LOCATION DANHUNT            CA
Established Series
Rev. DWB/CAF/JJJ/CEJ
10/97

DANHUNT SERIES


The Danhunt series consists of very deep, well drained soils formed in tephra. Danhunt soils are on mountains. Slopes range from 15 to 75 percent. The mean annual precipitation is about 40 inches and the mean annual temperature is about 40 degrees F.

TAXONOMIC CLASS: Medial-skeletal, mixed, frigid Typic Vitrixerands

TYPICAL PEDON: Danhunt gravelly sandy loam on a north facing 52 percent slope under a cover of mixed conifers at an elevation of 5,240 feet. (Colors are for dry soil unless, otherwise stated. When described July 9, 1987, the soil was dry throughout).

Oi--3 to 0 inches; recent and decomposed litter.

A--0 to 2 inches; brown (10YR 5/3) gravelly sandy loam, very dark brown (10YR 2/2) moist; weak very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine roots; common very fine interstitial pores; 25 percent andesitic gravel; NaF pH 11.5; moderately acid (pH 6.0); abrupt wavy boundary. (2 to 6 inches thick).

Bw1--2 to 11 inches; pale brown (10YR 6/3) gravelly coarse sandy loam, dark yellowish brown (10YR 4/4) moist; weak very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine and few fine and medium roots; common very fine interstitial pores; 25 percent andesitic gravel; NaF pH 11.5; slightly acid (pH 6.2); clear smooth boundary. (9 to 14 inches thick)

Bw2--11 to 22 inches; pale brown (10YR 6/3) very gravelly coarse sandy loam, dark yellowish brown (10YR 4/4) moist; weak very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common fine and few medium and coarse roots; common very fine interstitial pores; 40 percent andesitic gravel; NaF pH 11.0; moderately acid (pH 6.0); gradual smooth boundary. (11 to 16 inches thick)

Bw3--22 to 38 inches; pale brown (10YR 6/3) very gravelly loamy coarse sand, brown to dark brown (10YR 4/3) moist; weak very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common fine and few medium and coarse roots; common very fine interstitial pores; 50 percent andesitic gravel; NaF pH 10.5; moderately acid (pH 5.8); gradual smooth boundary. (9 to 16 inches thick).

C--38 to 61 inches; light gray (10YR 7/2) extremely gravelly coarse sandy loam, grayish brown (10YR 5/2) moist; massive; loose, nonsticky and nonplastic; few fine and few medium and coarse roots; common very fine interstitial pores; 70 percent andesitic gravel; NaF pH 10.5; moderately acid (pH 5.7); (13 to 20 inches thick).

Cr--61 to 70 inches; soft weathered andesitic porphyry.

TYPE LOCATION: Shasta County, California; about 9 miles southwest of Burney on Danhunt Mtn.; northeast corner of sec. 34, T. 34 N., R. 2 E., Burney SW (Burney Mtn West) quadrangle (7.5 minute series).

RANGE IN CHARACTERISTICS: Depth to a paralithic contact is greater than 60 inches. The mean annual soil temperature is 41 to 45 degrees F. The soil temperature exceeds 41 degrees F. from mid May to mid November and exceeds 47 degrees F. from early July to early October. The soil moisture control section is dry in all parts from mid July to early October (60 to 90 days) and is moist in all parts from early November to mid June.

The A horizon color is 10YR 5/2 or 5/3. Moist color is 10YR 2/2, 3/2, 3/3; or 7.5YR 3/2. Organic matter ranges from 5 to 10 percent. Clay content ranges from 1 to 3 percent. Rock fragments, mostly gravel range from 15 to 35 percent. NaF pH is 10.5 to 11.5. Base saturation by ammonium acetate ranges from 10 to 20 percent. Reaction is slightly acid to moderately acid. Bulk density is 0.5 to 0.65.

The Bw horizon color is 10YR 6/3, 6/4, 7/2, 7/3; 7.5YR 6/4 or 7/3. Moist color is 10YR 4/4; 7.5YR 4/4, 5/4, or 5/6. Organic matter ranges from 1 to 5 percent. Texture is sandy loam or coarse sandy loam modified by 15 to 35 percent coarse fragments in the upper part and 35 to 60 percent in the lower part. Clay content ranges from 3 to 8 percent. NaF pH is 10.0 to 11.5. Base saturation by ammonium acetate ranges from 5 to 10 percent. Bulk density is 0.5 to 0.85.

The C horizon color is 10YR 6/3, 6/4, 7/2, or 7/3. Moist color is 10YR 4/3, 4/4, 5/2, 5/4; 7.5YR 4/4, or 5/4. Texture is very gravelly loamy coarse sand, extremely gravelly coarse sandy loam, or extremely gravelly loamy coarse sand. Clay content ranges from 3 to 8 percent. Rock fragments, mostly gravel and cobbles range from 35 to 90 percent. NaF pH is 10.0 to 10.5. Base saturation by ammonium acetate ranges from 5 to 10 percent. Reaction is slightly acid to strongly acid and decreases with depth.

Some pedons have cemented cinder lenses and may lack a paralithic contact.

Andic property data (see remarks for explanation): Depth P-ret B.D. pH NaF Glass Alo Feo 15 barH20 0-2 95 0.63 ND ND 5.05 0.41 15.0 2-11 94 0.73 ND ND 4.46 0.04 13.7 11-22 90 0.87 ND ND 3.91 0.26 14.0 22-38 85 NC ND ND 3.20 0.14 13.2 38-61 85 NC ND
ND 2.80 0.11 15.8

COMPETING SERIES: This is the Rivalier (T CA) and Twinbuttes (T CA) series. Rivalier soils are 20 to 40 inches deep. Twinbuttes soils have greater than 60 percent cinders throughout.

GEOGRAPHIC SETTING: Danhunt soils are on mountains. Slopes are 15 to 75 percent. These soils formed in tephra. Elevation is 4,700 to 6,200 feet. The climate is subhumid with warm dry summers and cold moist winters. Mean annual precipitation is 35 to 50 inches. Snowfall is 72 to 96 inches. The mean annual temperature is 39 to 41 degrees F. The mean January temperature is about 25 degrees F. The mean July temperature is about 55 degrees F. Frost-free period is 50 to 80 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Goulder (T) and Stacher (T) soils. Goulder soils are on hills, have argillic horizons, have andic properties to 17 inches, and have 5YR colors. Stacher soils are on mountains, have up to 25 percent clay in the control section, have andic properties to 14 inches.

DRAINAGE AND PERMEABILITY: Well drained; medium to very rapid runoff; moderately rapid permeability.

USE AND VEGETATION: This soil is used for timber production. The vegetation is white fir, California red fir, sugar pine, ponderosa pine, Douglas fir, Sierra chinkapin, Pacific dogwood, greenleaf manzanita, princes pine, snowbrush ceanothus, rose and sierra gooseberry.

DISTRIBUTION AND EXTENT: Northeastern California. The soils are not extensive, about 2500 acres. MLRA is 22.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California

SERIES ESTABLISHED: Shasta County, Intermountain Soil Survey Area, California 1994. Source of name is from Danhunt mountain.

REMARKS: Diagnostic horizons and features recognized in this pedon are:

Ochric epipedon- the zone from the soil surface to 2 inches (A).

Cambic horizon- the zone from 2 to 38 inches (Bw1, Bw2, Bw3).

Andic properties data definitions:

P-ret: phosphate retention of the less than 2mm fraction.

B.D.: bulk density of the less than 2mm fraction on an oven dry basis.

pH NaF: pH of soil mixed with saturated sodium floride solution.

Glass: percent volcanic glass.

Alo: acid-oxalate-extractable aluminum of the less than 2mm fraction.

Feo: acid-oxalate-extractable iron of the less than 2mm fraction.

15 bar H20: dried 1500 kPa water retention as a percent.

Data elements with a * are estimated.

NC: not calculated.

ND: not done.

ADDITIONAL DATA: This pedon was characterized by U.C. Davis in 1988. Sample number is CA87-089-7-(1-6), lab no. 1681 unpublished.


National Cooperative Soil Survey
U.S.A.