LOCATION TRAIL AZ+NM UTEstablished Series
TAXONOMIC CLASS: Sandy, mixed, mesic Typic Torrifluvents
TYPICAL PEDON: Trail loamy sand - rangeland. (Colors are for dry soil unless otherwise noted)
A--0 to 3 inches; light brown (7.5YR 6/4) loamy sand, brown (7.5YR 5/4) moist; single grain; loose, nonsticky and nonplastic; many very fine roots; many fine irregular pores; noneffervescent; moderately alkaline (pH 8.2); abrupt wavy boundary. (2 to 5 inches thick)
C1--3 to 20 inches; light brown (7.5YR 6/4) stratified loamy sand, brown (7.5YR 5/4) moist; massive; slightly hard, very friable, nonsticky and nonplastic; many very fine roots; many fine irregular pores; slightly effervescent; moderately alkaline (pH 8.2); abrupt wavy boundary.
C2--20 to 26 inches; light brown (7.5YR 6/4) stratified fine sandy loam, brown (7.5YR 5/4) moist; massive; slightly hard, very friable, nonsticky and nonplastic; common fine roots; common fine tubular pores; few very thin strata of silt loam, loam, and clay loam; slightly effervescent; moderately alkaline (pH 8.4); abrupt wavy boundary.
C3--26 to 43 inches; light reddish brown (5YR 6/4) stratified loamy sand, reddish brown (5YR 5/4) moist; massive; slightly hard, very friable, nonsticky and nonplastic; common fine roots; common fine irregular pores; few very thin strata of silt loam, loam, and clay loam; slightly effervescent; moderately alkaline (pH 8.4); abrupt wavy boundary.
C4--43 to 60 inches; light brown (7.5YR 6/4) stratified loamy sand, brown (7.5YR 5/4) moist; massive; slightly hard, very friable, nonsticky and nonplastic; common very fine roots; common fine irregular pores; few very thin strata of very fine sandy loam, fine sandy loam, and silt loam; slightly effervescent; moderately alkaline (pH 8.4). (Combined thickness of the C horizons is 35 to 58 inches)
TYPE LOCATION: Navajo County, Arizona; on the north side of the Little Colorado River and west of the City of Holbrook; 2,100 feet north and 500 feet west of the southeast corner of section 1, T.17 N., R.20 E.
RANGE IN CHARACTERISTICS:
Soil Moisture: Intermittently moist in some part of the soil moisture control section during July-September and December-February. Driest during May and June. Typic aridic soil moisture regime.
Soil Temperature: 51 to 59 degrees F.
Rock Fragments: less than 15 percent gravel
Reaction: Slightly alkaline to strongly alkaline
Calcium carbonate: effervescent from at depth of less than 10 inches to more than 40 inches
Salinity: none to slightly saline
Sodicity: none to slightly sodic
A and C horizons
Hue: 2.5YR, 5YR, 7.5YR, 10YR
Value: 5 to 7 dry, 4 to 6 moist
Chroma: 2 to 6 dry, 2 to 4 moist
Texture: loamy sand, loamy fine sand, fine sand, sand
Stratification: thin strata of sandy loam, fine sandy loam, very fine sandy loam, loam, silt loam
COMPETING SERIES: These are the Baroid (WY) and Beebe (UT) series. Beebe soils have an exchangeable sodium percentage that exceeds 20 percent. Baroid soils have a mean annual soil temperature of 48 to 50 degrees F., and are moist in the moisture control section during May and June.
GEOGRAPHIC SETTING: Trail soils are on floodplains, channels, valley bottoms, low terraces, and alluvial fans and have slopes of 0 to 8 percent. These soils formed in stratified alluvium weathered dominantly from sandstone, siltstone, limestone and mudstone. Elevations range from 3,800 to 6,200 feet. The mean annual precipitation ranges from 6 to 10 inches. The mean annual air temperature is 49 to 57 degrees F. The frost-free period is 115 to 190 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Epikom, Ives, Jocity, and Tours soils. Epikom soils have bedrock at depths less than 20 inches. Ives soils are coarse-loamy. Jocity soils are fine-loamy. Tours soils are fine-silty.
DRAINAGE AND PERMEABILITY: Well drained or somewhat excessively drained; low runoff; moderately rapid to rapid permeability.
USE AND VEGETATION: Trail soils are used for livestock grazing and irrigated cropland. The present vegetation is cottonwood, salt cedar, willow, Russian thistle, camelthorn, fourwing saltbush, and sand dropseed.
DISTRIBUTION AND EXTENT: Northern Arizona, southern Colorado, northern New Mexico and southern Utah. This series is not extensive. MLRA 35 and 36. Use in MLRA 70C is discouraged.
MLRA OFFICE RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Navajo County Soil Survey Area, Arizona; 1961.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from 0 to 3 inches (A horizon)
Entisol feature - The absence of diagnostic subsurface horizons
Classified according to Soil Taxonomy Second Edition, 1999; Keys to Soil Taxonomy Tenth Edition, 2006.
ADDITIONAL DATA: NSSL Sample S77AZ-17-1
Updated and revised for the correlation of Ft. Defiance Area AZ715 2/08 DWD