LOCATION DEJONAH CAEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, active, frigid Andic Haplohumults
TYPICAL PEDON: Dejonah gravelly loam, on a northeast facing 30 percent slope under a cover of mixed conifers, red fir and shrubs at an elevation of 5051 feet, (1540 m). When described on 7/14/99 the soil was dry throughout. (Colors are for dry soil unless otherwise noted)
Oi--0 to 1 inches, (0 to 2.5 cm); fresh needles and twigs. (1 to 4 inches, (2.5 to 10 cm) thick)
A--1 to 4 inches, (2.5 to 10 cm); brown (7.5YR 4/4) gravelly loam, dark reddish brown (5YR 3/3) moist; 14 percent clay; weak fine subangular blocky structure parting to single grain; loose, very friable, nonsticky and nonplastic; many very fine and fine, and common coarse roots; many very fine irregular pores; 20 percent gravel; slightly acid, pH 6.3 by Hellige-Truog; NaF pH 10.5; abrupt smooth boundary. (3 to 7 inches, (8 to 18 cm) thick)
Bt1--4 to 10 inches, (10 to 25 cm); brown (7.5YR 5/4) loam, dark reddish brown (5YR 3/4) moist; 18 percent clay; moderate medium subangular blocky structure; soft, friable, nonsticky and slightly plastic; common very fine to medium roots; few very fine tubular pores; few faint discontinuous clay films on faces of peds; 5 percent gravel; slightly acid, pH 6.5 by Hellige-Truog; NaF pH 9.5; clear smooth boundary. (4 to 8 inches, (10 to 20 cm) thick)
2Bt2--10 to 16 inches, (25 to 41 cm); brown (7.5YR 5/4) loam, brown (7.5YR 4/4) moist; 21 percent clay; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few fine and common medium roots; few very fine tubular pores; few faint discontinuous clay films on faces of peds; 5 percent gravel; slightly acid, pH 6.5 by Hellige-Truog; NaF pH 9.5; clear smooth boundary.
2Bt3--16 to 28 inches, (41 to 71 cm); light brown (7.5YR 6/4) loam, brown (7.5YR 4/4) moist; 22 percent clay; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few fine and coarse, and common medium roots; common very fine and fine tubular pores; few faint discontinuous clay films on faces of peds and in pores; slightly acid, pH 6.5 by Hellige-Truog; NaF pH 9.5; clear smooth boundary.
2Bt4--28 to 37 inches, (71 to 94 cm); light brown (7.5YR 6/4) loam, brown (7.5YR 4/4) moist; 16 percent clay; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few fine and coarse, and common medium roots; many very fine tubular pores; few faint discontinuous clay films on faces of peds and in pores; moderately acid, pH 5.8 by Hellige-Truog; NaF pH 9.0; clear smooth boundary. (Combined thickness of the 2Bt2, 2Bt3, and 2Bt4 horizons is 12 to 61 inches, (30 to 155 cm) thick).
2BC1--37 to 53 inches, (94 to 135 cm); light yellowish brown (10YR 6/4) sandy loam, dark yellowish brown (10YR 4/4) moist; 12 percent clay; weak fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common fine to medium roots; many very fine and fine tubular pores; 30 percent paragravel; moderately acid, pH 5.8 by Hellige-Truog; NaF pH 9.0; clear wavy boundary.
2BC2--53 to 60 inches, (135 to 152 cm); light yellowish brown (10YR 6/4) loam, dark yellowish brown (10YR 4/4) moist; 14 percent clay; moderate fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; few medium roots; many very fine and fine tubular pores; 50 percent paragravel; moderately acid, pH 5.8 by Hellige-Truog; NaF pH 9.0. (Combined thickness of the 2BC horizons is 0 to 28 inches, (0 to 71 cm) thick)
TYPE LOCATION: Plumas County, California; about 1.6 miles northwest of Camel Peak Lookout, approximately 1300 feet west and 2400 feet north of the SE corner of Section 30, Township 22 N., Range 8 E.; 39 degrees, 44 minutes, 11.1 seconds North latitude and 121 degrees, 7 minutes, 24.5 seconds, West longitude, NAD83. U.S.G.S. Quad: American House, California.
RANGE IN CHARACTERISTICS: Depth to paralithic bedrock is greater than 60 inches, (152 cm). The mean annual soil temperature is 40 to 47 degrees F, (4 to 8 degrees C). The soil moisture control section is dry in all parts from about August to about October (about 60 days). The particle-size control section averages 18 to 27 percent clay and 5 to 30 percent rock fragments, mostly gravel. Mineralogy is mixed. Organic matter ranges from 5 to 17 percent to a depth of 4 inches, (10 cm), 2 to 10 percent from 4 to 16 inches, (10 to 41 cm), 1 to 2 percent from 16 to 53 inches, (41 to 135 cm) and is less than 1 percent from 53 to 60 inches, (135 to 152 cm). Base saturation by sum of cations ranges from 10 to 25 percent from 1 to 16 inches, (2.5 to 41 cm) and is less than 10 percent from 16 to 60 inches, (41 to 152 cm). Rock fragments on the surface range from 0 to 10 percent gravel and 0 to 10 percent cobbles. Some pedons have a C horizon.
The A horizon dry color is 7.5YR 5/3, 5/4, 6/3, 6/4 or 7/4. Moist color is 7.5YR 3/2, 4/3, 4/4, 5YR 3/3, 3/4, 4/4 or 4/6. Texture is loam, sandy loam, gravelly loam, gravelly sandy loam or very gravelly sandy loam. Clay content ranges from 10 to 18 percent. Rock fragments range from 5 to 40 percent gravel and 0 to 5 percent cobbles. NaF pH ranges from 10.0 to 11.5. Acid oxalate extractable Al plus 0.5 Fe ranges from 1.4 to 2.0. P retention ranges from 80 to 85. Glass ranges from 5 to 10 percent. Reaction ranges from slightly acid to strongly acid.
The Bt1 horizon dry color is 7.5YR 5/3, 5/4, 6/3, 6/4, 6/6 or 7/6. Moist color is 7.5YR 4/3, 5/4, 5/6, 5YR 3/4, 4/3, 4/6, 5/4 or 5/6. Texture is gravelly loam, gravelly sandy loam or loam. Clay content ranges from 18 to 25 percent. Rock fragments range from 5 to 20 percent gravel and 0 to 5 percent cobbles. NaF pH ranges from 9.5 to 10.5. Acid oxalate extractable Al plus 0.5 Fe ranges from 1.0 to 1.8. P retention ranges from 65 to 85. Glass ranges from 2 to 10 percent. Reaction ranges from slightly acid to very strongly acid.
The 2Bt horizon dry color is 7.5YR 5/4, 6/4, 7/4, 7/6, 10YR 7/4, 7/6, 8/4 or 8/6. Moist color is 7.5YR 4/4, 5/4, 5/6, 6/6, 10YR 4/4, 5/4, 5/6 or 6/6. Texture is loam, gravelly loam, very gravelly loam, gravelly sandy clay loam or very gravelly sandy clay loam. Clay content ranges from 15 to 27 percent. Rock fragments range from 0 to 30 percent gravel, 0 to 15 percent cobbles and 0 to 30 percent paragravel. NaF pH ranges from 9.0 to 10.0. Reaction ranges from slightly acid to very strongly acid.
The 2BC horizon dry color is 10YR 6/4, 7/6 or 8/6. Moist color is 10YR 4/4, 6/6, 7.5YR 6/6 or 6/8. Texture is loam, sandy loam, gravelly loam or extremely gravelly sandy loam. Clay content ranges from 8 to 20 percent. Rock fragments range from 0 to 80 percent gravel, 0 to 20 percent cobbles and 0 to 50 percent paragravel. NaF pH is less than 9.0. Reaction ranges from moderately acid to very strongly acid.
COMPETING SERIES: There are no other series in this family.
GEOGRAPHIC SETTING: Dejonah soils are on ridge tops and side slopes on metamorphic Sierra Nevada mountains. Slopes range from 2 to 70 percent. These soils formed in tephra influenced colluvium and residuum from metamorphic rocks such as metadiorite, metatuff, metadacite, phyllite, quartzite and metamorphosed sodarhyolite. Elevation is 4,800 to 5,900 feet, (1463 to 1798 m). Mean annual precipitation is 75 to 80 inches, (1905 to 2032 mm). The mean annual temperature is 48 to 50 degrees F, (9 to 10 degrees C). Frost free season is 80 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bonepile, Obskel, Obstruction, Powderhouse, and Stagpoint soils. Bonepile soils are on volcanic ridges, are deep to a paralithic contact, are medial over loamy-skeletal and are mesic. Obskel soils are deep to a paralithic contact, are loamy-skeletal and are mesic. Obstruction soils are mesic. Powderhouse soils are moderately deep to a paralithic contact of mudflow and are medial-skeletal. Stagpoint soils are loamy-skeletal.
DRAINAGE AND PERMEABILITY: Well drained; low to medium runoff; moderate to moderately rapid saturated hydraulic conductivity in the A and Bt horizons, moderate in the 2Bt horizon and moderate to moderately rapid in the 2BC horizon.
USE AND VEGETATION: This soil is used for timber production, wildlife habitat and watershed. Vegetation is mainly white fir and California red fir with sugar pine, and minor amounts of ponderosa pine, incense cedar, Douglas-fir and California black oak, and an understory of Sierra chinquapin, whitethorn ceanothus, greenleaf manzanita, bitter cherry, pinemat manzanita, brackenfern, Sierra gooseberry, princes pine, common snowberry, huckleberry oak, Pacific dogwood and pine Indian paintbrush.
DISTRIBUTION AND EXTENT: Plumas and Butte Counties, California. MLRA 22A - Sierra Nevada Range. The soils are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Plumas County, California 2005. Source of name from Dejonah Creek Mine, Dogwood Peak Quadrangle.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - zone from 1 to 10 inches, (2.54 to 25 cm) (A, Bt1)
Argillic horizon - zone from 4 to 37 inches, (10 to 94 cm) (Bt1, 2Bt2, 2Bt3, 2Bt3, 2Bt4,)
Andic materials- zone from 1 to 10 inches, (2.54 to 25 cm) (A, Bt1)
Particle-size control section - zone from 4 to 24 inches, (10 to 61 cm).
The soil moisture control section - zone from 10 to 21 inches, (25 to 53 cm).
Bulk density is assumed to be 1 or less from 1 to 10 inches, (2.54 to 25 cm).
ADDITIONAL DATA: Used data from nearby profile S98CA-007-002, NSSL, Lincoln, NE.