LOCATION MAGGIB WA

Established Series
Rev. CAB/SBC
06/2011

MAGGIB SERIES

The Maggib series consists of moderately deep, well drained soils formed in volcanic ash and glacial drift on valley walls, bedrock benches, and passes. Slopes are 0 to 15 percent on passes and bedrock benches, and 15 to 65 percent on valley walls. The mean annual precipitation is about 1,800 millimeters. The mean annual temperature is about 3 degrees C.

TAXONOMIC CLASS: Medial over sandy or sandy-skeletal, amorphic over isotic Andic Haplocryods

TYPICAL PEDON: Maggib stony medial fine sandy loam, on a valley wall landform with a NNW facing slope of 20 percent at 1950 meters elevation under coniferous forest vegetation. When described on September 17, 2007 the soil was dry throughout. (Colors are for moist soil unless otherwise noted.)

Oe--0 to 2 centimeters; moderately decomposed plant material; many very fine and common fine roots; abrupt smooth boundary.

Oa--2 to 5 cm; highly decomposed plant material; many very fine and fine, few medium and coarse roots; abrupt smooth boundary.

E--5 to 9 cm; very dark gray (10YR 3/1) stony medial fine sandy loam, gray (10YR 6/1), dry; weak fine subangular blocky structure; soft, very friable, nonsticky, nonplastic; few very fine and fine roots and common medium and coarse roots; 5 percent medium and coarse gravel, 5 percent cobbles, and 5 percent stones; extremely acid (pH 4.4); clear irregular boundary.

Bs1--9 to 27 cm; strong brown (7.5YR 4/6) gravelly medial fine sandy loam, reddish yellow (7.5YR 7/6), dry; weak fine subangular blocky structure; soft, very friable, nonsticky, nonplastic; common very fine, fine, medium, coarse, and very coarse roots; 5 percent fine gravel, 10 percent medium and coarse gravel, and 5 percent cobbles; strongly acid (pH 5.2); clear wavy boundary.

Bs2--27 to 64 cm; dark brown (7.5YR 3/4) gravelly medial sandy loam, strong brown (7.5YR 5/6), dry; weak fine subangular blocky structure; soft, very friable, nonsticky, nonplastic; common very fine, fine, and medium roots and few coarse roots; 5 percent fine gravel, 20 percent medium and coarse gravel, and 5 percent cobbles; strongly acid (pH 5.4); clear wavy boundary.

2BC--64 to 80 cm; dark yellowish brown (10YR 3/4) extremely cobbly loamy sand, yellowish brown (10YR 5/4), dry; single grain; loose, nonsticky, nonplastic; few very fine and fine and common medium and coarse roots; 15 percent fine gravel, 30 percent medium and coarse gravel, and 35 percent cobbles; moderately acid (pH 5.8); abrupt wavy boundary.

R--80 cm; orthogneiss bedrock.

TYPE LOCATION: North Cascades National Park, Chelan County, Washington; 507 meters west and 669 meters south of NE corner of Section 31, T34N, R18E Willamette Meridian; McAlester Mountain, Washington USGS quadrangle; 48 degrees 24 minutes 18 seconds north latitude, 120 degrees 39 minute 9 seconds west longitude; NAD83; UTM 673737 meters E, 5362975 meters N, zone 10N.

RANGE IN CHARACTERISTICS:
Mean annual soil temperature: 1 to 6 degrees C. Cryic soil temperature regime.
Soil moisture control section: dry for less than 30 consecutive days from June to October. Udic soil moisture regime.
Thickness of volcanic ash mantle: 35 to 90 centimeters
Depth to bedrock (lithic contact): 50 to 100 cm from the mineral surface
The particle-size control section in this soil is contrasting. Most characteristics are listed by horizon.

E horizon:
Hue - 7.5YR or 10YR
Value - 3 to 5 moist, 5 to 7 dry
Chroma - 1 or 2 moist or dry
Fine earth texture - medial FSL, medial SL, or ashy LS
Rock fragments - 0 to 30 percent total
0 to 15 percent gravel
0 to 15 percent cobbles
0 to 10 percent stones
Clay content - 1 to 6 percent
Volcanic glass - 15 to 50 percent
Reaction - extremely acid to strongly acid
Thickness - 2 to 10 centimeters

Bhs horizons are sometimes present with thickness ranging from 1 to 9 centimeters, textures of medialSL or medial FSL, reaction of very strongly acid or strongly acid, hue of 7.5 YR or 5 YR, moist value of 2 to 4, and moist chroma of 3 or 4.

Bs horizons:
Hue - 5 YR or 7.5YR
Value - 3 to 5 moist, 5 to 7 dry
Chroma - 2 to 6 moist or dry
Fine earth texture - medial FSL, medial SL or medial L
Rock fragments - 5 to 35 percent total
5 to 25 percent gravel
0 to 10 percent cobbles
0 to 10 percent stones
Clay content - 3 to 10 percent
Volcanic glass - 15 to 50 percent
Reaction - strongly acid to moderately acid
Thickness - 33 to 65 centimeters

2BC horizons:
Hue -10YR or 2.5Y
Value - 3 to 5 moist, 4 to 6 moist
Chroma - 3 to 5 moist or dry
Fine earth texture - SL, LS, or LCOS in the upper part
LS or LCOS in the lower part
Rock fragments - 35 to 80 percent total
25 to 45 percent gravel
10 to 35 percent cobbles
0 to 10 percent stones
Clay content - 1 to 8 percent
Volcanic glass - 5 to 15 percent
Reaction - strongly acid to slightly acid
Thickness - 15 to 65 centimeters

COMPETING SERIES: These are the Altapeak, Chilliwack (T), Index, Shoestring, Skippeak, and Thetis soils. Altapeak soils are ashy-skeletal in the upper part of the particle-size control section and have a paralithic contact at 100 to 150 cm. Chilliwack soils are very deep to bedrock. Index soils are ashy-skeletal in the upper part of the particle-size control section and have a paralithic contact at 100 to 180 cm. Shoestring soils are very deep to bedrock, have amorphic over mixed mineralogy, and are formed in multiple layers of aerially deposited volcanic ash and pumice, with parts of the spodic horizon containing 30 to 45 percent pumice. Skippeak soils are very deep to bedrock and are ashy-skeletal in the upper part of the particle-size control section. Thetis soils are very deep to bedrock and are ashy-skeletal in the upper part of the particle-size control section.

GEOGRAPHIC SETTING: The Maggib soils are on valley walls, bedrock benches, and passes at elevations of 1,100 to 2,000 meters. Slopes are 0 to 65 percent. These soils formed in volcanic ash and glacial drift. The climate consists of cool, dry summers and cold, wet winters. Mean annual precipitation ranges from 1,800 to 3,300 millimeters, and mean annual air temperature ranges from 1 to 6 degrees C. Frost-free season is 30 to 60 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Chilliwack(T), Spickard (T), and Treen soils. Treen soils are found on the same landforms, are shallow to a lithic contact, and lack spodic horizons. Spickard soils form on the same stable portions of valley walls, are very deep to bedrock, and lack spodic horizons. Chilliwack soils are found on valley walls and bedrock benches and are very deep to bedrock.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; high to very high saturated hydraulic conductivity.

USE AND VEGETATION: Used for watershed, recreation, woodland, and wildlife habitat. Potential natural vegetation consists of Pacific silver fir, mountain hemlock, and subalpine fir with an understory of pink mountain heather and Cascade huckleberry.

DISTRIBUTION AND EXTENT: Western slopes of the North Cascade Mountains, Washington. MLRA 3. Series is of moderate extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: North Cascades National Park Service Complex, 2011.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: 25 to 80 centimeters from the mineral surface
Ochric epipedon: 0 to 18 centimeters (Oe, Oa, E, and upper 9 centimeters of the Bs1 horizons)
Albic horizon: 5 to 9 centimeters (E horizon)
Spodic horizon: 9 to 64 centimeters (Bs1 and Bs2 horizons)
Andic soil properties: 5 to 64 centimeters (E, Bs1, and Bs2 horizons)
Lithologic discontinuity: 64 centimeters
Lithic contact: 80 centimeters

When chroma of the spodic horizon is 6, it still meets spodic material criteria 2.b.(3) (Keys to Soil Taxonomy, Version 10, page 20). Laboratory data from the geographically associated Chilliwack series (lab pedon number 06N0802) indicate that ammonium oxalate extractable aluminum + 1/2 iron in the Bs (spodic) horizon is greater than 1.0 percent, and the overlying albic horizon is less than 0.2 percent.

National Cooperative Soil Survey
U.S.A.