LOCATION BLEUMONT AZEstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Aridic Paleustalfs
TYPICAL PEDON: Bleumont extremely cobbly fine sandy loam - woodland. (Colors are for dry soil unless otherwise noted.)
A--0 to 2 inches; brown (10YR 4/3) extremely cobbly fine sandy loam, very dark brown (10YR 2/2) moist; weak thin platy structure parting to moderate fine granular; soft, very friable, nonsticky and nonplastic; few very fine roots; common very fine irregular pores; 25 percent cobble, 35 percent gravel, and 5 percent stones; noneffervescent; slightly alkaline (pH 7.5); abrupt smooth boundary. (2 to 4 inches thick)
AB--2 to 4 inches; dark brown (10YR 3/3) very gravelly sandy clay loam, very dark brown (10YR 2/2) moist; weak medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; common very fine and few fine roots; common very fine tubular pores; 35 percent gravel; noneffervescent; slightly alkaline (pH 7.5); abrupt smooth boundary. (0 to 3 inches thick)
Bt--4 to 12 inches; yellowish red (5YR 5/6) clay, yellowish red (5YR 4/6) moist; moderate coarse subangular blocky structure; hard, firm, very sticky and very plastic; common very fine, few fine and medium roots; few very fine tubular pores; common distinct clay films on ped faces and few faint clay films in pores; noneffervescent; slightly alkaline (pH 7.7); abrupt wavy boundary. (6 to 10 inches thick)
Btk1--12 to 21 inches; variegated yellowish red (5YR 4/6) and yellowish red (5YR 5/6) and dark brown (10YR 3/3) sandy clay, yellowish red (5YR 4/6), strong brown (7.5YR 4/6) and dark brown (10YR 3/3), , and moist; strong coarse prismatic structure; hard, firm, sticky and plastic; few fine, medium and coarse roots; few very fine tubular pores; many distinct clay films in pores and on ped faces; few thin soft filaments of calcium carbonate; noneffervescent matrix and slightly effervescent concentrations; slightly alkaline (pH 7.8); abrupt wavy boundary. (8 to 12 inches thick)
2Btk2--21 to 34 inches; variegated yellowish red (5YR 4/6) and yellowish red (5YR 5/6), and very pale brown (10YR 8/3) very cobbly sandy clay, yellowish red (5YR 4/6) and reddish yellow (7.5YR 7/6) moist; moderate coarse subangular blocky structure; very hard, firm, sticky and plastic; few very fine roots; few very fine tubular pores; 25 percent gravel and 30 percent cobble, of which one-tenth are saprolite; common faint clay films on ped faces; common medium and coarse soft masses of calcium carbonate and many coatings under rock fragments; noneffervescent matrix with violently effervescent concentrations; slightly alkaline (pH 7.8); abrupt wavy boundary. (12 to 20 inches thick)
2Btk3--34 to 62 inches; variegated reddish yellow (7.5YR 6/8) and pink (7.5YR 7/4), , and pink (7.5YR 8/4) extremely cobbly sandy clay loam, strong brown (7.5YR 5/6) and reddish yellow (7.5YR 7/6) moist; massive; hard, firm, slightly sticky and slightly plastic; few very fine roots; few very fine tubular pores; 35 percent cobble, 10 percent gravel, and 20 percent stones, of which 20 percent are saprolite; few faint clay films in pores and on ped faces; weakly cemented with calcium carbonate; violently effervescent; moderately alkaline (pH 8.0).
TYPE LOCATION: Coconino County, Arizona; on the Hualapai Indian Reservation; 1650 feet east and 950 feet north of the southwest corner of section 19, T.26 N., R.8 W.; about 1 1/2 miles northeast of Blue Mountain.
RANGE IN CHARACTERISTICS:
Soil Moisture: Moist in some part of the soil moisture control section during December - February and intermittently moist during July - September. Driest during May and June. Aridic ustic soil moisture regime.
Soil Temperature: 54 to 56 degrees F.
Rock Fragments: less than 35 percent in the control section
Clay content: 35 to 55 percent in the control section
Depth to calcic horizon: 20 to 40 inches
Calcium carbonate equivalent: 2 to 20 percent in the upper Btk horizons and 20 to 35 percent in the calcic horizon
A horizon
Hue: 5YR to 10YR
Value: 4 or 5 dry, 2 to 4 moist
Chroma: 3 or 4, dry or moist
Rock fragments: lag layer consisting of 30 to 65 percent gravel and 25 to 40 percent cobble
The AB horizon is not present in some pedons
Bt horizon
Hue: 5YR, 7.5YR
Value: 4 or 5 dry, 3 or 4 moist
Chroma: 4 to 6, dry or moist
Texture: clay, sandy clay. (15 percent or more (absolute) clay increase at the upper boundary within a vertical distance of 1 inch)
2Btk horizon
Hue: 5YR, 7.5YR
Value: 4 to 8 dry, 4 to 7 moist
Chroma: 3 to 6, dry or moist
Texture: sandy clay loam, sandy clay
Rock fragments: 35 to 70 percent, dominantly cobble
COMPETING SERIES: These are the Brislawn (WY), Jaywest (WY), Spottedhorse (WY), series. Brislawn soils have fragmental material consisting of porcelanite at depths of 20 to 40 inches. Jaywest soils rock fragment content typically averages less than 5 percent channers throughout but ranges from 0 to 15 percent channers. Spottedhorse soils are moderately deep. In addition, Brislawn, Jaywest, Spottedhorse soils are in LRR-G and are more moist in May and June.
GEOGRAPHIC SETTING: Bleumont soils are on terrace treads and scarps of fan terraces at elevations of 5500 to 5900 feet. These soils formed in alluvium derived dominantly from igneous and sedimentary rocks. Slope ranges from 2 to 20 percent. The mean annual precipitation is 14 to 16 inches. The mean annual air temperature is 52 to 54 degrees F. The frost-free period is 120 to 160 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Buckndoe, Metuck, and Milkweed series. Buckndoe soils have a loamy-skeletal control section. Metuck soils do not have argillic horizons and are shallow to bedrock. Milkweed soils are loamy-skeletal and are shallow to a calcium carbonate cemented hardpan.
DRAINAGE AND PERMEABILITY: Well drained; rapid runoff; slow permeability.
USE AND VEGETATION: Bleumont soils are used for grazeable woodland, firewood gathering, and wildlife habitat. The present vegetation is twoleaf pinyon, Utah juniper, turbinella oak, blue grama, banana yucca, and desert ceanothus.
DISTRIBUTION AND EXTENT: Northern Arizona. This series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Coconino County, Arizona; Hualapai Indian Reservation; 1993.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from 0 to 4 inches (A, AB horizons)
Argillic horizon - The zone from 4 to 62 inches (Bt, Btk1, 2Btk2, 2Btk3 horizons)
Calcic horizon - The zone from 34 to 62 inches (2Btk3 horizon)
Classified according to Keys to Soil Taxonomy Ninth Edition, 2003.