LOCATION VANTRUMP WA
Established Series
IRD. SMB/PHR/MPR
07/2017
VANTRUMP SERIES
Landscape--Cascade Mountains
Landform--swales, terraces, debris aprons, glacial valley walls
Slope--0 to 35 percent
Parent material--volcanic ash over colluvium derived from andesite
Mean annual precipitation--about 2000 mm
Mean annual air temperature--about 5 degrees C
Depth class--very deep
Drainage class--somewhat poorly drained
Soil moisture regime--aquic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Ashy, amorphic, acid Typic Cryaquands
TYPICAL PEDON: Vantrump ashy sandy loam on a southeast-facing, forested terrace with a slope of 10 percent and at an elevation of 690 m (When described on June 11, 2013, the soil was moist throughout.)
Oi--0 to 2 cm; slightly decomposed plant material; very strongly acid (pH 4.5); clear wavy boundary
Oe--2 to 5 cm; moderately decomposed plant material; common very fine and few fine to coarse roots; very strongly acid (pH 4.5); clear wavy boundary
A--5 to 25 cm; ashy sandy loam, gray (10YR 5/1) dry, very dark gray (10YR 3/1) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine and few fine to coarse roots; common very fine and fine interstitial pores; strongly acid (pH 5.2); abrupt wavy boundary
Bg1--25 to 49 cm; ashy sandy loam, light yellowish brown (10YR 6/4) dry, dark yellowish brown (10YR 4/4) moist; moderate medium subangular blocky structure; moderately hard, firm, nonsticky and nonplastic; common very fine and few fine to coarse roots; common very fine and fine interstitial pores; 5 percent dark reddish brown (5YR 3/4) masses of oxidized iron with diffuse boundaries along root channels and 5 percent gray (10YR 5/1) iron depletions in matrix; strongly acid (pH 5.2); clear wavy boundary
Bg2--49 to 71 cm; paragravelly ashy sandy loam, light yellowish brown (10YR 6/4) dry, dark yellowish brown (10YR 4/4) moist; moderate medium subangular blocky structure; moderately hard, firm, nonsticky and nonplastic; few very fine and fine roots; common very fine and fine interstitial pores; 10 percent dark reddish brown (5YR 3/4) masses of oxidized iron with diffuse boundaries along root channels and 15 percent dark grayish brown (10YR 4/2) iron depletions in matrix; 5 percent fine pumice paragravel; strongly acid (pH 5.2); abrupt wavy boundary
Bg3--71 to 80 cm; ashy fine sandy loam, light yellowish brown (10YR 6/4) dry, dark yellowish brown (10YR 4/4) moist; moderate fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; few very fine roots; common very fine and fine interstitial pores; 2 percent masses of oxidized iron, dark reddish brown (5YR 3/4) moist, along root channels and 10 percent masses of reduced iron, dark gray (10YR 4/1) moist, in matrix; 5 percent fine pumice paragravel; strongly acid (pH 5.2); abrupt smooth boundary
2Bg4--80 to 101 cm; very gravelly ashy loamy coarse sand, light yellowish brown (10YR 6/4) dry, dark yellowish brown (10YR 4/4) moist; moderate fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; few very fine roots; common very fine and fine interstitial pores; 2 percent dark reddish brown (5YR 3/4) masses of oxidized iron with diffuse boundaries along root channels and 5 percent dark gray (10YR 4/1) iron depletions in matrix; 15 percent fine andesite gravel, 15 percent medium and coarse andesite gravel, and 5 percent andesite cobbles; strongly acid (pH 5.4); clear wavy boundary
2Bg5--101 to 150 cm; very gravelly ashy sandy loam, pale brown (10YR 6/3) dry, brown (10YR 4/3) moist; moderate fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; few very fine roots; common very fine and fine interstitial pores; 2 percent dark reddish brown (5YR 3/4) masses of oxidized iron with diffuse boundaries along root channels and 10 percent gray (10YR 5/1) iron depletions in matrix; 15 percent fine andesite gravel, 15 percent medium and coarse andesite gravel, and 5 percent andesite cobbles; strongly acid (pH 5.4)
TYPE LOCATION: Lewis County, Washington, along the east bank of the Muddy Fork of the Cowlitz River, north of Box Canyon overlook in Mount Rainier National Park; about 340 m north and 215 m west of the southeast corner of section 23, T. 15 N., R. 9 E., Willamette Meridian; Mount Rainier East, Washington, U.S. Geological Survey quadrangle; latitude 46.773043 degrees north, longitude -121.637476 degrees west, datum WGS 84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--4 to 8 degrees C
Depth to redoximorphic iron depletions--25 to 50 cm below the soil surface
All mineral horizons
*Volcanic glass content--50 to 75 percent
*Ammonium oxalate Al plus 1/2 Fe--greater than 0.4 percent
Particle-size control section
*Clay content--1 to 7 percent
*Pararock and rock fragment content--0 to 35 percent total, with pumice paragravel typically in upper part of profile and andesite cobbles and stones in lower part in some areas
O horizon
*In lieu of texture--slightly decomposed plant material, moderately decomposed plant material
*Thickness--5 to 14 cm
A horizon
*Hue--10YR, 7.5YR
*Value--1 to 3 moist, 3 to 5 dry
*Chroma--1 to 3 moist or dry
*Reaction--4.5 to 5.5
*Fine-earth texture--ashy sandy loam, ashy loamy sand
*Pararock and rock fragment content--0 to 15 percent total, including 0 to 15 percent pumice paragravel and 0 to 10 percent andesite gravel
*Thickness--20 to 35 cm
Bg1 and Bg2 horizons
*Hue--10YR, 7.5YR
*Value--2.5 to 5 moist, 4 to 7 dry
*Chroma--1 to 4 moist or dry
*Reaction--5.1 to 5.5
*Fine-earth texture--ashy sandy loam, ashy loamy sand, ashy coarse sandy loam
*Pararock and rock fragment content--0 to 25 percent total, including 0 to 25 percent pumice paragravel and 0 to 10 percent andesite gravel
*Combined thickness--40 to 60 cm
Bg3 horizon
*Hue--10YR, 7.5YR
*Value--2.5 to 5 moist, 4 to 7 dry
*Chroma--1 to 4 moist or dry
*Reaction--5.1 to 5.5
*Fine-earth texture--ashy fine sandy loam, ashy loamy sand, ashy sandy loam
*Pararock and rock fragment content--0 to 25 percent total, including 0 to 25 percent pumice paragravel and 0 to 10 percent andesite gravel
*Thickness--5 to 25 cm
2Bg4 and 2Bg5 horizons
*Hue--10YR, 7.5YR
*Value--2.5 to 5 moist, 4 to 7 dry
*Chroma--1 to 4 moist or dry
*Reaction--5.1 to 5.5
*Fine-earth texture--ashy loamy coarse sand, ashy sandy loam, ashy loamy sand
*Rock fragment content--15 to 45 percent total, including 15 to 45 percent andesite gravel and 0 to 15 percent andesite cobbles
*Combined thickness--60 to 80 cm
COMPETING SERIES:
Frogheaven--aquic conditions within 25 cm of the soil surface
GEOGRAPHIC SETTING:
Elevation--650 to 1500 m
Climate--cool, dry summers; cold, wet winters
Mean annual precipitation--1600 to 2700 mm
Mean annual air temperature--3 to 7 degrees C
Frost-free period--60 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Frogheaven--aquic conditions within 25 cm of the soil surface; in similar landform positions
Ghost--organic parent material; aquic conditions within 25 cm of the soil surface; in similar low-lying landform positions; no coniferous overstory
Laughingwater--aquic conditions within 50 to 100 cm of the soil surface; in similar landform positions
Ohanapecosh--lithic contact at a depth of 25 to 50 cm (shallow); in steeper adjacent bedrock-controlled landform positions
Arahustan--lithic contact at a depth of 50 to 100 cm (moderately deep); in steeper adjacent bedrock-controlled landform positions
Longmire--no aquic conditions; albic and spodic horizons; in similar landform positions
Summerland--greater than 35 percent rock fragments in particle-size control section; in active avalanche paths with deciduous forests
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--somewhat poorly drained
Saturation in normal years--below 25 to 80 cm in March through June, below 100 to 180 cm in July through February
Saturated hydraulic conductivity (Ksat)--high or very high throughout
USE AND VEGETATION:
Use--wildlife habitat, recreation
Potential natural vegetation--Pacific silver fir, noble fir, Engelmann spruce, Douglas-fir, western hemlock, western redcedar, red alder, vine maple, thimbleberry, devils club, salmonberry, deer fern, western swordfern, oakfern, twinflower
DISTRIBUTION AND EXTENT: Central Cascade Mountains, Washington; MLRA 3; small extent
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Mount Rainier National Park, Lewis County, Washington; 2014; name from Van Trump Glaciers in Mount Rainier National Park
REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 5 to 105 cm
*Ochric epipedon
*Cambic horizon--zone from 25 to 80 cm and from 101 to 150 cm
*Andic soil properties--zone from 5 to 150 cm
*Volcanic glass--zone from 5 to 150
*Depth to lithologic discontinuity--80 cm
*Redoximorphic iron concentrations--zone from 25 to 150 cm
*Redoximorphic iron depletions with chroma of 2 or less--zone from 25 to 150 cm
*Distinguishable tephra layers--Mount St. Helens Wn tephra (A horizon), Mount St. Helens Yn tephra (Bg1 and Bg2 horizons)
3/2017--This official series description was updated according to SSR1 Technical Note 11--Content and Format of Official Series Descriptions (revised 12/2015). Most of the changes were in formatting; no major technical changes were made.
National Cooperative Soil Survey
U.S.A.