LOCATION TENDERFOOT AZEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic, shallow Calcic Paleargids
TYPICAL PEDON: Tenderfoot very gravelly loam - rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 3 inches; reddish brown (5YR 5/4) very gravelly loam, reddish brown (5YR 4/4) moist; moderate fine granular structure; soft, very friable, slightly sticky and plastic; many very fine roots; many very fine vesicular and irregular pores; surface lag of 35 percent chert and limestone gravel; noneffervescent; neutral (pH 6.9); abrupt smooth boundary. (1 to 3 inches thick)
Bt--3 to 9 inches; yellowish red (5YR 4/6) clay loam, reddish brown (5YR 4/4) moist; strong coarse subangular blocky structure; hard, friable, sticky and plastic; many very fine roots; many very fine tubular pores; 10 percent chert and limestone gravel; few faint clay films on faces of peds and lining pores; noneffervescent; neutral (pH 6.9); abrupt wavy boundary. (4 to 9 inches thick)
Bk--9 to 17 inches; reddish brown (5YR 4/4) extremely cobbly clay loam, reddish brown (5YR 4/3) moist; moderate fine subangular blocky structure; slightly hard, friable, sticky and slightly plastic; common very fine roots; few very fine tubular pores; 40 percent cobble and 25 percent gravel of calcium carbonate-coated limestone and hardpan fragments; slightly effervescent in the fine earth and strongly effervescent on coatings; neutral (pH 7.0); abrupt wavy boundary (7 to 9 inches thick)
Bkm--17 to 23 inches; indurated, calcium carbonate-cemented hardpan.
R--23 inches; limestone.
TYPE LOCATION: Coconino County, Arizona; on the Havasupai Indian Reservation; 2100 feet west and 1600 feet north of the southeast corner of Section 9, T. 32 N., R. 5 W.
RANGE IN CHARACTERISTICS:
Soil Moisture: Moist in some part of the soil moisture control section during December - March and intermittently moist during July-September. Driest during May and June. Ustic aridic soil moisture regime.
Soil Temperature: 54 to 57 degrees F.
Rock Fragments: 35 to 65 percent gravel and cobble. A gravelly to extremely gravelly surface lag layer is common.
Depth to Petrocalcic horizon: Dominantly 14 to 20 inches, but ranges from 10 to 20 inches
Depth to bedrock: 16 to 40 inches
Calcium carbonate equivalent: Less than 30 percent above the hardpan
Organic matter: Averages more than 1 percent in the surface
A horizon
Hue: 5YR, 7.5YR
Value: 4 or 5 dry, 3 or 4 moist
Chroma: 4 or 5 dry, 3 or 4 moist
Bt horizon
Hue: 5YR, 7.5YR
Value: 4 or 5 dry, 3 or 4 moist
Chroma: 3, 4 or 6, dry or moist
Texture: Clay loam, loam, sandy clay loam
Reaction: Neutral or slightly alkaline
Bk horizon
Hue: 5YR, 7.5YR
Value; 4, 5 or 6 dry, 3 or 4 moist
Chroma: 4 dry, 3 or 4 moist
Texture: Clay loam, loam, sandy clay loam, fine sandy loam
Reaction: Neutral or slightly alkaline
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Tenderfoot soils are on plateaus and mesas at elevations of 5700 to 6100 feet. They formed in alluvium derived from cherty limestone. Slopes range from 1 to 8 percent. The mean annual precipitation is 10 to 12 inches. The mean annual air temperature is 52 to 55 degrees F. The frost-free period is 135 to 175 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Havasupai and Winona soils. Havasupai and Winona soils do not have argillic horizons.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderately slow permeability.
USE AND VEGETATION: Tenderfoot soils are used for wildlife habitat, recreation and livestock grazing. Present vegetation is Wyoming big sagebrush, blue grama, and bottlebrush squirreltail.
DISTRIBUTION AND EXTENT: Northwestern Arizona. This series is of moderate extent. MLRA is 35.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona.
SERIES ESTABLISHED: Coconino County, Arizona; Soil survey of Hualapai-Havasupai Area, Parts of Coconino, Mohave and Yavapai Counties; 1993.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from 0 to 3 inches (A horizon)
Argillic horizon - The zone from 3 to 9 inches (Bt horizon)
Petrocalcic horizon - The zone from 17 to 23 inches (Bkm horizon)
Lithic contact - The boundary at 23 inches (R horizon)
Classified according to Soil Taxonomy, Second Edition, 1999; Keys to Soil Taxonomy Tenth Edition, 2006.
ADDITIONAL DATA: Laboratory analysis by BIA Natural Resources Laboratory in Gallup, New Mexico.