline (pH 8.5); gradual smooth boundary. (7 to 16 inches thick)
Bw--8 to 18 inches; brown (10YR 5/3) very cobbly silt loam, dark grayish brown (10YR 4/2) moist weak medium and fine subangular blocky structure; soft, friable, slightly sticky and slightly plastic; common fine roots; 50 percent cobble and gravel; moderately calcareous; strongly alkaline (pH 8.5); gradual irregular boundary. (4 to 12 inches thick)
Bk--18 to 30 inches; pale brown (10YR 6/3) very cobbly silt loam, brown (10YR 5/3) moist; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few fine roots; 55 percent cobble and gravel; strongly calcareous; strongly alkaline (pH 8.5); abrupt irregular boundary. (10 to 19 inches thick)
R--30 inches; fractured limestone bedrock with lime accumulations in the cracks.
TYPE LOCATION: Box Elder County, Utah; 16 miles south of Golden Spike National Monument; 800 feet east and 800 feet north of SW corner sec. 27, T.8N., R.6W.
RANGE IN CHARACTERISTICS: The mean annual soil temperature at 20 inches is 48 to 52 degrees F., and the average summer temperature is 68 to 72 F. The moisture control section is dry for more than half of the time when the soil temperature at 20 inches is above 41 F. They are moist for 60 to 90 consecutive days during the winter months, but are dry for 60 to 90 consecutive days during the summer months.
The mollic epipedon is 7 to 16 inches thick. Depth to the Bk horizon is 11 to 23 inches and depth to bedrock (lithic contact) is 20 to 40 inches. Coarse fragments are angular cobbles, gravel, and a few stones derived mostly from limestone, but with some sandstone and quartzite present. Coarse fragments generally increase in amount with depth, and range from 20 to 35 percent in the A horizon, 40 to 70 percent in the Bw horizon, and 50 to 80 percent in the Bk horizon. Most of the coarse fragments are more than 20 mm. in diameter.
The A horizon has value of 4 or 5 dry, 2 or 3 moist, and chroma of 2 or 3. It is slightly alkaline to strongly alkaline, and slightly to moderately calcareous.
The Bw horizon has hue of 10YR and occasionally 7.5YR, value of 5 dry and 3 moist with chroma of 4, or value of 6 dry, and 4 moist with chroma of 2 through 4. It is very cobbly and/or gravelly, silt loam or loam. It is moderately to strongly alkaline, and slightly to strongly calcareous.
The Bk horizon has value of 5 through 7 dry, 4 through 6 moist, and chroma of 2 through 4. It is very cobbly or gravelly loam or silt loam. It is moderately to strongly alkaline.
COMPETING SERIES: These are the Abela, Bezzant, Broad, DeJarnet, Hupp, Middle, Munk, Pharo, Sandall, and Saxby series. Abela, Hupp, DeJarnet, and Pharo soils are more than 40 inches deep to bedrock. Bezzant and Broad soils have mean annual temperatures of less than 47 degrees F. Broad, DeJarnet, Hupp, and Middle soils are noncalcareous in at least the surface 7 inches. DeJarnet soils have mollic epipedons more than 20 inches thick. Sandall and Saxby soils lack mollic epipedons.
GEOGRAPHIC SETTING: Rozlee soils occur on very steep mountain slopes, usually north facing. They formed in residuum and colluvium derived mostly from limestone, but have some sandstone and quartzite parent rock. They are in a dry, subhumid climate with an average annual precipitation of 13 to 14 inches. The mean annual temperature is about 45 to 48 F. and the mean summer temperature is about 72 F. The frost-free period is about 100 to 130 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Abela, Hupp, and Sandall soils and the Promo soils. Promo soils have a lithic contact within 20 inches and lack mollic epipedons.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderately rapid permeability.
USE AND VEGETATION: Used mainly for rangeland and watershed. Vegetation is dominantly bluebunch wheatgrass, big sagebrush, bitterbrush, yellowbrush, cheatgrass, and some juniper.
DISTRIBUTION AND EXTENT: Northern Utah mountain areas at the south end of Howell Valley and southward on the Promontory Mountains. These soils are moderately extensive. MLRAs 28A and 47.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona.
SERIES ESTABLISHED: Box Elder County (East Box Elder Area), Utah, 1969.
REMARKS: The active cation exchange activity class was added to the taxonomic classification in December 2002 based on soil property data. The remainder of this document has not been completely updated.