LOCATION MARRIOTT UTEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, active, mesic Calcic Haploxerolls
TYPICAL PEDON: Marriott gravelly sandy loam--rangeland. (Colors are for dry soil unless otherwise noted.)
A1--0 to 2 inches; very dark brown (10YR 2/2) moist; weak fine and medium granular structure; soft, very friable; many fine roots; few fine pores: slightly alkaline (pH 7.4); clear smooth boundary. (1 to 3 inches thick.)
A2--2 to 8 inches; brown (10YR 4/3) gravelly fine sandy loam, dark brown (7.5YR 3/3) moist; weak fine granular and fine subangular blocky structure; slightly hard, friable, slightly sticky; many fine roots; few fine pores; slightly alkaline (pH 7.6); clear smooth boundary. (4 to 8 inches thick.)
Bw1--8 to 11 inches; brown (7.5YR 5/4) gravelly fine sandy loam, brown (7.5YR 4/3) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky; few fine roots; few fine pores; slightly alkaline (pH 7.4); clear smooth boundary. (3 to 7 inches thick.)
Bw2-- 11 to 22 inches; brown (7.5YR 5/4) gravelly fine sandy loam, brown (7.5YR 4/4) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky; few fine roots; few fine and medium pores; slightly calcareous; slightly alkaline (pH 7.6); clear smooth boundary. (4 to 12 inches thick.)
Bk--22 to 61 inches; light brown (7.5YR 6/4) gravelly fine sandy loam, brown (7.5YR 5/4) moist; massive; soft, very friable; few fine roots; few fine and medium pores; moderately calcareous, slightly alkaline (pH 7.7).
TYPE LOCATION: Weber County, Utah; 1/8 mile west and 1/4 mile north from Riverdale School west of road; about 950 feet west and 900 feet north from the east 1/4 corner of section 12, T. 5 N., R. 2 W.
RANGE IN CHARACTERISTICS:
The soil is neutral or slightly alkaline throughout. The Al horizon has hues of 10YR or 7.5YR, values of 2 or 3 moist and 4 or 5 dry, and chroma of 2 or 3. The A horizon is gravelly sandy loam or cobbly sandy loam. It is commonly noncalcareous but soils having slightly calcareous A horizons are within the range of the series. Content of pebbles and cobbles ranges from 15 to 40 percent by volume. Content of organic matter ranges from 1 to 2.5 percent.
The Bw horizons have hue of 7.5YR or 10YR, value of 5 or 6 dry and 4 or 5 moist, and chroma of 3 through 6. The 10 to 40 inch control section averages gravelly fine sandy loam in texture and it contains from 20 to 50 percent pebbles and cobbles.
The Bk horizon has hue of 7.5YR or 10YR, value of 5 through 7 dry and 4 or 5 moist, and chroma of 3 through 6. The Bk horizon ranges in texture from gravelly fine sandy loam to gravelly loamy fine sand. It contains from 15 to 50 percent coarse fragments mostly pebbles and small cobbles. The lower part of the horizon is moderately calcareous; calcium carbonate equivalent ranges from 4 to 10 percent.
COMPETING SERIES: There are currently no other series in this family.
GEOGRAPHIC SETTING: Marriott soils are on east and south-facing sideslopes or risers of deltas and stream terraces. Slopes are 15 to 60 percent. These soils formed in alluvium and colluvium derived dominantly from quartzite, sandstone, granite, and some limestone. The climate is dry subhumid and the mean annual precipitation ranges from 16 to 19 inches. The mean annual temperature is 47 to 52 degrees F., the mean summer temperature is 68 to 72 degrees F., and the frost-free period is 130 to 175 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Hillfield, Kilburn, Preston, and Steed soils. Hillfield and Preston soils lack mollic epipedons and are not gravelly or cobbly in the control section. Steed soils have sand control sections that are very cobbly or very gravelly.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; Runoff is slow to rapid; permeability is moderately rapid to rapid.
USE AND VEGETATION: Marriott soils are used mainly as rangeland. A few areas are used for irrigated orchards. The native vegetation is mainly sand dropseed, Indian ricegrass, three-awn grass, cheatgrass, big sagebrush and annual weeds.
DISTRIBUTION AND EXTENT: Northern Utah. These soils are not extensive. MLRA 28A.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona.
SERIES ESTABLISHED: Weber County (Davis-Weber Area), Utah, 1967.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the soil surface to 8 inches (A1 and A2 horizons).
Cambic horizon - The zone from 8 to 22 inches (Bw1 and Bw2 horizons).
Identifiable secondary carbonates - The zone from 22 to 61 inches (Bk horizon).
Particle-size control section - The zone from 10 to 40 inches (Bw2 horizon and parts of the Bw1 and Bk horizons).
The active cation exchange activity class was added to the taxonomic classification in December 2002 based on soil property data. Other edits were made at this time, but the entire document has not been completely updated.